4.7 Review

Recent progress in organic solar cells (Part I material science)

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Article Chemistry, Multidisciplinary

Chlorination Enabling a Low-Cost Benzodithiophene-Based Wide-Bandgap Donor Polymer with an Efficiency of over 17%

Hang Wang et al.

Summary: Three regioregular benzodithiophene-based donor-donor (D-D)-type polymers were designed, synthesized, and used in organic solar cells (OSCs), with one of them, PBDTT1Cl, demonstrating superior performance in terms of power conversion efficiency, charge mobility, and nonradiative energy loss.

ADVANCED MATERIALS (2022)

Review Chemistry, Multidisciplinary

Polymerized Small-Molecule Acceptors for High-Performance All-Polymer Solar Cells

Zhi-Guo Zhang et al.

Summary: All-polymer solar cells have attracted significant research interest due to their good film formation, stable morphology, and mechanical flexibility. The strategy of polymerizing small-molecule acceptors to construct new-generation polymer acceptors has significantly increased the power conversion efficiency, but current challenges and future prospects still need to be addressed.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

Article Chemistry, Multidisciplinary

Optimized Active Layer Morphologies via Ternary Copolymerization of Polymer Donors for 17.6 % Efficiency Organic Solar cells with Enhanced Fill Factor

Xia Guo et al.

Summary: In this study, a ternary copolymerization approach was used to develop a new terpolymer donor PM6-Tz20 with improved active layer morphology, leading to enhanced PCE in OSCs. By replacing Al with Ag as the cathode, the champion PCE was further improved, demonstrating the effectiveness of molecular design strategy in optimizing OSC performance.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

Article Chemistry, Physical

Highly Efficient and Stable All-Polymer Solar Cells Enabled by Near-Infrared Isomerized Polymer Acceptors

Tao Wang et al.

Summary: This study investigated the effects of regioisomerized structures on the molecular and photovoltaic properties of near-infrared polymer acceptors (P(A)s) constructed from n-type fused-ring electron acceptors (FREAs). The results showed that the PYTT-2 system had the best photovoltaic performance and stability among the three isomeric FREA-based P(A)s.

CHEMISTRY OF MATERIALS (2021)

Review Polymer Science

Benzothiadiazole-based Conjugated Polymers for Organic Solar Cells

Chao Wang et al.

Summary: Benzothiadiazole (BT) is an electron-deficient unit that can be used to construct conjugated polymers for organic solar cells, with significant progress achieved in recent years.

CHINESE JOURNAL OF POLYMER SCIENCE (2021)

Article Chemistry, Multidisciplinary

An A-D-A′-D-A type unfused nonfullerene acceptor for organic solar cells with approaching 14% efficiency

Xingzheng Liu et al.

Summary: In recent years, significant improvements have been made in the power conversion efficiency (PCE) of organic solar cells (OSCs) by exploring new active layer materials, especially high efficiency acceptors. Unfused-ring acceptors (UFAs) have attracted attention for their advantages of simple synthesis and low cost compared to fused-ring acceptors. The synthesis of a new UFA BTzO-4F incorporating benzotriazole moiety and intramolecular noncovalent interactions has led to a record PCE of 13.8% for UFAs, demonstrating the great potential of UFAs for high performance OSCs.

SCIENCE CHINA-CHEMISTRY (2021)

Article Chemistry, Multidisciplinary

15.4% Efficiency all-polymer solar cells

Long Zhang et al.

Summary: By tuning the molecular weights of the polymer donor, researchers achieved a record-high power conversion efficiency in all-polymer solar cells. The combination of polymer donors with a newly reported polymer acceptor resulted in unprecedented high PCE and fill factor values. Detailed morphology investigation revealed the importance of proper phase separation in achieving superior device performance in all-polymer solar cells.

SCIENCE CHINA-CHEMISTRY (2021)

Article Multidisciplinary Sciences

Single-layered organic photovoltaics with double cascading charge transport pathways: 18% efficiencies

Ming Zhang et al.

Summary: By using quaternary blends, double cascading energy level alignment is achieved in bulk heterojunction organic photovoltaic active layers, optimizing light absorption, carrier transport, and charge-transfer state energy levels for higher power conversion efficiencies. The chemical structures of donors and acceptors allow control over electronic structure and charge-transfer state energy levels, enabling manipulation of hole-transfer rates, carrier transport, and non-radiative recombination losses.

NATURE COMMUNICATIONS (2021)

Article Chemistry, Physical

Asymmetric Alkoxy and Alkyl Substitution on Nonfullerene Acceptors Enabling High-Performance Organic Solar Cells

Yuzhong Chen et al.

Summary: The paper presents a strategy of asymmetric alkyl and alkoxy substitution on Y-series nonfullerene acceptors, achieving great performance in organic solar cell devices. Asymmetric substitution on Y6 results in a molecule that maintains V-oc improvement and good solubility, enabling highly efficient nonfullerene OSCs. This asymmetric side-chain strategy shows potential for improving the performance of other NFA-material systems.

ADVANCED ENERGY MATERIALS (2021)

Article Chemistry, Physical

Asymmetric Acceptors Enabling Organic Solar Cells to Achieve an over 17% Efficiency: Conformation Effects on Regulating Molecular Properties and Suppressing Nonradiative Energy Loss

Wei Gao et al.

Summary: This study demonstrates that adjusting the molecular conformation of Y6-type NFAs can lead to high efficiency and reduced energy loss in organic solar cells.

ADVANCED ENERGY MATERIALS (2021)

Article Chemistry, Physical

Over 17% Efficiency Binary Organic Solar Cells with Photoresponses Reaching 1000 nm Enabled by Selenophene-Fused Nonfullerene Acceptors

Feng Qi et al.

Summary: Novel NFAs were designed with enhanced absorption edge and high J(sc), leading to efficient organic solar cells with improved power conversion efficiency.

ACS ENERGY LETTERS (2021)

Article Energy & Fuels

Highly Efficient Nonfullerene Organic Solar Cells with a Self-Doped Water-Soluble Neutral Polyaniline as Hole Transport Layer

Miao Zeng et al.

Summary: The authors designed and prepared a new self-doped water-soluble polyaniline derivative, PDAS, and applied it as a hole extraction layer in nonfullerene organic solar cells. PDAS exhibits high conductivity, neutrality, and enhanced work function, with the devices' power conversion efficiency comparable to those using PEDOT:PSS as the hole extraction layer.

SOLAR RRL (2021)

Article Energy & Fuels

Molecular Donor-Acceptor Dyads for Efficient Single-Material Organic Solar Cells

Sebastian Lucas et al.

Summary: A novel structural design of oligomeric donor-acceptor (D-A) dyads has been established, showing advantageous optoelectronic, charge transport, and self-organization properties in single-material organic solar cells (SMOSCs). Post-treatment by solvent vapor annealing has also been investigated, revealing a lamellar supramolecular order of the dyads with a D-A phase separation smaller than 2 nm. The precise distance between donor and acceptor moieties ensures the fundamental physical processes operative in organic solar cells and provides stabilization of D-A interfaces.

SOLAR RRL (2021)

Article Chemistry, Multidisciplinary

High-Performance All-Polymer Solar Cells with a Pseudo-Bilayer Configuration Enabled by a Stepwise Optimization Strategy

Qiang Wu et al.

Summary: In this study, a high-efficiency PBDB-T/PYT all-organic solar cell was successfully fabricated using a special LbL deposition technique, achieving an efficiency of 15.17% through synergistic control of additive dosages. It was found that this synergistic control of additive dosages was also confirmed in other photovoltaic systems.

ADVANCED FUNCTIONAL MATERIALS (2021)

Article Chemistry, Multidisciplinary

Regio-Regular Polymer Acceptors Enabled by Determined Fluorination on End Groups for All-Polymer Solar Cells with 15.2 % Efficiency

Han Yu et al.

Summary: The two regio-regular polymer acceptors synthesized in this study show significant performance difference, with PYF-T-o exhibiting better photon absorption and more ordered inter-chain packing, resulting in higher power conversion efficiency.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

Article Chemistry, Multidisciplinary

High Efficiency (15.8%) All-Polymer Solar Cells Enabled by a Regioregular Narrow Bandgap Polymer Acceptor

Huiting Fu et al.

Summary: A new class of narrow-bandgap polymer acceptors, the PZT series, was developed to address challenges in all-polymer solar cells, resulting in improved performance due to red-shifted optical absorption and up-shifted energy levels. The regioregular PZT-gamma was specifically designed to avoid isomer formation during polymerization, leading to enhanced efficiency, short-circuit current density, and energy loss in all-PSCs.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2021)

Article Materials Science, Multidisciplinary

Insights into out-of-plane side chains effects on optoelectronic and photovoltaic properties of simple non-fused electron acceptors

Xiaodong Wang et al.

Summary: Non-fused ring electron acceptors with varied substituents were developed for efficient organic solar cells. Out-of-plane rigid substituents and noncovalent interactions were used to enhance the planarity of molecular backbones. Blend films based on these acceptors showed improved morphology and achieved good power conversion efficiencies.

ORGANIC ELECTRONICS (2021)

Article Chemistry, Applied

Novel polymer acceptors achieving 10.18% efficiency for all-polymer solar cells

Shaorong Huang et al.

Summary: The newly developed polymer acceptors PSF-IDIC and PSi-IDIC, based on extended fused ring p skeleton, exhibit strong light absorption capabilities, with PSF-IDIC showing superior device performance in terms of power conversion efficiency.

JOURNAL OF ENERGY CHEMISTRY (2021)

Article Chemistry, Physical

Simple Nonfused Ring Electron Acceptors with 3D Network Packing Structure Boosting the Efficiency of Organic Solar Cells to 15.44%

Xiaodong Wang et al.

Summary: NFREAs with increasing pi-conjugation length show enhanced molar extinction coefficient and electron mobility in blend films. The molecular conformation of 2BTh-2F is planar, supported by S···N and S···O intramolecular interactions, and it forms a 3D network packing structure compared to the 2D packing of 2Th-2F. 2BTh-2F:PBDB-T-based organic solar cells achieve a high power conversion efficiency of 14.53%, reaching a record efficiency of 15.44% when D18 is used as the donor polymer.

ADVANCED ENERGY MATERIALS (2021)

Article Multidisciplinary Sciences

Molecular design revitalizes the low-cost PTV-polymer for highly efficient organic solar cells

Junzhen Ren et al.

Summary: In this study, a new ester substituted poly(thiophene vinylene) derivative, PTVT-T, was successfully synthesized with commercially available raw materials. PTVT-T showed excellent compatibility with fullerene- and NF-based acceptors, exhibiting high efficiency in OSCs. With a power conversion efficiency of 16.20% in a PTVT-T:BTP-eC9-based device, this work demonstrates the huge potential of PTVT-T for the future commercialization of OSCs.

NATIONAL SCIENCE REVIEW (2021)

Article Chemistry, Physical

High-Efficiency All-Polymer Solar Cells with Poly-Small-Molecule Acceptors Having π-Extended Units with Broad Near-IR Absorption

Ning Su et al.

Summary: Two new poly-small-molecule acceptors, PYN-BDT and PYN-BDTF, with p-extended naphthalene rings, demonstrated broad optical cross-section macromolecular absorbers in all-polymer solar cells, leading to enhanced power conversion efficiencies. The blend morphology, GIWAXS, charge transport, exciton and carrier dynamics, and impedance-based analysis show that extending individual polymer acceptor blocks represents an efficient strategy to achieve high-performance cells with enhanced metrics.

ACS ENERGY LETTERS (2021)

Article Chemistry, Physical

16% efficiency all-polymer organic solar cells enabled by a finely tuned morphology via the design of ternary blend

Tao Liu et al.

Summary: The performance of all-polymer organic solar cells has been improved by introducing a small amount of BN-T, resulting in increased crystallinity and enhanced exciton harvesting and charge transport. This enhancement is attributed to the reduced nonradiative energy loss and improved energy and charge transfer between acceptors, making AP-OSCs potentially as efficient as devices based on small molecule acceptors.
Review Chemistry, Multidisciplinary

Double-Cable Conjugated Polymers with Pendant Rylene Diimides for Single-Component Organic Solar Cells

Shijie Liang et al.

Summary: Double-cable conjugated polymers have shown potential in organic solar cells, but face challenges such as limited chemical structures and difficulty in morphology tuning. Some novel double-cable conjugated polymers have achieved a high power conversion efficiency of 8.4%, representing a new breakthrough for SCOSCs devices.

ACCOUNTS OF CHEMICAL RESEARCH (2021)

Article Chemistry, Multidisciplinary

High-Efficiency Organic Solar Cells Based on a Low-Cost Fully Non-Fused Electron Acceptor

Yuanyuan Zhou et al.

Summary: A series of tetrathiophene-based fully non-fused ring acceptors have been developed for efficient organic solar cells, with the ability to tune solubility and packing through lateral chain size adjustments. Incorporating 2-ethylhexyl chains enhances compatibility with donor polymers and achieves high power conversion efficiencies.

ADVANCED FUNCTIONAL MATERIALS (2021)

Article Chemistry, Multidisciplinary

High-Performance Noncovalently Fused-Ring Electron Acceptors for Organic Solar Cells Enabled by Noncovalent Intramolecular Interactions and End-Group Engineering

Xin Zhang et al.

Summary: NFREAs have simple synthetic routes, high efficiencies, and low costs, but their efficiencies are still far behind those of FREAs. This study designed new NFREAs with precisely tuned electronic properties, charge transport, and energy loss to achieve high-performance solar cell efficiencies.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

Article Chemistry, Multidisciplinary

Simple Non-Fused Electron Acceptors Leading to Efficient Organic Photovoltaics

Tian-Jiao Wen et al.

Summary: Despite recent progress, organic photovoltaics (OPVs) still need to work on balancing efficiency, stability, and cost. This study developed two non-fused electron acceptors which, when blended with a specific polymer, achieved the highest reported efficiency for fully unfused electron acceptors.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

Article Chemistry, Multidisciplinary

Nonradiative Triplet Loss Suppressed in Organic Photovoltaic Blends with Fluoridated Nonfullerene Acceptors

Rui Wang et al.

Summary: The research shows that using fluorinated nonfullerene acceptors in organic photovoltaic blends can suppress the bimolecular recombination of spin-uncorrelated electrons and holes, prolonging the lifetime of charge carriers. This fluorination effect can be explained by modifying the energy alignment between the charge-transfer and locally excited triplet excited states.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2021)

Article Energy & Fuels

Non-fullerene acceptors with branched side chains and improved molecular packing to exceed 18% efficiency in organic solar cells

Chao Li et al.

Summary: The molecular design of acceptor and donor molecules has significantly advanced organic photovoltaics. By introducing branched alkyl chains in non-fullerene acceptors, favorable morphology in the active layer can be achieved, leading to a certified device efficiency of 17.9%. This modification can completely alter the molecular packing behavior of non-fullerene acceptors, resulting in improved structural order and charge transport in thin films.

NATURE ENERGY (2021)

Article Nanoscience & Nanotechnology

High-Performance Simple Nonfused Ring Electron Acceptors with Diphenylamino Flanking Groups

Xiaodong Wang et al.

Summary: Four simple nonfused ring electron acceptors were designed and synthesized, with CH3-2F showing the highest power conversion efficiency. The substituent group at the diphenylamine unit has a significant impact on the absorption and energy level of acceptors, electron mobility, and morphology of blend films. The use of diphenylamine derivatives as the flanking group can improve solubility, avoid oversized aggregates, and enhance intramolecular charge-transfer effects.

ACS APPLIED MATERIALS & INTERFACES (2021)

Article Chemistry, Multidisciplinary

Asymmetric Isomer Effects in Benzo[c ][1,2,5]thiadiazole-Fused Nonacyclic Acceptors: Dielectric Constant and Molecular Crystallinity Control for Significantly Photovoltaic Performance Enhancement

Wei Gao et al.

Summary: By systematically exploring asymmetric isomer effects, new non-acyclic electron acceptors were designed and synthesized to significantly improve the power conversion efficiency of organic solar cells. The asymmetric isomerization strategy effectively inhibits molecular aggregation and unfavorable orientations, leading to more efficient dissociation and optimized microstructure, resulting in a remarkably higher PCE.

ADVANCED FUNCTIONAL MATERIALS (2021)

Article Chemistry, Multidisciplinary

Side-Chain Engineering for Enhancing the Molecular Rigidity and Photovoltaic Performance of Noncovalently Fused-Ring Electron Acceptors

Xin Zhang et al.

Summary: Side-chain engineering is an effective strategy for regulating solubility and packing behavior of organic materials. The introduction of terminal side-chains in a new noncovalently fused-ring electron acceptor has shown to enhance molecular rigidity and intermolecular pi-pi stacking, resulting in record power conversion efficiency for organic solar cells.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

Article Chemistry, Multidisciplinary

Silicon Naphthalocyanine Tetraimides: Cathode Interlayer Materials for Highly Efficient Organic Solar Cells

Chunsheng Cai et al.

Summary: Naphthalocyanine derivatives (SiNcTI-N and SiNcTI-Br) were used as cathode interlayer materials (CIMs) in organic solar cells for the first time, showing excellent performance. Among them, SiNcTI-Br CIM exhibited high conductivity and electron mobility, effectively enhancing the efficiency of PM6:Y6-based OSCs.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

Article Chemistry, Multidisciplinary

High-performance polymer solar cells with efficiency over 18% enabled by asymmetric side chain engineering of non-fullerene acceptors

Shihao Chen et al.

Summary: The research suggests that asymmetric side-chain engineering can effectively tune the properties of non-fullerene small-molecule acceptors (NFSMAs) and improve the power conversion efficiency for binary non-fullerene polymer solar cells (NFPSCs). Introducing proper asymmetric side chains in NFSMAs can induce favorable face-on molecule orientation, enhance carrier mobilities, balance charge transport, and reduce recombination losses, leading to improved overall performance in NFPSCs.

SCIENCE CHINA-CHEMISTRY (2021)

Article Multidisciplinary Sciences

Polymerized small molecular acceptor based all-polymer solar cells with an efficiency of 16.16% via tuning polymer blend morphology by molecular design

Jiaqi Du et al.

Summary: Recent advancements have been made in all-polymer solar cells (all-PSCs) based on polymerized small molecular acceptors (PSMAs). Two new A-DA'D-A small molecule acceptor based PSMAs, PS-Se and PN-Se, were synthesized to study the impact of molecular structure on photovoltaic performance. Cryogenic transmission electron microscopy and photoinduced force microscopy revealed the aggregation behavior and morphology of the polymer and acceptor blend films, leading to higher power conversion efficiency in all-PSCs.

NATURE COMMUNICATIONS (2021)

Article Multidisciplinary Sciences

Completely non-fused electron acceptor with 3D-interpenetrated crystalline structure enables efficient and stable organic solar cell

Lijiao Ma et al.

Summary: Non-fullerene acceptors based on non-fused conjugated structures have potential for low-cost organic photovoltaic cells, but their efficiencies are lower than those of fused-ring NFAs. A new bithiophene-based non-fused core, TT-Pi, was designed, leading to the development of a completely non-fused NFA, A4T-16, which achieved a high PCE of 15.2% with 84% retention after 1300 hours under simulated AM 1.5 G illumination. This work provides insight into molecule design of non-fused NFAs through molecular geometry control.

NATURE COMMUNICATIONS (2021)

Article Multidisciplinary Sciences

Non-fullerene acceptor organic photovoltaics with intrinsic operational lifetimes over 30 years

Yongxi Li et al.

Summary: Organic photovoltaic cells (OPVs) have the potential of being a productive renewable energy technology, but the main challenge lies in their inadequate operational lifetime. Research into the instability of NFA solar cells has led to proposals for strategies to mitigate this issue.

NATURE COMMUNICATIONS (2021)

Article Chemistry, Physical

Over 17.5% efficiency ternary organic solar cells with enhanced photon utilization via a medium band gap non-fullerene acceptor

Congcong Cao et al.

Summary: The text explains the design and preparation of two medium band gap non-fullerene acceptors with low electron affinity, which are used as the third component in ternary organic solar cells. By optimizing the morphology of the film, a high-efficiency solar cell is obtained with improved charge separation and reduced exciton recombination.

JOURNAL OF MATERIALS CHEMISTRY A (2021)

Article Chemistry, Multidisciplinary

Constructing a new polymer acceptor enabled non-halogenated solvent-processed all-polymer solar cell with an efficiency of 13.8%

Chunguang Zhu et al.

Summary: A new polymer acceptor, PS1, was developed by linking a non-fullerene acceptor building block with dithienothiophen[3,2-b]pyrrolo-benzotriazole capped with 3-(dicyanomethylidene)-indan-1-one via a thiophene spacer, enabling it to be easily dissolved in non-chlorinated solvents. When using 2-methyltetrahydrofuran as the processing solvent, the all-PSC composed of PS1 and a polymer donor PTzBI-oF achieved a remarkably high power conversion efficiency of 13.8% in the light-harvesting layer.

CHEMICAL COMMUNICATIONS (2021)

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Organic diradicals enabled N-type self-doped conjugated polyelectrolyte with high transparency and enhanced conductivity

Haoran Tang et al.

Summary: This research successfully achieved n-type materials with high electron conductivity and high visible light transparency by introducing organic diradicals into conjugated polyelectrolytes, leading to the fabrication of high-efficiency organic solar cell devices.
Review Chemistry, Multidisciplinary

Machine learning for high performance organic solar cells: current scenario and future prospects

Asif Mahmood et al.

Summary: Machine learning, a field of computer science, uses algorithms to automate solutions for complex problems. Organic semiconductors are commonly used in organic solar cells, but data-driven molecular design remains a challenge in the field.

ENERGY & ENVIRONMENTAL SCIENCE (2021)

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Designing high performance conjugated materials for photovoltaic cells with the aid of intramolecular noncovalent interactions

Yahui Liu et al.

Summary: The article discusses the application of organic semiconductors in photovoltaic materials, with a focus on the design and synthesis of conjugated polymers and small molecules, as well as the effectiveness of the intramolecular noncovalent interaction design strategy.

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Philip C. Y. Chow et al.

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Bing Lu et al.

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Ruyan Zhao et al.

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Zhong Zheng et al.

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Single-Junction Organic Photovoltaic Cells with Approaching 18% Efficiency

Yong Cui et al.

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Tuning the Hybridization of Local Exciton and Charge-Transfer States in Highly Efficient Organic Photovoltaic Cells

Ye Xu et al.

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Bromination: An Alternative Strategy for Non-Fullerene Small Molecule Acceptors

Huan Wang et al.

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Yong Cui et al.

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Qishi Liu et al.

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Alloy-like ternary polymer solar cells with over 17.2% efficiency

Qiaoshi An et al.

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Understanding energetic disorder in electron-deficient-core-based non-fullerene solar cells

Jun Yuan et al.

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Zhuohan Zhang et al.

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15.3% efficiency all-small-molecule organic solar cells enabled by symmetric phenyl substitution

Jinzhao Qin et al.

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Polymer Acceptors Containing B←N Units for Organic Photovoltaics

Ruyan Zhao et al.

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Toward Efficient All-Polymer Solar Cells via Halogenation on Polymer Acceptors

Yuxiang Li et al.

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Yong Cui et al.

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Efficient Ternary Organic Solar Cells with a New Electron Acceptor Based on 3,4-(2,2-Dihexylpropylenedioxy)thiophene

Cai'e Zhang et al.

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A Non-Conjugated Polymer Acceptor for Efficient and Thermally Stable All-Polymer Solar Cells

Qunping Fan et al.

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Noncovalently Fused-Ring Electron Acceptors with C-2v Symmetry for Regulating the Morphology of Organic Solar Cells

Ran Hou et al.

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A Fully Non-fused Ring Acceptor with Planar Backbone and Near-IR Absorption for High Performance Polymer Solar Cells

Ya-Nan Chen et al.

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High-performance all-polymer solar cells with only 0.47 eV energy loss

Qiang Wu et al.

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A Non-fullerene Acceptor with Enhanced Intermolecular π-Core Interaction for High-Performance Organic Solar Cells

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Dingqin Hu et al.

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Huifeng Yao et al.

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Ternary small molecules organic photovoltaics exhibiting 12.84% efficiency

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