Benzotriazole-Based 3D Four-Arm Small Molecules Enable 19.1 % Efficiency for PM6: Y6-Based Ternary Organic Solar Cells

Article Chemistry, Multidisciplinary

Refining acceptor aggregation in nonfullerene organic solar cells to achieve high efficiency and superior thermal stability

Kaihu Xian et al.

Summary: By precisely controlling the acceptor aggregation, the performance and thermal stability of non-fullerene organic photovoltaics (OPVs) can be improved, resulting in higher efficiency and longer operational lifetime.

SCIENCE CHINA-CHEMISTRY (2023)

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Article Chemistry, Multidisciplinary

High-Performance Ternary Organic Solar Cells Enabled by Integrating a 3D-Shaped Guest Acceptor Derived from Perylene Diimide

Ming Liu et al.

Summary: Integrating a novel perylene diimide (PDI) derivative, TPA-4PDI, with a 3D structure into PM6:Y6 binary system can enhance the power conversion efficiency (PCE) of organic solar cells (OSCs). By incorporating 7.5 wt.% of TPA-4PDI in the ternary blend, the champion PCE of ternary OSCs reaches 18.29%, with improved V-oc, J-sc, and FF due to synergistic effects.

ADVANCED FUNCTIONAL MATERIALS (2023)

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Article Chemistry, Multidisciplinary

High-Performance Organic Solar Cells from Non-Halogenated Solvents

Di Wang et al.

Summary: The study demonstrates that high-performance organic solar cells (OSCs) can be obtained from hot spin processing of different non-halogenated solvents, achieving the highest reported efficiency of OSCs so far. The phase evolution of ternary blends during solution-to-solid transition is found to be correlated to the substrate temperature, and optimal blend films can be secured in various non-halogenated solvents with elevated substrate temperature. As a result, high-performance OSCs with excellent power conversion efficiencies have been achieved in o-xylene, p-xylene, and toluene, respectively, representing the best-performing OSCs made from non-halogenated solvents to date.

ADVANCED FUNCTIONAL MATERIALS (2022)

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Review Chemistry, Multidisciplinary

Non-Radiative Recombination Energy Losses in Non-Fullerene Organic Solar Cells

Dan He et al.

Summary: This review summarizes the recent studies and achievements on the non-radiative recombination energy loss (Delta E-3) in non-fullerene acceptor-based organic solar cells (OSCs). By exploring material design, morphology manipulation, ternary strategy, mechanism, and theoretical study, it is hoped to further reduce energy loss and enhance the power conversion efficiency.

ADVANCED FUNCTIONAL MATERIALS (2022)

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Article Chemistry, Multidisciplinary

Inhibiting excessive molecular aggregation to achieve highly efficient and stabilized organic solar cells by introducing a star-shaped nitrogen heterocyclic-ring acceptor

Xunfan Liao et al.

Summary: The star-shaped nitrogen heterocyclic-ring acceptor TF1 was introduced into the PM6:Y6 system to suppress the excessive aggregation of Y6, resulting in improved stability and performance of OSCs. The incorporation of TF1 led to enhanced short circuit current density, elevated charge transfer state energy, increased exciton lifetime and diffusion distance, and accelerated hole transfer rate in ternary OSCs. This strategy not only achieved significantly improved efficiency and stability, but also elucidated the inner workings of star-shaped small molecules in ternary OSCs.

ENERGY & ENVIRONMENTAL SCIENCE (2022)

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Article Chemistry, Multidisciplinary

Ternary strategy enabling high-efficiency rigid and flexible organic solar cells with reduced non-radiative voltage loss

Xiaopeng Duan et al.

Summary: This study demonstrates the successful fabrication of efficient ternary organic solar cells by introducing ZY-4Cl as a third component. The ternary system exhibits reduced voltage loss, improved molecular ordering, and suppressed non-radiative recombination, leading to higher efficiencies compared to binary blends.

ENERGY & ENVIRONMENTAL SCIENCE (2022)

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Article Chemistry, Physical

Truxene π-Expanded BODIPY Star-Shaped Molecules as Acceptors for Non-Fullerene Solar Cells with over 13% Efficiency

Pengfei Li et al.

Summary: In this study, two novel star-shaped electron acceptors, TBT-1 and TBT-2, based on a planar truxene core conjugated with three BODIPY units, were designed. When blended with a donor polymer P, these acceptors showed high performance in organic solar cells.

ACS APPLIED ENERGY MATERIALS (2022)

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Article Chemistry, Physical

Single-junction organic solar cells with over 19% efficiency enabled by a refined double-fibril network morphology

Lei Zhu et al.

Summary: Morphological control of donor and acceptor domains is crucial for efficient organic photovoltaics, and this study demonstrates a double-fibril network strategy to achieve a high power conversion efficiency of 19.3%.

NATURE MATERIALS (2022)

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Article Chemistry, Physical

Desired open-circuit voltage increase enables efficiencies approaching 19% in symmetric-asymmetric molecule ternary organic photovoltaics

Lingling Zhan et al.

Summary: By constructing ternary organic photovoltaics, the open-circuit voltage (V-oc) loss is reduced, leading to a higher voltage without sacrificing the absorbing range. In addition, the ternary blend exhibits enhanced charge transport property and a higher fill factor.

JOULE (2022)

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Article Chemistry, Multidisciplinary

A 4-Arm Small Molecule Acceptor with High Photovoltaic Performance

Xianyi Meng et al.

Summary: Manipulating the backbone of SMAs is crucial for developing efficient OSCs. We report a 4-arm acceptor, 4A-DFIC, unexpectedly generated in a reaction. 4A-DFIC exhibits rigid and twisted molecular plane and effective molecular stacking. It shows a low band gap and excellent light-harvesting capability. OSCs based on 4A-DFIC achieved the highest power conversion efficiencies to date for multi-arm SMA-based OSCs.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2022)

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Article Chemistry, Physical

High-Performance Ternary Organic Solar Cells through Incorporation of a Series of A2-A1-D-A1-A2 Type Nonfullerene Acceptors with Different Terminal Groups

Ai Lan et al.

Summary: This study demonstrates that the performance of ternary OSCs can be further improved by introducing three nonfullerene acceptors with similar backbones but different terminal groups. The A(1) unit plays a decisive role, and the devices incorporating BTA2 and BTA3 show enhanced short-circuit current density and fill factor simultaneously.

ACS ENERGY LETTERS (2022)

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Article Chemistry, Physical

Boosts charge utilization and enables high performance organic solar cells by marco- and micro- synergistic method

Shuai Zhang et al.

Summary: In this study, an insulating polymer with high relative dielectric constant was introduced into the ternary active layers of organic solar cells (OSCs) to improve their performance by enhancing light utilization and interface modulation.

NANO ENERGY (2022)

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Article Chemistry, Physical

Truxene pi-Expanded BODIPY Star-Shaped Molecules as Acceptors for Non-Fullerene Solar Cells with over 13% Efficiency

Pengfei Li et al.

Summary: Novel star-shaped electron acceptors were designed in this study, showing strong absorption in both visible and near-infrared regions. When blended with donor polymers, the OSCs based on these acceptors exhibited superior performance in terms of efficiency and current density.

ACS APPLIED ENERGY MATERIALS (2022)

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Article Chemistry, Physical

Modulation of Morphological, Mechanical, and Photovoltaic Properties of Ternary Organic Photovoltaic Blends for Optimum Operation

Zhongxiang Peng et al.

Summary: Ternary solar cells with both fullerene and nonfullerene acceptors have shown rapid efficiency improvement. Incorporating 20% by weight of PC71BM into the PM6:N3 blend can yield the best device efficiency and ductility. The elastic modulus of ternary blends can be accurately predicted using an extended Halpin-Tsai model, offering potential for various electronic applications.

ADVANCED ENERGY MATERIALS (2021)

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Review Chemistry, Multidisciplinary

Indolo- and Diindolocarbazoles in Organic Photovoltaic Cells

Pierre D. Harvey et al.

Summary: In recent years, indolo- and diindolocarbazoles have been widely used as electron donors and nonfullerene electron acceptors in photovoltaic materials, achieving good photoconversion efficiencies. The main feature of this structure is the presence of D-A or A-D-A units.

CHEMISTRY LETTERS (2021)

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Article Physics, Condensed Matter

Side chain engineering on D18 polymers yields 18.74% power conversion efficiency

Xianyi Meng et al.

JOURNAL OF SEMICONDUCTORS (2021)

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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)

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Article Chemistry, Multidisciplinary

Crumple Durable Ultraflexible Organic Solar Cells with an Excellent Power-per-Weight Performance

Wei Song et al.

Summary: This study demonstrates ultra-thin and ultra-lightweight organic solar cells with excellent mechanical properties and high efficiency. By introducing a third component, the rigidity and brittleness of the active layer are reduced, achieving high flexibility.

ADVANCED FUNCTIONAL MATERIALS (2021)

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Article Chemistry, Multidisciplinary

Organic Solar Cells with 18% Efficiency Enabled by an Alloy Acceptor: A Two-in-One Strategy

Feng Liu et al.

Summary: A high-performance ternary solar cell utilizing a large-bandgap polymer donor and two structurally similar small-bandgap alloy acceptors is reported, achieving a power conversion efficiency of over 18%. By delicately regulating the energy levels of the alloy acceptor through varying the ratio of the two acceptors, more efficient hole transfer and exciton separation are achieved, contributing to reduced energy loss and better overall performance compared to single acceptor systems. Such a two-in-one alloy strategy shows promise in boosting the photovoltaic performance of devices.

ADVANCED MATERIALS (2021)

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Article Chemistry, Multidisciplinary

Single-Junction Organic Photovoltaic Cell with 19% Efficiency

Yong Cui et al.

Summary: By combining material design and ternary blending strategy, a maximum power conversion efficiency of 19.0% is achieved in single-junction OPV cells. Optimized active layer structure significantly improves the photovoltaic parameters, enhancing the performance and PCE values of the cells.

ADVANCED MATERIALS (2021)

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Article Chemistry, Physical

Reduced non-radiative charge recombination enables organic photovoltaic cell approaching 19% efficiency

Pengqing Bi et al.

Summary: Introducing HDO-4Cl increased the exciton diffusion length in the acceptor phase, reducing non-radiative charge recombination and improving photon utilization efficiency in PBDB-TF: eC9-based OPV cells. This led to achieving a high-efficiency OPV cell with outstanding power conversion efficiency, demonstrating the effectiveness of regulating exciton behaviors in reducing energy loss.

JOULE (2021)

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Article Materials Science, Multidisciplinary

Non-fullerene electron acceptors with benzotrithiophene with π-extension terminal groups for the development of high-efficiency organic solar cells

Shanshan Ma et al.

Summary: Novel NFEAs, BTTBo-4F and BTTBo-4FN, were synthesized by combining BTT with pi-extension terminal groups, with BTTBo-4FN achieving higher power conversion efficiency in OSCs due to stronger absorption, narrower bandgap, and more ordered pi-stacking.

JOURNAL OF MATERIALS CHEMISTRY C (2021)

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Article Chemistry, Multidisciplinary

A facile strategy for third-component selection in non-fullerene acceptor-based ternary organic solar cells

Yun Li et al.

Summary: The ternary strategy has been proven effective for enhancing the power conversion efficiency of organic solar cells. A new design principle for selecting the appropriate third component, such as the non-fullerene acceptor, has been proposed and shown to significantly improve efficiency. This approach offers a promising pathway for further enhancing the performance of ternary OSCs.

ENERGY & ENVIRONMENTAL SCIENCE (2021)

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Article Chemistry, Multidisciplinary