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Article
Chemistry, Multidisciplinary
Lili Zhang et al.
Summary: This study proposes a strategy to alleviate the conflict between small domain and ordered packing in ASM-OSCs by modulating molecular interactions to achieve good miscibility and packing simultaneously. The optimized morphology with multi-length-scale domains and highly ordered packing resulted in a record efficiency of 16.2% in ASM-OSCs, demonstrating the effectiveness of this approach in designing high-performance organic solar cells.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Guoping Li et al.
Summary: This study compares two types of end group fluorination patterns on Y6-based A-DAD-A cores, resulting in highly efficient NFAs: direct skeletal fluorination (BTF) and indirect trifluoromethyl fluorination (BTFM). The performance trends of BTF vs. BTFM OSCs can be correlated with diffraction-derived differences in molecular packing. DFT reveals low internal reorganization energies and high electronic coupling between NFA dimers, providing extended 3D charge transport networks in thin film crystalline domains.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Lai Wang et al.
Summary: The synthesis of two new hetero-dihalogenated terminals with a fluorine/chlorine or fluorine/bromine pair, along with three NFAs incorporating these terminals, led to the achievement of high-performance OSCs. The presence of a fluorine/chlorine hetero-dihalogenated terminal resulted in the most planar molecular geometry, shortest intermolecular packing distance, and largest pi-pi electronic coupling among the acceptors, leading to improved crystallinity, phase separation, charge mobility, and recombination for enhanced power conversion efficiency of up to 17.52%.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
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)
Article
Chemistry, Physical
Xiaohua Zhang et al.
Summary: In this study, the fluorination of the NFA end group was systematically investigated to understand how it affects the morphology and photovoltaic performance of the blend. The results showed that highly fluorinated NFA molecules can improve the BHJ morphology, enhance NFA-cathode contact, and enhance the photovoltaic performance of the OSC.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Lorena Perdigon-Toro et al.
Summary: This study investigates the role of energetic disorder in the blends of PM6 and Y-series NFAs. The results show that energetic disorder affects both the value and temperature dependence of the open-circuit voltage. The PM6:Y6 blend benefits from its narrower state distribution.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Jinfeng Ge et al.
Summary: Asymmetric substitution of end-groups is applied in molecular donors for the first time, resulting in donors with increased dipole moments and enhanced aggregation propensity. Among the asymmetric donors studied, SM-CA-Reh shows the highest power conversion efficiency (PCE) and fill factor (FF) when using N3 as the acceptor. Characterization results suggest that the packing morphology of blend films is mainly influenced by π-π interaction rather than dipole effect or crystallinity.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Rui Sun et al.
Summary: The ternary strategy is an effective approach to achieve high-efficiency OSCs, but the nonradiative voltage loss limits further efficiency improvements. By incorporating an asymmetric guest acceptor BTP-2F2Cl, the OSCs show improved photoluminescence quantum yield, exciton diffusion length, and absorption spectrum, leading to enhanced power conversion efficiency.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
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%.
Article
Chemistry, Physical
Zhaozhao Bi et al.
Summary: By controlling the acceptor composition and donor-acceptor miscibility, the charge losses in bulk heterojunction structures can be reduced and the efficiency of organic solar cells can be improved.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Ao Shang et al.
Summary: This study systematically investigates three isomeric non-fullerene small molecule acceptors with different alkyl side chains, and demonstrates that the size and substitution position of the alkyl side chains significantly affect the electronic properties and blend morphology of the acceptors. The solar cells based on the BTP-4F-T3EH acceptor achieve the highest device performance due to its stronger crystallinity, higher electron mobility, and appropriate intermolecular interaction with the donor polymer.
SCIENCE CHINA-CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Kuibao Yu et al.
Summary: Optimizing the morphology of the photoactive layer is a simple yet promising approach to improve the power conversion efficiencies of organic solar cells. Different post-processing treatments, including thermal annealing and solvent annealing, were compared to investigate their effects on device performances. The results showed that solvent annealing effectively improved the distribution and aggregation of polymer donors and small molecule acceptors, leading to an optimized active layer film morphology and higher conversion efficiency. In addition, a relatively high light utilization efficiency was achieved by utilizing a transparent electrode, resulting in a remarkable power conversion efficiency and visible-light transmittance.
SCIENCE CHINA-CHEMISTRY
(2022)
Article
Chemistry, Physical
Zaheer Abbas et al.
Summary: In this study, the branched alkyl chains of the Y6 molecule were fine-tuned to improve the morphological properties and photovoltaic performance of organic solar cells. The modification of the alkyl chains allowed for the formation of an optimized bulk heterojunction morphology, leading to higher power conversion efficiency and fill factor in inverted device architectures.
Article
Chemistry, Multidisciplinary
Xiaolei Kong et al.
Summary: The side chain configuration of organic small molecule acceptors (SMAs) has been found to significantly impact their intermolecular interaction and aggregation morphology. In this study, two isomeric A-DA 'D-A type SMAs with thienyl outer side chains were designed and synthesized to investigate the effects of thienyl conjugated outer side chains and the alkyl substitution position on SMA properties. It was found that the beta-substituted m-TEH SMA exhibited stronger intermolecular interaction and higher electron mobility compared to the alpha-substituted o-TEH SMA. Furthermore, the m-TEH blend film with the PBQ6 polymer donor showed more suitable phase separation, enhanced molecular packing, and improved hole and electron mobilities compared to the o-TEH blend film. Organic solar cells based on PBQ6:m-TEH achieved a significantly higher power conversion efficiency (PCE) of 18.51% compared to PBQ6:o-TEH based solar cells. This study demonstrates that m-TEH with 2-ethylhexyl beta-substituted thienyl outer side chains is an excellent high-performance SMA for organic solar cells.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Article
Chemistry, Physical
Liang Wang et al.
Summary: Tailoring the chemical structure of organic photovoltaic materials can effectively improve their aggregation and optoelectronic properties to enhance the performance of solar cells. Shortening the alkyl chain length on electron acceptor materials can enhance molecular planarity, reduce pi-pi stacking distance, and improve electron mobility, ultimately leading to improved structural order, charge mobility, and appropriate phase separation, resulting in higher power conversion efficiency in the blend with polymer donors.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Physical
Jianquan Zhang et al.
Summary: Side-chain modifications of NFAs play a crucial role in enhancing the performance of OSCs. By introducing bulkier alkyl chains branched at specific positions, it is possible to alter molecular packing, improve open-circuit voltage, and achieve better device performance. The side-chain branching design of NFAs shows great potential in optimizing molecular properties and promoting photovoltaic performance.
ADVANCED ENERGY MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
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
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
Hongtao Wang et al.
Summary: Incorporating the third component DR8 in binary blends of organic solar cells can significantly improve power conversion efficiency and enhance photovoltaic parameters, making it a promising design strategy for achieving high performance. Furthermore, the novel additive also contributes to improved device stability against thermal aging and light soaking, highlighting its potential for practical applications.
Article
Chemistry, Physical
Yuzhong Chen et al.
Summary: Chemical modifications of non-fullerene acceptors have been shown to improve the efficiency of organic solar cells. By introducing chlorination and inner side-chain engineering, a higher power conversion efficiency was achieved. Furthermore, the impact of asymmetric alkoxy substitution on the outer side chains was studied, highlighting the importance of achieving a balance between open-circuit voltage and short-circuit current density.
ADVANCED ENERGY MATERIALS
(2021)
Article
Energy & Fuels
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.
Article
Chemistry, Multidisciplinary
Jinlong Cai et al.
Summary: By systematically designing and synthesizing asymmetric and halogenated NFAs, this study demonstrates that IDTT-Cl-2F, when blended with the donor material PBDB-T-2Cl, can achieve the highest PCE among NFAs, showing superior performance.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Yunhao Cai et al.
Summary: The ternary strategy of incorporating a third component into a binary blend has led to highly efficient organic solar cells with unprecedented power conversion efficiency values.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Huifeng Meng et al.
Summary: A robust hole transporting layer (HTL) was successfully processed from Cobalt(II) acetate tetrahydrate precursor by thermal annealing (TA) and UV-ozone (UVO) treatments, achieving high work function and ideal charge extraction morphology. By optimizing the processing conditions, a record PCE of 18.77% was achieved with PM6 as the polymer donor and L8-BO as the electron acceptor, outperforming PEDOT:PSS-based solar cell devices.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
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
Chemistry, Physical
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.
Article
Chemistry, Physical
Zhenyu Chen et al.
Summary: Incorporating highly ordered crystalline small molecules into host binary systems has been shown to significantly improve the photovoltaic performance of organic solar cells. By designing and synthesizing small molecular donors with similar chemical structures, it was found that the silicon-containing G19 exhibited a higher degree of order in the host system, resulting in improved power conversion efficiency.
Article
Chemistry, Multidisciplinary
Jinzhao Qin et al.
Summary: The study found that the ternary bulk heterojunction layer with optimized composition can exhibit faster charge transfer processes, suppress geminate and non-geminate charge recombination, lower energetic disorder, and higher and more symmetric carrier mobilities. The nanoscale bicontinuous interpenetrating network with a hierarchical branched structure can be fully evolved in the BHJ layer with the optimal ternary composition.
ENERGY & ENVIRONMENTAL SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Gaoda Chai et al.
Summary: Side-chain engineering plays a crucial role in optimizing Y-series nonfullerene acceptors (NFAs) for organic solar cells (OSCs). By investigating the orientation of side chains, it was found that the meta-positioned hexylphenyl group (m-BTP-PhC6) showed the most beneficial effects on optical absorption, intermolecular packing, and phase separation of NFAs, resulting in a device efficiency of 17.7% when paired with a donor polymer PTQ10. This study demonstrates that regulating side-chain orientations of Y-series NFAs is a promising strategy for achieving favorable morphology, high charge mobility, and improved solar cell performances.
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(2020)
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Linglong Ye et al.
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(2020)
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JOURNAL OF MATERIALS CHEMISTRY A
(2020)
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Yanna Sun et al.
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(2019)
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Jun Yuan et al.
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Kui Jiang et al.
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ADVANCED ENERGY MATERIALS
(2018)
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Zichun Zhou et al.
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Yuze Lin et al.
ADVANCED MATERIALS
(2015)
