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5. Recent progress in organic solar cells (Part II device engineering)

Author

Liu, Yahui, Liu, Bowen, Ma, Chang-Qi, Huang, Fei, Feng, Guitao, Chen, Hongzheng, Hou, Jianhui, Yan, Lingpeng, Wei, Qingya, Luo, Qun, Bao, Qinye, Ma, Wei, Liu, Wei, Li, Weiwei, Wan, Xiangjian, Hu, Xiaotian, Han, Yanchun, Li, Yaowen, Zhou, Yinhua, Zou, Yingping, Chen, Yiwang, Liu, Yuqiang, Meng, Lei, Li, Yongfang, Chen, Yongsheng, Tang, Zheng, Hu, Zhicheng, Zhang, Zhi-Guo, and Bo, Zhishan

Published
2022
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8. Efficient organic solar cells based on low-cost pentacyclic fused-ring small molecule acceptors with a fill factor over 80%.

Author

Wei, Qingya, Li, Yuanyuan, Chen, Weikun, Shi, Qinhao, Zhu, Shaofeng, Yan, Wensheng, and Zou, Yingping

Abstract

Small molecule acceptor (SMA) materials with pentacyclic fused-ring backbone are considered promising candidates for balancing the low-cost and high photovoltaic performance in the commercialization of organic solar cells (OSCs). However, power conversion efficiencies (PCEs) are often constrained by suboptimal short-circuit current density and fill factor, primarily due to the blue-shifted absorption spectra and poor charge transport of pentacyclic fused-ring SMAs. These limitations can be addressed by introducing multiple donor–acceptor (D–A) interactions and optimizing the side-chains. Herein, we designed and synthesized two A-DA′D-A type pentacyclic fused-ring SMAs, BZ4F-ch1 and BZ4F-ch2, featuring cyclohexyl side-chains onto the benzotriazole and terminal thiophene, respectively. Unlike the hypsochromic absorption of BZ4F-ch1 in chloroform, the BZ4F-ch1 neat film displayed a red-shifted absorption compared to the BZ4F-ch2 film. Additionally, BZ4F-ch1 exhibited a higher crystallinity than BZ4F-ch2. Moreover, the PM6: BZ4F-ch1 blend showed a superior phase separation morphology, charge transport and extraction. As a result, the PM6: BZ4F-ch1-based OSCs achieved a prominent efficiency of 16.02% with a significantly improved JSC of 23.09 mA cm−2 and FF of 80.41%. Furthermore, BZ4F-ch1 provided a high PCE/material-only cost (MOC) value of 3.56, implying decent cost-effectiveness. This work highlights the potential of pentacyclic fused-ring SMAs for developing high-performance and low-cost OSCs. [ABSTRACT FROM AUTHOR]

Published
2024
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11. Recent progress in organic solar cells (Part I material science)

Author

Liu, Yahui, Liu, Bowen, Ma, Chang-Qi, Huang, Fei, Feng, Guitao, Chen, Hongzheng, Hou, Jianhui, Yan, Lingpeng, Wei, Qingya, Luo, Qun, Bao, Qinye, Ma, Wei, Liu, Wei, Li, Weiwei, Wan, Xiangjian, Hu, Xiaotian, Han, Yanchun, Li, Yaowen, Zhou, Yinhua, Zou, Yingping, Chen, Yiwang, Li, Yongfang, Chen, Yongsheng, Tang, Zheng, Hu, Zhicheng, Zhang, Zhi-Guo, and Bo, Zhishan

Published
2022
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14. Asymmetric Alkylthio Branched Chain on Pentacyclic Small Molecular Acceptors Enables High Efficiency Organic Solar Cells.

Author

Zhou, Bigui, Liang, Songting, Chen, Weikun, Fan, Bin, Wei, Qingya, Shi, Qinhao, Yuan, Jun, and Zou, Yingping

Subjects
CLEAN energy, SOLAR cell efficiency, SOLAR cells, MOLECULAR structure, PHOTOVOLTAIC power generation
Abstract

Solution‐processible organic solar cells (OSCs) have gained much attention as one of the most promising options for sustainable energy. With rapidly increasing efficiency of OSCs, developing small molecular acceptors (SMAs) with simple molecular structures are critical for reducing the cost of photovoltaics. Herein, three new SMAs (BZ4F‐C2SEH, BZ4F‐2C2SEH, BZ4F‐SEH) are designed by the incorporation of ethyl(2‐ethylhexyl)sulfane or (2‐ethylhexyl)‐sulfane at the β‐position of thiophene. As a result, the BZ4F‐C2SEH‐based devices obtained an optimal PCE of 15.08% with a good balance between open‐circuit voltage (Voc = 0.87 V) and short‐circuit current density (Jsc = 23.27 mA cm−2) by blending with low‐cost polymer donor PTQ10. Besides, the BZ4F‐C2SEH based devices treated by thermal annealing (TA) and solvent annealing (SVA) deliver a satisfactory power conversion efficiency (PCE) of 16.18% with a Voc of 0.88 V, and a Jsc of 23.98 mA cm−2. This work highlights that attaching asymmetric alkylthio side chain at the β‐position of thiophene can be used as an effective molecular design strategy to trade off Voc and Jsc, thus improving the photovoltaic performance of OSCs. [ABSTRACT FROM AUTHOR]

Published
2024
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25. A‐DA'D‐A Type Pentacyclic Small Molecule Acceptors to Exceed 16.5% Efficiency by Heteroatom Effect at the Outer Side Chain.

Author

Zhu, Shaofeng, Shi, Changzhou, Wei, Qingya, Zhu, Can, Ren, Jie, Li, Jianghua, Meng, Lei, Li, Yongfang, Yuan, Jun, and Zou, Yingping

Subjects
SMALL molecules, THIOPHENES, SOLAR cells, CONJUGATED polymers
Abstract

Comprehensive Summary: In this work, we adopt a "heteroatom side‐chains" modification strategy to modify the thiophene units in A‐DA'D‐A (acceptor‐donor‐acceptor'‐donor‐acceptor) type pentacyclic SMAs (small molecule acceptors), that is, introducing branched alkyl chain at the β‐position of thiophene instead of straight alkyl chain, and then introducing oxygen atom at the third‐position on the basis of branched chain. Two new pentacyclic SMAs (BZ4F‐EH and BZ4F‐OEH) were synthesized, and the influence of the heteroatom side‐chains on photoelectric properties of A‐DA'D‐A type pentacyclic SMAs was systematically studied. Compared with our previously reported BZ4F (Y26), BZ4F‐EH shows slightly blue‐shifted absorption, while BZ4F‐OEH has obvious red‐shifted absorption. As a result, BZ4F‐OEH‐based binary device achieved a high power conversion efficiency (PCE) of 16.56% with a fill factor (FF) of 79.3%, which is the highest efficiency of pentacyclic SMAs to date. The results indicated that the modification of hetero‐atomization on the β‐position of thiophene is a simple and efficient way to improve the PCE of A‐DA'D‐A type SMAs, and this work provides an important guideline for future molecular design. [ABSTRACT FROM AUTHOR]

Published
2023
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26. Identifying the Signatures of Intermolecular Interactions in Blends of PM6 with Y6 and N4 Using Absorption Spectroscopy

Author

Kroh, Daniel, primary, Eller, Fabian, additional, Schötz, Konstantin, additional, Wedler, Stefan, additional, Perdigón‐Toro, Lorena, additional, Freychet, Guillaume, additional, Wei, Qingya, additional, Dörr, Maximilian, additional, Jones, David, additional, Zou, Yingping, additional, Herzig, Eva M., additional, Neher, Dieter, additional, and Köhler, Anna, additional

Published
2022
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30. Manipulating molecular aggregation and crystalline behavior of A-DAD-A type acceptors by side chain engineering in organic solar cells

Author

Liu, Wei, Zhang, Rui, Wei, Qingya, Zhu, Can, Yuan, Jun, Gao, Feng, Zou, Yingping, Liu, Wei, Zhang, Rui, Wei, Qingya, Zhu, Can, Yuan, Jun, Gao, Feng, and Zou, Yingping

Abstract

Alkyl chains engineering plays an important role in photovoltaic materials for organic solar cells. Herein, three A-DAD-A (acceptor-donor-acceptor-donor-acceptor) type acceptors named Y6, Y6-C4, and Y6-C5 with different branching position on the pyrrole motif are discussed and the relationship between molecular aggregation, crystalline, and device performance are systematically investigated. The distance between the branching position and the main backbone affects their optical absorption and energy levels. Y6-C4 and Y6-C5 with the branching position at the fourth and fifth carbon of the alkyl chain show blue-shifted absorption and increased electrochemical bandgaps, compared with Y6 with the branching position at the second carbon of the alkyl side chain. In addition, this distance influences the molecular aggregation and crystalline behavior of the donor/acceptor blends. Compared with Y6-C4, Y6-C5 possesses a stronger crystalline and aggregate ability in the blends with a lower non-radiative energy loss, which results in a higher open circuit voltage (V-oc) of 0.88 V. Finally, Y6-C5-based binary device achieved a high power conversion efficiency up to 16.73% with afill factor (FF) of 0.78. These results demonstrate that the side chain engineering is an effective strategy for tuning the molecular aggregation and crystalline to improve photovoltaic performance of the A-DAD-A type acceptors., Funding Agencies|National Key Research & Development Program of China [2017YFA0206600]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [21875286]; Natural Science Foundation of Hunan ProvinceNatural Science Foundation of Hunan Province [2021JJ20068]

Published
2022
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31. A-pi-A structured non-fullerene acceptors for stable organic solar cells with efficiency over 17%

Author

Liu, Wei, Yuan, Jun, Zhu, Can, Wei, Qingya, Liang, Songting, Zhang, Huotian, Zheng, Guanhaojie, Hu, Yunbin, Meng, Lei, Gao, Feng, Li, Yongfang, Zou, Yingping, Liu, Wei, Yuan, Jun, Zhu, Can, Wei, Qingya, Liang, Songting, Zhang, Huotian, Zheng, Guanhaojie, Hu, Yunbin, Meng, Lei, Gao, Feng, Li, Yongfang, and Zou, Yingping

Abstract

With the development of photovoltaic materials, especially the small molecule acceptors (SMAs), organic solar cells (OSCs) have made breakthroughs in power conversion efficiencies (PCEs). However, the stability of high-performance OSCs remains a critical challenge for future technological applications. To tackle the inherent instability of SMA materials under the ambient conditions, much effort has been made to improve OSCs stability, including device modification and new materials design. Here we proposed a new electron acceptor design strategy and developed a "quasi-macromolecule" (QM) with an A-pi-A structure, where the functionalized pi-bridge is used as a linker between two SMAs (A), to improve the long-term stability without deteriorating device efficiencies. Such type of QMs enables excellent synthetic flexibility to modulate their optical/electro-chemical properties, crystallization and aggregation behaviors by changing the A and pi units. Moreover, QMs possess a unique long conjugated backbone combining high molecular weight over 3.5 kDa with high purity. Compared with the corresponding SMA BTP-4F-OD (Y6-OD), the devices based on newly synthesized A-pi-A type acceptors QM1 and QM2 could exhibit better device stability and more promising PCEs of 17.05% and 16.36%, respectively. This kind of "molecular-framework" (A-pi-A) structure provides a new design strategy for developing high-efficiency and -stability photovoltaic materials., Funding Agencies|National Natural Science Foundation of China [52125306, 21875286, 22005347]; Natural Science Foundation of Hunan Province [2021JJ20068]; National Key Research and Development Program of China [2017YFA0206600]

Published
2022
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33. Understanding the Role of Order in Y‐Series Non‐Fullerene Solar Cells to Realize High Open‐Circuit Voltages

Author

Perdigón‐Toro, Lorena, primary, Phuong, Le Quang, additional, Eller, Fabian, additional, Freychet, Guillaume, additional, Saglamkaya, Elifnaz, additional, Khan, Jafar I., additional, Wei, Qingya, additional, Zeiske, Stefan, additional, Kroh, Daniel, additional, Wedler, Stefan, additional, Köhler, Anna, additional, Armin, Ardalan, additional, Laquai, Frédéric, additional, Herzig, Eva M., additional, Zou, Yingping, additional, Shoaee, Safa, additional, and Neher, Dieter, additional

Published
2022
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35. Recent progress in organic solar cells (Part I material science)

Author

Liu, Yahui, primary, Liu, Bowen, additional, Ma, Chang-Qi, additional, Huang, Fei, additional, Feng, Guitao, additional, Chen, Hongzheng, additional, Hou, Jianhui, additional, Yan, Lingpeng, additional, Wei, Qingya, additional, Luo, Qun, additional, Bao, Qinye, additional, Ma, Wei, additional, Liu, Wei, additional, Li, Weiwei, additional, Wan, Xiangjian, additional, Hu, Xiaotian, additional, Han, Yanchun, additional, Li, Yaowen, additional, Zhou, Yinhua, additional, Zou, Yingping, additional, Chen, Yiwang, additional, Li, Yongfang, additional, Chen, Yongsheng, additional, Tang, Zheng, additional, Hu, Zhicheng, additional, Zhang, Zhi-Guo, additional, and Bo, Zhishan, additional

Published
2021
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37. Compatibility between Solubility and Enhanced Crystallinity of Benzotriazole-Based Small Molecular Acceptors with Less Bulky Alkyl Chains for Organic Solar Cells

Author

Chen, Honggang, primary, Xia, Xinxin, additional, Yuan, Jun, additional, Wei, Qingya, additional, Liu, Wei, additional, Li, Zhe, additional, Zhu, Can, additional, Wang, Xiaosha, additional, Guan, Huilan, additional, Lu, Xinhui, additional, Li, Yongfang, additional, and Zou, Yingping, additional

Published
2021
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41. Over 13% Efficient Organic Solar Cells Based on Low-Cost Pentacyclic A-DA D-A-Type Nonfullerene Acceptor

Author

Song, Jiage, Cai, Fangfang, Zhu, Can, Chen, Honggang, Wei, Qingya, Li, Dongxu, Zhang, Chujun, Zhang, Rui, Yuan, Jun, Peng, Hongjian, So, Shu Kong, Zou, Yingping, Song, Jiage, Cai, Fangfang, Zhu, Can, Chen, Honggang, Wei, Qingya, Li, Dongxu, Zhang, Chujun, Zhang, Rui, Yuan, Jun, Peng, Hongjian, So, Shu Kong, and Zou, Yingping

Abstract

Recent studies have almost focused on finding active layer materials with extended pi-conjugation structures for high-performance organic solar cells (OSCs). However, with the extension of conjugate length, the synthesis difficulty and cost of materials will increase. Achieving high efficiency while reducing material costs is a prerequisite for the commercialization of OSCs. Herein, two low-cost A-DA D-A-type (where A and D represent an electron-withdrawing unit and an electron-donating unit, respectively) nonfullerene acceptors (Y25,Y26) are synthesized with pentacyclic fused backbone as the DA D electron-deficient core and 5,6-difluoro-3-(dicyandiamethyl) indigo as the end groups. Compared with classical Y series acceptors with heptacyclic backbone, although Y25 and Y26 own the reduced conjugated length, they still show moderate performance (11.65% and 13.34%), and the cost of synthesis is significantly reduced. Therefore, we provide a new molecular design idea for commercially efficient nonfullerene OSCs acceptors. We also find that adding alkyl chains to the beta site of thiophenes is beneficial to obtaining the reduced energetic disorder, dominant molecular stacking, and desirable morphology, which can facilitate charge carrier transport and prompt higher short-circuit current density (J(sc)) as well as fill factor., Funding Agencies|National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [21875286]; Hunan Intellectual Property Bureau [2016e004]; Science and Technology Plan Key Project of Hunan Province [2020GK2100]; Natural Science Foundation of Hunan ProvinceNatural Science Foundation of Hunan Province [2020JJ4721]

Published
2021
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48. Atomically precise Ag30Pd4nanocluster as efficient polysulfides redox catalyst in Li-S batteries

Author

Fan, Bin, Qin, Lubing, Chen, Weikun, He, Qian, Wei, Qingya, Tang, Zhenghua, and Zou, Yingping

Abstract

Atomically precise Ag30Pd4nanoclusters exhibit strong adsorption and catalytic activity toward lithium polysulfides, providing the reaction mechanisitic insights for dynamic transformations. The separator modified by Ag30Pd4/rGO composite can effectively suppress the shuttle effect and significantly improve the cycle stability of lithium-sulfur batteries.

Published
2024
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