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25 results on '"Liu, Zhi‐Xi"'

14. Cold‐Aging and Solvent Vapor Mediated Aggregation Control toward 18% Efficiency Binary Organic Solar Cells

Author

Guo, Chuanhang, primary, Li, Donghui, additional, Wang, Liang, additional, Du, Baocai, additional, Liu, Zhi‐Xi, additional, Shen, Ziqiu, additional, Wang, Pang, additional, Zhang, Xue, additional, Cai, Jinlong, additional, Cheng, Shili, additional, Yu, Cong, additional, Wang, Hui, additional, Liu, Dan, additional, Li, Chang‐Zhi, additional, and Wang, Tao, additional

Published
2021
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21. Near‐Infrared Electron Acceptors with Fluorinated Regioisomeric Backbone for Highly Efficient Polymer Solar Cells

Author

Chen, Fang‐Xiao, primary, Xu, Jing‐Qi, additional, Liu, Zhi‐Xi, additional, Chen, Ming, additional, Xia, Ruoxi, additional, Yang, Yongchao, additional, Lau, Tsz‐Ki, additional, Zhang, Yingzhu, additional, Lu, Xinhui, additional, Yip, Hin‐Lap, additional, Jen, Alex K.‐Y., additional, Chen, Hongzheng, additional, and Li, Chang‐Zhi, additional

Published
2018
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24. Linker‐Mediated Delocalized Excited States in Dimeric Acceptors Enable Efficient Exciton Dissociation with Negligible Energy‐Level Offsets.

Author

Shi, Sheng‐Yu, Yang, Chao, Xu, Xinjie, Liu, Zhi‐Xi, Duan, Wanchun, Chen, Xing‐Xing, Lu, Zhou, Zhou, Hongping, Yu, Zhi‐Peng, and Li, Chang‐Zhi

Abstract

Efficient exciton dissociation at low energy offsets is key to overcoming voltage losses in organic solar cells. In this work, we developed two dimeric acceptors, i‐YT and o‐YT, by precisely controlling the position of an asymmetric electron‐donating linker. It induced the foldamer conformation of i‐YT with a para linkage (relative to the dicyano groups), while retaining the unfold conformation for o‐YT. This subtle structural modification influenced the molecular assembly properties, enabled near‐zero energy offset exciton dissociation and power conversion efficiencies exceeding 18 % for i‐YT based organic solar cells. Detailed excitonic dynamics further revealed that the linker position critically influences three processes: the formation of delocalized singlet excited states, ultrafast charge transfer (~5 ps) in solid blends, and the suppression of exciton recombination. Additionally, devices based on i‐YT demonstrated outstanding long‐term stability, retaining 85 % of their initial efficiency after 1,400 hours of continuous illumination. These findings introduce a new class of dimeric acceptors that combine high efficiency with exceptional stability, offering a promising pathway toward low‐energy‐loss organic photovoltaics. [ABSTRACT FROM AUTHOR]

Published
2024
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25. Unravel the Distinctive Roles of Liquid and Solid Additives in Blade‐Coated Active Layer for Organic Solar Cell Modules.

Author

Wupur, Adiljan, Li, Yaokai, Luo, Yongmin, Chen, Tianyi, Wang, Mengting, Zhang, Yiqing, Liu, Zhi‐Xi, Wu, Haotian, Tan, Honglin, Zhang, Qing, Sun, Xiaokang, Hu, Hanlin, Li, Xiong, Wu, Jiaying, Fu, Weifei, Qiu, Weiming, Yang, Xi, and Chen, Hongzheng

Subjects
*THIN films, *MARANGONI effect, *SOLAR cells, *CAPILLARY flow, *BOILING-points
Abstract

Although encouraging progress in spin‐coated small‐area organic solar cells (OSCs), reducing efficiency loss caused by differences in film uniformity and morphology when up‐scaled to large‐area modules through meniscus‐guided coating is an important but unsolved issue. In this work, in‐depth research is conducted on the influence of both liquid and solid additives on the film uniformity and morphology of active layer in blade‐coated PM6:L8‐BO binary system. The study reveals that high boiling point liquid additives like 1,8‐diiodooctane (DIO) used in blade‐coating not only delay the volatilization of the solvent but also trigger the Marangoni flow in the same direction as capillary flow, causing excessive aggregation of acceptors, therefore destroying device performance. On the contrary, the solid additive 2‐Iododiphenyl ether (IDPE), which is first reported in this work, can preserve the mechanism for improving device performance while effectively suppressing the excessive aggregation of acceptors during the film‐forming process in blade‐coating from halogen‐free solvent of toluene, resulting in highly homogeneous large‐area active layer films. Consequently, organic solar modules with an impressive efficiency of 15.34% with a total module area of 18.90 cm2 via blade‐coating based on PM6:L8‐BO are achieved. This study not only provides a deep understanding on the effect of liquid and solid additives during blade‐coating from the perspective of fluid mechanisms but also gives a pathway for the development of green solvent printed high‐efficiency OSCs. [ABSTRACT FROM AUTHOR]

Published
2024
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