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19. Coordination‐Induced Defects Elimination of SnO2 Nanoparticles via a Small Electrolyte Molecule for High‐Performance Inverted Organic Solar Cells.

Author

Gao, Huaizhi, Wei, Xueqi, Yu, Runnan, Cao, Fong‐Yi, Gong, Yongshuai, Ma, Zongwen, Cheng, Yen‐Ju, Hsu, Chain‐Shu, and Tan, Zhan'ao

Subjects
*SOLAR cells, *PHOTOVOLTAIC power systems, *ELECTRON work function, *SMALL molecules, *ELECTRON donors, *ELECTRON transport, *NANOPARTICLES
Abstract

Tin oxide (SnO2) is broadly used as an electron transport layer (ETL) in organic solar cells (OSCs). However, there are many hydroxyl groups and the defects of oxygen vacancy on the surface of SnO2, resulting in charge recombination. Herein, an electrolyte 4‐(dimethyl(pyridin‐2‐yl) ammonio)butane‐1‐sulfonate (PAS) is doped into SnO2 films with an appropriate proportion to improve the performance of the inverted OSCs. The PAS can coordinate with the Sn atoms in SnO2 films to reduce the surface defects, resulting adjustable work function and increased electron conductivity. Meanwhile, the PAS doping can decrease the surface energy of SnO2 layer, forming vertical phase distribution of the active layer for better exciton dissociation and charge transport. The PM6:Y6 based inverted OSC with SnO2 ETL shows a power conversion efficiency (PCE) of 14.72%, while the device with PAS‐doped SnO2 ETL demonstrates greatly enhanced PCE of 16.37%. The device performance can be further improved by using PM6:BTP‐eC9 as active layer and a PCE of 17.12% can be achieved with PAS‐doped SnO2 ETL. Furthermore, PAS‐doped SnO2 can effectively enhance the device stability under continuous illumination. These findings demonstrate that exquisite regulation of SnO2 layer via a small electrolyte molecule coordination is a promising approach to achieve efficient and stable inverted OSCs. [ABSTRACT FROM AUTHOR]

Published
2022
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26. Recent advances of organometallic complexes in emerging photovoltaics

Author

Gao, Huaizhi, Yu, Runnan, Ma, Zongwen, Gong, Yongshuai, Zhao, Biao, Lv, Qianglong, and Tan, Zhan'ao

Abstract

Organometallic complexes (OMCs) consisting of organic and metal active moieties have shown immense potential for application in solar cells. The diverse structure, rich porosity, and unique charge centers of OMCs enable them to be functional in solar cells. In this review, we introduced four types of OMCs, such as crown organometallic complexes, β‐diketone metal complexes, cyclometallic complexes, and main chain metal‐containing polymers, providing an in‐depth analysis of the structure‐performance relationship. OMCs could serve as active or interlayer materials in a variety of solar cell systems such as organic solar cells, perovskite solar cells, and dye‐sensitized solar cells, especially some metals to improve the photoelectric performance of the device as dopants. In the end, perspectives on the opportunities and challenges of OMCs are given.

Published
2022
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