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- Title
Photovoltaic Devices Prepared through a Trihydroxy Substitution Strategy on an Unsymmetrical Squaraine Dye.
- Authors
Wu, Jianglin; Chen, Yao; Yang, Lin; Hu, Bin; Lu, Zhiyun; Huang, Yan; Si, Changfeng; Chen, Guo
- Abstract
Abstract: A series of unsymmetrical arene‐1,3‐squaraine (USQ) derivatives with two, three, or four hydroxy (−OH) substituents, namely, <bold>USQ‐2‐OH</bold>, <bold>USQ‐3‐OH</bold>, or <bold>USQ‐4‐OH</bold>, respectively, were designed and synthesized, and the effect of the number of hydroxy groups on the optoelectronic properties of USQs were investigated. Despite the three compounds having similar UV/Vis absorption and HOMO energy levels, solution‐processed bulk‐heterojunction (BHJ) small‐molecule organic solar cells with <bold>USQ‐3‐OH</bold> as electron‐donor materials exhibit the highest power conversion efficiency of 6.07 %, which could be mainly attributed to the higher hole mobility and smaller phase separation. It is also noteworthy that the short‐circuit current (<italic>J</italic>sc) of the <bold>USQ‐3‐OH</bold>‐based device is as high as 14.95 mA cm−2, which is the highest <italic>J</italic>sc values reported for squaraine‐based BHJ solar cells to date. The results also indicate that more −OH substituents on squaraine dyes do not necessarily lead to better photovoltaic performance.
- Subjects
SQUARAINES; PHOTOVOLTAIC power generation; ANISOLE; COLUMN chromatography; DENSITY functional theory
- Publication
Chemistry - A European Journal, 2018, Vol 24, Issue 13, p3234
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201705140