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Efficient Enhancement of Electron Transport and Collection Capability in PTB7:PC 71 BM‐based Solar Cells Enabled by Sulforhodamine Cathode Interlayers
Author(s) -
Song Wei,
Li Wang,
Peng Ruixiang,
Fanady Billy,
Huang Jiaming,
Zhu Wenqing,
Xie Lingchao,
Lei Tao,
Ge Ziyi
Publication year - 2019
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201900015
Subject(s) - sulforhodamine b , materials science , cathode , energy conversion efficiency , optoelectronics , nanotechnology , work function , fabrication , chemistry , medicine , biochemistry , alternative medicine , layer (electronics) , pathology , cytotoxicity , in vitro
Abstract Development of low‐cost water‐/alcohol‐soluble interfacial materials is a crucial issue to promote the commercialization of polymer solar cells (PSCs). Herein, two derivatives of low‐cost rhodamine, called sulforhodamine 101 (SR101) and sulforhodamine B (SRB), are applied as cathode interfacial layers (CILs) to effectively improve the charge‐carrier transportation and collection, reduce the work function (WF) of Al counter electrode, and decrease the series resistance and charge recombination in the PSCs. As a result, SR101‐based devices show excellent performance with the highest power conversion efficiency (PCE) of 9.10 %, superior to that of both the control devices with MeOH/Al and Ca/Al. Notably, sulforhodamine is commercially available with low cost and great solution‐processability. This work demonstrates that sulforhodamine has a great potential as a CIL material,which is suitable for the large‐area fabrication process and commercialization of highly efficient PSCs.