Efficient Enhancement of Electron Transport and Collection Capability in PTB7:PC71 BM-based Solar Cells Enabled by Sulforhodamine Cathode Interlayers

Chemistry, an Asian Journal
Wei SongZiyi Ge

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.

References

Aug 21, 2014·Nano Letters·Hyesung ParkSilvija Gradečak
Dec 10, 2014·Journal of the American Chemical Society·Hyunbok LeeAlejandro L Briseno
Feb 7, 2015·Advanced Materials·Oh Kyu KwonSoo Young Park
Jul 27, 2017·ACS Applied Materials & Interfaces·Wang LiZiyi Ge

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