期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 29, 页码 16078-16085出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b04555
关键词
graphene; cellulose; polymer solar cells; electron transport layer; nanocomposites
资金
- National Science Fund for Distinguished Young Scholars [51425304]
- National Natural Science Foundation of China [51273088, 51263016, 51473075]
- National Basic Research Program of China (973 Program) [2014CB260409]
A novel electron transport layer (ETL) based on zinc oxide@graphene:ethyl cellulose (ZnO@G:EC) nanocomposite is prepared by in situ formation of zinc oxide (ZnO) nanocrystals in a graphene matrix to improve the performance of polymer solar cells. Liquid ultrasound exfoliation by ethyl cellulose as stabilizer not only :allows for uniform dispersion of graphene solution but also maintains an original structure of graphene,gaining a high conductivity. The ZnO@G:EC ETL displays a quite smooth morphology and develops the energy-level alignment for the electron extraction and transportation. Subsequently, the device based on poly(3-hexylthiophene) (P3HT):(6,6)-phenyl-C-61 butyric acid methyl ester (PC61BM) with the ZnO@G:EC as ETL obtains a power conversion efficiency (PCE) of 3.9%, exhibiting a similar to 20% improvement compared to the familiar device with bare ZnO nanocrystals as ETL. Replacing the active layer with polythieno[3,4-b]thiophene/benzodithiophene (PTB7): (6,6)-phenyl-C-71 butyric acid methyl ester (PC71BM,), the PCE can be dramatically improved to 8.4%. This facile and fascinating method to produce a smooth and highly conductive electron transport layer provides an anticipated approach to obtain high performance polymer solar cells.
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