期刊
ACS APPLIED MATERIALS & INTERFACES
卷 2, 期 10, 页码 2699-2702出版社
AMER CHEMICAL SOC
DOI: 10.1021/am100541d
关键词
cathode interfacial layer; bulk heterojunction; solar cells; polythiophene
资金
- Hong Kong Research Grants Council [CUHK02/CRF/08, CUHK41821/09E]
- National Science Foundation of China [60990314, 60928009]
We report on thermally evaporated chromium oxide (CrOx) as cathode interfacial layer to improve the efficiency and stability in air for the bulk heterojunction solar cells of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C-61 butyric acid methyl ester (PCBM). Devices with CrOx interfacial layers show higher power conversion efficiency (PCE) and stability than those without interfacial layer. Devices with CrOx show improved stability more than 100 times that of devices without interfacial layer or with LiF interfacial layer. We tentatively attributed the CrOx interfacial layer as an electronic tunneling layer for electron collection and a protective layer of Al assumably by minimizing the organic-Al interfacial areas caused by the evaporation of Al and blocking diffusion of oxygen and water.
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