期刊
SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷 108, 期 -, 页码 1-8出版社
ELSEVIER
DOI: 10.1016/j.solmat.2012.09.006
关键词
Polymer; Photovoltaic; Interlayer
资金
- National Research Foundation of Korea (NRF) of the Korea government (MEST) [2012R1-A2A2A01015654]
- Converging Research Center Program through the Ministry of Education, Science and Technology [2012-K001303]
- Basic Science Research Program through a National Research Foundation of Korea (NRF) of the Korea government (MEST) [20110000848]
- Kwangwoon University
We herein report on the improved performance of inverted polymer solar cells (PSCs) that consist of a bulk-heterojunction (BHJ) photovoltaic (PV) layer with a water-processable electron-collecting interlayer of a hybrid poly(ethylene oxide) (PEO) and caesium carbonate (Cs2CO3) compound. For the BHJ PV layers of poly(3-hexylthiophene):phenyl C-61-butyric acid methyl ester (P3HT:PCBM), we found that the introduction of a solution-processed hybrid PEO:Cs2CO3 interlayer dramatically enhanced the performance of the cells, resulting in improved power conversion efficiencies (PCEs) of 3.8% for the inverted PSCs on glass substrates. These improvements may be attributed to a reduction in the work function of the ITO cathode together with the dual functions of electron-selective/hole-blocking effects of the PEO:Cs2CO3 interlayer. Moreover, the influence of the introduction of the PEO:Cs2CO3 interlayer on device performance was also examined even for flexible inverted PSCs on plastic substrates, and a high PCE of 2.8% was obtained for these inverted structures. The use of this approach in the design of electron-collecting interlayers in flexible inverted PSC structures could be of considerable benefit in the future development of all-solution- and roll-to-roll processed PSCs. (C) 2012 Elsevier B.V. All rights reserved.
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