期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 4, 期 10, 页码 3784-3791出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta00957c
关键词
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资金
- Pioneer Research Center Program [NRF-2013M3C1A3065528]
- Basic Science Research Program through the National Research Foundation (NRF) of Korea [NRF-2014R1A1A1003341, 2011-0028320]
- Ministry of Science, ICT & Future Planning
- Korea Research Fellowship Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning [2015H1D3A1066333]
Highly efficient and air-stable inverted organic solar cells (IOSCs) were fabricated from solution-processed non-conjugated polyethylenimine ethoxylated (PEIE) as the polyelectrolyte, a zinc oxide (ZnO) bilayer as the electron transport layer, and an active layer of thieno[3,4-b] thiophene/benzodithiophene (PTB7) and [6,6]-phenyl-C-71-butyric acid methyl ester (PC71BM). When compared to conventional ZnO thin film devices, the incorporation of ZnO with nano-ridge structures (ZnO-R) and large interfacial areas, in addition to low leakage currents, led to an enhancement in power conversion efficiency from 7.41% to 8.38%. Furthermore, the presence of a thin PEIE layer between ITO and ZnO-R not only suppressed the formation of an oxygen deficient state at the ZnO-R surface, but also improved charge carrier mobilities and prevented leakage currents. Consequently, a maximum (average) efficiency of 8.91% (8.86%) and superior air stability with approximately 65% of the initial efficiency being retained after 326 days of storage under ambient atmosphere were achieved.
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