Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 7, Pages 3994-3999Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am506785k
Keywords
planar heterojunction; perovskite solar cell; polymer; electron conductor; device performance; characterization
Funding
- National High Technology Research and Development Program of China (863 Program) [2011AA050520]
- National Natural Science Foundation of China [61176054]
- Natural Science Foundation of Jiangsu Province [BK20130311]
- Postdoctoral Science Foundation [2014M550302, 1302015A]
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Inverted planar heterojunction perovskite solar cells employing different polymers, poly{[N,N'-bis(2-octyldodecyl)-1,4,5,8-naphthalene diimide-2,6-diyl]-alt-5,5'-(2,2'-bithiophene)} (N2200), poly{[N,N'-bis(alkyl)-1,4,5,8-naphthalene diimide-2,6-diyl-alt-5,5'-di(thiophen-2-yl)-2,2'-(E)-2-(2-(thiophen-2-yl)vinyl)thiophene]} (PNVT-8), and PNDI2OD-TT as electron-transporting material (ETM) have been investigated for the first time. The best device performance was obtained when N2200 was applied as the ETM, with J(SC) of 14.70 mA/cm(2), V-OC of 0.84 V, and fill factor (FF) of 66%, corresponding to a decent power conversion efficiency (PCE) of similar to 8.15%. Which is very competitive to the parameters (J(SC) 14.65 mA/cm2, VOC 0.83 V, FF 70%, and PCE 8.51%) of the reference device employing conventional PCBM as the ETM. The slightly lower FF could be mainly accounted for by the increased recombination in the polymer contained devices. This work demonstrated that polymeric materials can be used as efficient ETM in perovskite solar cells, and we believe this class of polymeric ETMs will further promote the performance of perovskite photovoltaic cells after extended investigation.
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