title: Inverted planar heterojunction perovskite solar cells employing polymer as the electron conductor.
abstract: 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 JSC of 14.70 mA/cm2, VOC of 0.84 V, and fill factor (FF) of 66%, corresponding to a decent power conversion efficiency (PCE) of ∼ 8.15%. Which is very competitive to the parameters (JSC 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.
authors: Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University , 199 Ren-Ai Road, Suzhou Industrial Park, Suzhou 215123, China.
authors: Weiwei
authors: W
authors: Wang
authors: Jianyu
authors: J
authors: Yuan
authors: Guozheng
authors: G
authors: Shi
authors: Xiangxiang
authors: X
authors: Zhu
authors: Shaohua
authors: S
authors: Shi
authors: Zeke
authors: Z
authors: Liu
authors: Lu
authors: L
authors: Han
authors: Hai-Qiao
authors: HQ
authors: Wang
authors: Wanli
authors: W
authors: Ma
keywords: characterization; device performance; electron conductor; perovskite solar cell; planar heterojunction; polymer