Efficient solution-processed small-molecule solar cells with inverted structure.

Kyaw, Aung Ko Ko; Wang, Dong Hwan; Gupta, Vinay; Zhang, Jie; Chand, Suresh; Bazan, Guillermo C; Heeger, Alan J · Adv Mater · 2013

basic_science · Level V

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Abstract

We successfully demonstrate inverted structure small-molecule (SM) solar cells with an efficiency of 7.88% using ZnO and PEIE as an interfacial layer. Modification of ZnO with a cost-effective PEIE thin layer increases the efficiency of the inverted cell as a result of reducing the work function of the cathode and suppressing the trap-assisted recombination. In addition to the high efficiency, the inverted SM solar cells are relatively stable in air compared to conventional cells.

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