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Shuyan Shao, Jian Liu, Jonas Bergqvist, Shengwei Shi, Clemens Veit, Uli Würfel, Zhiyuan Xie and Fengling Zhang In Situ Formation of MoO3 in PEDOT:PSS Matrix: A Facile Way to Produce a Smooth and Less Hygroscopic Hole Transport Layer for Highly Stable Polymer Bulk Heterojunction Solar Cells Advanced Energy Materials 3

Version of Record online: 30 OCT 2012 | DOI: 10.1002/aenm.201200609

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A solution-processed MoO3-PEDOT:PSS used as hole transport layer in polymer solar cells (PSCs) is reported. This MoO3-PEDOT:PSS composite film has smooth surface morphology. TQ1:PC70BM-based PSCs incorporating this composite hole-transport layer demonstrate a high PCE of 6.4%. Of more importance is the greatly improved ambient stability that can be achieved by replacing strongly hygroscopic PEDOT:PSS with a less hygroscopic MoO3-PEDOT:PSS layer. This MoO3-PEDOT:PSS composite film implies the potential for low-cost roll-to-roll fabrication of efficient polymer solar cells with long-term stability at ambient conditions.

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