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Abstract A solution‐processed neutral hole transport layer is developed by in situ formation of MoO 3 in aqueous PEDOT:PSS dispersion (MoO 3 ‐PEDOT:PSS). This MoO 3 ‐PEDOT:PSS composite film takes advantage of both the highly conductive PEDOT:PSS and the ambient conditions stability of MoO 3 ; consequently it possesses a smooth surface and considerably reduced hygroscopicity. The resulting bulk heterojunction polymer solar cells (BHJ PSC) based on poly2,3‐bis‐(3‐octyloxyphenyl)quinoxaline‐5,8‐diyl‐alt‐thiophene‐2,5‐diyl (TQ1):6,6‐phenyl‐C 71 ‐butyric acid methyl ester (PC 70 BM) blends using MoO 3 ‐PEDOT:PSS composite film as hole transport layer (HTL) show considerable improvement in power conversion efficiency (PCE), from 5.5% to 6.4%, compared with the reference pristine PEDOT:PSS‐based device. More importantly, the device with MoO 3 ‐PEDOT:PSS HTL shows considerably improved stability, with the PCE remaining at 80% of its original value when stored in ambient air in the dark for 10 days. In comparison, the reference solar cell with PEDOT:PSS layer shows complete failure within 10 days. This MoO 3 ‐PEDOT:PSS implies the potential for low‐cost roll‐to‐roll fabrication of high‐efficiency polymer solar cells with long‐term stability at ambient conditions.
Shao et al. (Tue,) studied this question.