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In Situ Formation of MoO 3 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
Author(s) -
Shao Shuyan,
Liu Jian,
Bergqvist Jonas,
Shi Shengwei,
Veit Clemens,
Würfel Uli,
Xie Zhiyuan,
Zhang Fengling
Publication year - 2013
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201200609
Subject(s) - pedot:pss , materials science , polymer solar cell , chemical engineering , conductive polymer , photoactive layer , composite number , layer (electronics) , polymer , energy conversion efficiency , optoelectronics , composite material , engineering
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 poly[2,3‐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.