Photo-Cross-Linkable Azide-Functionalized Polythiophene for Thermally Stable Bulk Heterojunction Solar Cells

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• 作者：Chang-Yong Nam ; Yang Qin ; Young S. Park ; Htay Hlaing ; Xinhui Lu ; Benjamin M. Ocko ; Charles T. Black ; Robert B. Grubbs
• 刊名：Macromolecules
• 出版年：2012
• 出版时间：March 13, 2012
• 年：2012
• 卷：45
• 期：5
• 页码：2338-2347
• 全文大小：533K
• 年卷期：v.45,no.5(March 13, 2012)
• ISSN：1520-5835

文摘

We have synthesized photo-cross-linkable azide-functionalized poly(3-hexylthiophene) to explore improvements in the thermal stability of bulk heterojunction solar cells. Exposing blends of photo-cross-linkable polythiophene and [6,6]-phenyl-C₆₁-butyric acid methyl ester to ultraviolet light preferentially cross-linked the polythiophene without degrading its optical or electrical properties. X-ray scattering measurements showed that cross-linking slightly compacted the polythiophene chain lamellar stacking while increasing the polymer crystal coherence length by 20%. Optimized solar cells having cross-linked active blend layers retained 65% of their initial photovoltaic power conversion efficiency after 40 h of thermal annealing at 110 掳C, while devices using un-cross-linked commercial polythiophene underwent significant phase separation and retained less than 30% of their initial efficiency after annealing.