A simultaneous achievement of high performance and extended thermal stability of bulk-heterojunction polymer solar cells using a polythiophene-fullerene block copolymer

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• 作者：Myoung Hee Yun ; Jonggi Kim ; Changduk Yang ; Jin Young Kim
• 关键词：Polymer solar cells ; Bulk-heterojunction ; Diblock copolymer ; Compatibilizer ; Stability
• 刊名：Solar Energy Materials and Solar Cells
• 出版年：2012
• 出版时间：September, 2012
• 年：2012
• 卷：104
• 期：Complete
• 页码：7-12
• 全文大小：851 K

文摘

We report substantial improvements in efficiency and thermal stability of the poly(3-hexylthiophene):[6,6]-phenyl-C₆₁-butyric acid methyl ester (PCBM) (P3HT:PCBM) bulk heterojunction (BHJ) system by adding a diblock copolymer P3HT-b-P(St₈₉BAz₁₁)-C₆₀ (P3HT=poly (3-hexylthiophene), St=styrene, BAz=benzyl azide) as a compatibilizer. Small amounts of the diblock copolymer alter the interfacial morphology between the P3HT and PCBM components, resulting in a noticeable difference in phase segregation of the BHJ films, as evident in atomic force microscopy images. The best performance is observed in the P3HT:PCBM cell with 10 % P3HT-b-P(St₈₉BAz₁₁)-C₆₀, which exhibits substantially improved power conversion efficiency and thermal stability compared to the P3HT:PCBM control device.