A Selenophene Containing Benzodithiophene-alt-thienothiophene Polymer for Additive-Free High Performance Solar Cell

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• 作者：Wei-Hsuan Chang ; Lei Meng ; Letian Dou ; Jingbi You ; Chun-Chao Chen ; Yang (Michael) Yang ; Eric Patrick Young ; Gang Li ; Yang Yang
• 刊名：Macromolecules
• 出版年：2015
• 出版时间：February 10, 2015
• 年：2015
• 卷：48
• 期：3
• 页码：562-568
• 全文大小：425K
• ISSN：1520-5835

文摘

A selenophene-modified PTB7, PBDTSe-TT, is reported. The structure adjustment carried out by alkylselenophene substitution on the BDT building block is shown to slightly affect the polymer鈥檚 electronic property, and an enlarged V_OC of the resulting photovoltaic device is observed. More importantly, the PBDTSe-TT:PC₇₁BM bulk-heterojunction thin film morphology can be optimized through this modification. As a result, an efficient PCE of 8.8% is achieved without using any solvent additive or special interfacial layer. In addition, the PBDTSe-TT-based device is relatively stable under thermal stress, making it a good candidate for fabricating stacking cells. Finally, a 鈭?0% PCE tandem device is demonstrated by using identical PBDTSe-TT:PC₇₁BM subcells.