Fluorine Substituted Conjugated Polymer of Medium Band Gap Yields 7% Efficiency in Polymer鈭扚ullerene Solar Cells

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• 作者：Samuel C. Price ; Andrew C. Stuart ; Liqiang Yang ; Huaxing Zhou ; Wei You
• 刊名：Journal of the American Chemical Society
• 出版年：2011
• 出版时间：March 30, 2011
• 年：2011
• 卷：133
• 期：12
• 页码：4625-4631
• 全文大小：883K
• 年卷期：v.133,no.12(March 30, 2011)
• ISSN：1520-5126

文摘

Recent research advances on conjugated polymers for photovoltaic devices have focused on creating low band gap materials, but a suitable band gap is only one of many performance criteria required for a successful conjugated polymer. This work focuses on the design of two medium band gap (2.0 eV) copolymers for use in photovoltaic cells which are designed to possess a high hole mobility and low highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels. The resulting fluorinated polymer PBnDT鈭扚TAZ exhibits efficiencies above 7% when blended with [6,6]-phenyl C₆₁-butyric acid methyl ester in a typical bulk heterojunction, and efficiencies above 6% are still maintained at an active layer thicknesses of 1 渭m. PBnDT鈭扚TAZ outperforms poly(3-hexylthiophene), the current medium band gap polymer of choice, and thus is a viable candidate for use in highly efficient tandem cells. PBnDT鈭扚TAZ also highlights other performance criteria which contribute to high photovoltaic efficiency, besides a low band gap.