Synthesis of the pyrrolo[3,2-b]pyrrole-based copolymer with enhanced open circuit voltage

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• 作者：Suhee Song^a ; Seo-Jin Ko^b ; Hyunmin Shin^a ; Youngeup Jin^c ; Il Kim^d ; Jin Young Kim^b ; ^{jykim@unist.ac.kr} ; Hongsuk Suh^a ; ^{hssuh@pusan.ac.kr}
• 关键词：Polymer ; Photovoltaic cells ; Pyrrolo[3 ; 2-b]pyrrole-2 ; 5-dione
• 刊名：Synthetic Metals
• 出版年：2012
• 出版时间：31 December, 2012
• 年：2012
• 卷：162
• 期：24
• 页码：2288-2293
• 全文大小：470 K

文摘

A new accepter unit, pyrrolo[3,2-b]pyrrole-2,5-dione, was prepared and utilized for the synthesis of the conjugated polymer containing electron donor-acceptor pair for OPVs. Pyrrolo[3,2-b]pyrrole-2,5-dione unit, regioisomer of the known pyrrolo[3,4-c]pyrrole-1,4-dione, is originated from the structure of stable synthetic pigment. The new conjugated polymer with pyrrolo[3,2-b]pyrrole-2,5-dione, thiophene and carbazole was synthesized using Suzuki polymerization to generate P1. The solid thin film of P1 shows absorption band with maximum peaks at 374 and 548 nm, and the absorption onset at 679 nm, corresponding to band gap of 1.83 eV. The field-effect hole mobility of P1 is 2.2 ¡Á 10^?5 cm²/Vs. The device based on the polymer:PCBM (1:2) blend without thermal treatment showed a V_OC of 0.82 V, a J_SC of 6.28 mA/cm², and an FF of 0.39, giving a PCE of 2.00 % .