Synthesis of Quinoxaline-Based Donor鈭扐cceptor Narrow-Band-Gap Polymers and Their Cyclized Derivatives for Bulk-Heterojunction Polymer Solar Cell Applications

详细信息    查看全文

• 作者：Jie Zhang ; Wanzhu Cai ; Fei Huang ; Ergang Wang ; Chengmei Zhong ; Shengjian Liu ; Ming Wang ; Chunhui Duan ; Tingbin Yang ; Yong Cao
• 刊名：Macromolecules
• 出版年：2011
• 出版时间：February 22, 2011
• 年：2011
• 卷：44
• 期：4
• 页码：894-901
• 全文大小：931K
• 年卷期：v.44,no.4(February 22, 2011)
• ISSN：1520-5835

文摘

A series of narrow-band-gap donor鈭抋cceptor (D鈭扐) conjugated polymers, with thiophene-substituted quinoxaline monomer 5,8-bis(5-bromothiophen-2-yl)-2,3-bis(5-octylthiophen-2-yl)quinoxaline (TTQx) or its cyclized phenazine derivative monomer 8,11-bis(5-bromothiophen-2-yl)-2,5-dioctyldithieno[2,3-a:3鈥?2鈥?c]phenazine (TTPz) as acceptors, were synthesized via Suzuki coupling reaction. It was found that the copolymers based on thiophene-substituted quinoxaline TTQx exhibit obviously red-shifted absorbance compared to previously reported D鈭扐 copolymers based on phenyl-substituted quinoxaline. Their analogous copolymers based on the cyclized TTPz acceptor show more pronounced red-shifted absorption spectra with a significantly decreased band gap due to the enlarged planar polycyclic aromatic ring of TTPz. Moreover, compared to the copolymers based on TTQx, the TTPz-based copolymers鈥?mobilities are also significantly increased due to the reduced steric hindrance and improved structural planarity among the copolymers. Bulk-heterojunction polymer solar cells based on the blends of the copolymers with a fullerene derivative as an acceptor exhibit promising performance, and the best device performance with power conversion efficiency up to 4.4% was achieved.