Synthesis, Photophysical and Photovoltaic Properties of Conjugated Polymers Containing Fused Donor鈥揂cceptor Dithienopyrrolobenzothiadiazole and Dithienopyrroloquinoxaline Arenes

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• 作者：Yen-Ju Cheng ; Yu-Ju Ho ; Chiu-Hsiang Chen ; Wei-Shun Kao ; Cheng-En Wu ; So-Lin Hsu ; Chain-Shu Hsu
• 刊名：Macromolecules
• 出版年：2012
• 出版时间：March 27, 2012
• 年：2012
• 卷：45
• 期：6
• 页码：2690-2698
• 全文大小：593K
• 年卷期：v.45,no.6(March 27, 2012)
• ISSN：1520-5835

文摘

We have developed two nitrogen-bridged pentacyclic donor鈥揳cceptor dithienopyrrolobenzothiadiazole (DTPBT) and dithienopyrroloquinoxaline (DTPQX) arenes where the two outer electron-rich thiophene moieties are covalently fastened with the central electron-deficient benzothiadiazole and quinoxaline cores by two nitrogen bridges. These rigid and coplanar DTPBT and DTPQX building blocks were copolymerized with fluorene (F), carbazole (C) and cyclopentadithiophene (CPDT) units via Suzuki or Stille coupling polymerization to afford six new alternating copolymers PFDTPBT, PCDTPBT, PCPDTDTPBT, PFDTPQX, PCDTPQX and PCPDTDTPQX, respectively. The nitrogen bridges not only planarize the structure to induce stronger intermolecular 蟺鈥撓€ interaction but also play an important role in determining the electronic and photophysical properties of the polymers. The device based on PFDTPQX/PC₇₁BM (1:4, w/w) exhibited a open-circuit voltage (V_oc) of 0.72 V, a short-circuit current (J_sc) of 8.62 mA/cm² and a FF of 0.55 leading to a decent power conversion efficiency (PCE) of 3.40% due to the lower-lying HOMO energy level, and the highest hole-mobility of PFDTPQX.