標題: A Pentacyclic Nitrogen-Bridged Thienyl-Phenylene-Thienyl Arene for Donor-Acceptor Copolymers: Synthesis, Characterization, and Applications in Field-Effect Transistors and Polymer Solar Cells
作者: Tseng, Cheng-An
Wu, Jhong-Sian
Lin, Tai-Yen
Kao, Wei-Shun
Wu, Cheng-En
Hsu, So-Lin
Liao, Yun-Yu
Hsu, Chain-Shu
Huang, Huan-Yi
Hsieh, You-Zung
Cheng, Yen-Ju
應用化學系
Department of Applied Chemistry
關鍵字: arenes;catalysis;copolymerization;field-effect transistors;solar cells
公開日期: 1-Sep-2012
摘要: A pentacyclic benzodipyrrolothiophene (BDPT) unit, in which two outer thiophene rings are covalently fastened with the central phenylene ring by nitrogen bridges, was synthesized. The two pyrrole units embedded in BDPT were constructed by using one-pot palladium-catalyzed amination. The coplanar stannylated Sn-BDPT building block was copolymerized with electron-deficient thieno[3,4-c]pyrrole-4,6-dione (TPD), benzothiadiazole (BT), and dithienyl-diketopyrrolopyrrole (DPP) acceptors by Stille polymerization. The bridging nitrogen atoms make the BDPT motif highly electron-abundant and structurally coplanar, which allows for tailoring the optical and electronic properties of the resultant polymers. Strong photoinduced charge-transfer with significant band-broadening in the solid state and relatively higher oxidation potential are characteristic of the BDPT-based polymers. Poly(benzodipyrrolothiophene-alt-benzothiadiazole) (PBDPTBT) achieved the highest field-effect hole mobility of up to 0.02 cm2?V-1?s-1. The photovoltaic device using the PBDPTBT/PC71BM blend (1:3, w/w) exhibited a Voc of 0.6 V, a Jsc of 10.34 mA?cm-2, and a FF of 50?%, leading to a decent PCE of 3.08?%. Encouragingly, the device incorporating poly(benzodipyrrolothiophene-alt-thienopyrrolodione) (PBDPTTPD)/PC71BM (1:3, w/w) composite delivered a highest PCE of 3.72?%. The enhanced performance arises from the lower-lying HOMO value of PBDPTTPD to yield a higher Voc of 0.72 V.
URI: http://dx.doi.org/10.1002/asia.201200186
http://hdl.handle.net/11536/16856
ISSN: 1861-4728
DOI: 10.1002/asia.201200186
期刊: CHEMISTRY-AN ASIAN JOURNAL
Volume: 7
Issue: 9
起始頁: 2102
結束頁: 2110
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