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Synthesis of indolo[3,2-b]carbazole-based random copolymers for polymer solar cell applications.

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Bibliographic Details
Title: Synthesis of indolo[3,2-b]carbazole-based random copolymers for polymer solar cell applications.
Authors: Chan, Li-Hsin1 lhchan@ncnu.edu.tw, Lin, Lu-Chi1, Yao, Chi-Han1, Liu, You-Ren2, Jiang, Zong-Jhih2, Cho, Ting-Yu1
Source: Thin Solid Films. Oct2013, Vol. 544, p386-391. 6p.
Subjects: Carbazole, Chemical synthesis, Copolymers, Solar cells, Heterojunctions, Thiophenes, Electrochemistry
Abstract: Abstract: In addition to preparing two indolocarbazole-based random copolymers (named as r-PICTBT1 and r-PICTBT2), this work investigated their feasibility for bulk heterojunction polymer solar cells (PSCs). These copolymers consisted of commercially available 3,9-dibromo-5,11-dioctyl-5,11-dihydroindole[3,2-b]carbazole, 2,5-bis(trimethylstannyl) thiophene and dibromobenzo[c][1,2,5]thiadiazole by varying the feed in ratios via Stille cross-coupling reactions. The photophysical and electrochemical properties of the resulting copolymers could be fine-modulated easily by adjusting the feed ratios of monomers. Both copolymers in the thin film state exhibited two obvious peaks and a vibronic shoulder in the absorption spectra. Electrochemical experiments indicated that the highest occupied molecular orbital energy levels were −4.95, −5.00eV; meanwhile, the lowest unoccupied molecular orbital energy levels were −3.38, −3.54eV for r-PICTBT1 and r-PICTBT2, respectively. Bulk heterojunction PSCs composed of an electron-donor copolymer blended with an electron acceptor [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) or [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) at a weight ratio of 1:1 or 1:3 were investigated. Moreover, the r-PICTBT2/PC71BM-based (w/w=1:1) PSC performed the best with an open-circuit voltage of 0.54V, short-circuit current of 6.83mA/cm2, fill factor of 0.44, and power conversion efficiency of 1.63%. [Copyright &y& Elsevier]
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Database: Engineering Source
Description
Abstract:Abstract: In addition to preparing two indolocarbazole-based random copolymers (named as r-PICTBT1 and r-PICTBT2), this work investigated their feasibility for bulk heterojunction polymer solar cells (PSCs). These copolymers consisted of commercially available 3,9-dibromo-5,11-dioctyl-5,11-dihydroindole[3,2-b]carbazole, 2,5-bis(trimethylstannyl) thiophene and dibromobenzo[c][1,2,5]thiadiazole by varying the feed in ratios via Stille cross-coupling reactions. The photophysical and electrochemical properties of the resulting copolymers could be fine-modulated easily by adjusting the feed ratios of monomers. Both copolymers in the thin film state exhibited two obvious peaks and a vibronic shoulder in the absorption spectra. Electrochemical experiments indicated that the highest occupied molecular orbital energy levels were −4.95, −5.00eV; meanwhile, the lowest unoccupied molecular orbital energy levels were −3.38, −3.54eV for r-PICTBT1 and r-PICTBT2, respectively. Bulk heterojunction PSCs composed of an electron-donor copolymer blended with an electron acceptor [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) or [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) at a weight ratio of 1:1 or 1:3 were investigated. Moreover, the r-PICTBT2/PC71BM-based (w/w=1:1) PSC performed the best with an open-circuit voltage of 0.54V, short-circuit current of 6.83mA/cm2, fill factor of 0.44, and power conversion efficiency of 1.63%. [Copyright &y& Elsevier]
ISSN:00406090
DOI:10.1016/j.tsf.2013.02.094