Syntheses and Photovoltaic Characterizations of Polycarbazole Derivatives with Benzothiadiazole Side Chain
Date Issued
2009
Date
2009
Author(s)
Wu, Wei-Lin
Abstract
In this studies, carbaozle derivative monomers with benzothiadiazole side chain were synthesized and polymerized. Two novel polymer, Poly[9-(2,5-bis(hexyloxy)-4- (4-(5-methyl- thiophen-2-yl)benzo[c][1,2,5]thiadiazol-7-yl)phenyl)-9H-carbazole] (P1)nd poly[9-(2,5-bis(hexyloxy)-4-(4-(5-methyl-thiophen-2-yl)benzo[c][1,2,5]thiadiazol--yl) phenyl)-9H-carbazole-alt-thiophene] (P2) were synthesized via Yamamoto coupling and Stille coupling reactions. According to thermogravimetry analysis, P1 and P2 possess great thermal stability. Due to the intramolecular electron donor-acceptor structure, the UV-visible absorption spectrum of polymers have two significant peak. From the absorption spectrum, P1 exhibits lower band gap (2.33 eV) than P2 (2.38 eV). In electrochemical analysis, copolymer P2 possesses lower highest occupied molecular orbital (HOMO) level (-5.57 eV) than homopolymer P1 (5.16 eV). Althogh P2 has higher band gap, P2 has lower HOMO which is essential parameter for high efficiency polymer solar cells. From the above analysis, carbazole derivatives with benzothiadiazoel side chain have potential for applications of polymer photovoltaics.
Subjects
Low band gap
Bulk heterojunction
Electron donor/acceptor
Solar cells
Conjugated polymers
SDGs
Type
thesis
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