Polythiophene derivative comprising carbazoles as pendant groups for polymer solar cell applications
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| Title: | Polythiophene derivative comprising carbazoles as pendant groups for polymer solar cell applications |
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| Authors: | Wang, Hsing-Ju1, Chan, Li-Hsin2 lhchan@ncnu.edu.tw, Chen, Chih-Ping3, Lee, Rong-Ho1, Su, Wen-Chiung4, Jeng, Ru-Jong1 rjjeng@nchu.edu.tw |
| Source: | Thin Solid Films. May2011, Vol. 519 Issue 15, p5264-5269. 6p. |
| Subjects: | Polythiophenes, Carbazole, Solar cells, Polymers, Electrochemical analysis, Oxidation, Energy conversion, Energy levels (Quantum mechanics) |
| Abstract: | Abstract: We have prepared a polythiophene copolymer (CzPh-PT) containing 9-position substituted carbazoles as bulky pendants and investigated its application in polymer solar cell (PSC). Electrochemical study presented that the onset oxidation potential positively shifted 0.47eV for CzPh-PT in comparison with that of poly(3-hexyl thiophene). By incorporating the bulky substituent of CzPh-PT, the effective conjugation length can be curtailed, and consequently a lowered HOMO energy level (−5.38eV) was acquired. This promises better air stability and a high open circuit voltage (V oc) for the PSC. Moreover, the optical properties of CzPh-PT reveal that the presence of π–π interaction between carbazole units can enhance light harvesting ability in visible region, leading to a wide absorbance. PSC was fabricated based on an interpenetrating network of CzPh-PT as electron-sufficient polymer and [6,6]-phenyl C61 butyric acid methyl ester (PC61BM) as electron-deficient material. The PSC device based on the blend of CzPh-PT/PC61BM (w/w=1:1) gave the best preliminary result with a V oc of 0.85V, a short-circuit current of 1.57mA/cm2, and a fill factor of 0.27, offering an overall power conversion efficiency of 0.36%. Our finding suggests that the polythiophene derivative comprising bulky steric groups as side chains is promising for PSC applications. [Copyright &y& Elsevier] |
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| Database: | Engineering Source |
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