Journal
THIN SOLID FILMS
Volume 519, Issue 15, Pages 5264-5269Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2011.01.173
Keywords
Polythiophenes; Bulky pendant; Carbazole; Conjugated side chain; Polymer solar cell
Categories
Funding
- National Science Council (NSC) of Taiwan
- Chung-San Institute of Science
- Ministry of Education, Taiwan
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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 0.47 eV 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 (-5.38 eV) 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 pi-pi 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 C-61 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 0.85 V, a short-circuit current of 1.57 mA/cm(2), 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. (C) 2011 Elsevier B.V. All rights reserved.
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