https://scholars.lib.ntu.edu.tw/handle/123456789/370605
Title: | Biaxially extended quaterthiophene- and octithiophene-vinylene conjugated polymers for high performance field effect transistors and photovoltaic cells | Authors: | Lu, C. Wu, H.C. Chiu, Y.C. Lee, W.Y. Chen, W.C. WEN-CHANG CHEN |
Issue Date: | 2012 | Journal Volume: | 45 | Journal Issue: | 7 | Start page/Pages: | 3047-3056 | Source: | Macromolecules | Abstract: | We report the synthesis, morphology, and optoelectronic device applications of novel biaxially extended quaterthiophene- (4T-) and octithiophene- (8T-) vinylene conjugated polymers, P4TV and P8TV, synthesized via Stille coupling reactions. P4TV and P8TV exhibited smaller energy band gaps of 1.69 and 1.78 eV than that of parent polythiophenes, respectively, due to the reduced conformation distortion by the vinylene linkage. The HOMO energy levels of P4TV and P8TV were -5.02 and -5.13 eV, respectively, resulting in air stable device performance. The highest field effect hole mobilities of P4TV and P8TV were 0.12 and 0.0018 cm 2 V -1 s -1, respectively, with on/off ratios around 10 4-10 5. The higher carrier mobility of P4TV was related to its ordered structure as evidenced from the TEM, AFM, and grazing incidence X-ray diffraction results. The power conversion efficiency (PCE) of the P4TV/ PC 71BM based photovoltaic cells (PV) under the illumination of AM 1.5G (100 mW/cm 2) was 4.04%, which was significantly higher than that of P8TV/PC 71BM with 2.69%, due to its superior charge transport ability. However, P8TV had a better environmental stability attributed to its low-lying HOMO energy level. These above results demonstrate that biaxially extended thiophene-vinylene conjugated copolymers could be promising materials for high performance organic electronic device applications. © 2012 American Chemical Society. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-84859620711&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/370605 |
DOI: | 10.1021/ma300313y | SDG/Keyword: | AFM; Air stable; Conjugated copolymers; Device performance; Environmental stability; Field effects; Grazing incidence X-ray diffraction; HOMO energy levels; On/off ratio; Ordered structures; Organic electronic devices; Power conversion efficiencies; Quaterthiophene; Stille coupling reaction; Conversion efficiency; Optoelectronic devices; Photoelectrochemical cells; Photovoltaic cells; Photovoltaic effects; Thiophene; X ray diffraction; Field effect transistors |
Appears in Collections: | 化學工程學系 |
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