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Kim, Jin Young
Next Generation Energy Laboratory
Research Interests
  • Polymer solar cells, QD solar cells, organic-inorganic hybrid solar cells, perovskite solar cells, OLEDs, PeLEDs, organic FETs

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Synthesis and photovoltaic properties of copolymers based on 2,2-(1,5-pentamethylene)-2H-benzimidazole

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Title
Synthesis and photovoltaic properties of copolymers based on 2,2-(1,5-pentamethylene)-2H-benzimidazole
Author
Song, SuheeKang, IlsooKim, Gi-hwanJin, YoungeupKim, IlKim, Jin YoungSuh, Flongsuk
Keywords
2,2-(1,5-Pentamethylene)-2H-benzimidazole; Band gaps; Benzimidazoles; Conjugated copolymers; Coplanarity; Cyclic voltammetry data; Fill factor; High solubility; Low molecular weight; OPVs; Photovoltaic property; Power conversion efficiencies; Stille coupling reaction
Issue Date
201202
Publisher
ELSEVIER SCIENCE SA
Citation
SYNTHETIC METALS, v.162, no.1-2, pp.225 - 230
Abstract
We report synthesis and photovoltaic properties of two new conjugated copolymers with benzimidazole prepared by Stille coupling reaction. The advantage of PMBI is high solubility of the polymer while keeping the coplanarity of the backbone. The electrochemical bandgaps of PCDTPMB15 and PCBBTPMBI5, calculated from cyclic voltammetry data, are about 2.11 and 2.00 eV, respectively. The optical band gap of the synthesized PCDTPMBI5 (1.43 eV) was smaller than that of PCBBTPMBI5 (1.56 eV), caused by lower ICT effect contributed by low molecular weight of PCBBTPMBI5. The devices comprising PCDTPMBI5:PC61BM (1:2) and PCBBTPMBI5:PC61BM (1:3) with thermal treatment showed an open-circuit voltage (V-OC) of 0.27 and 0.30V, a short-circuit current density (J(SC)) of 1.09 and 1.75 mA/cm(2), and a fill factor (FF) of 0.29 and 0.38, giving an power conversion efficiency of 0.09 and 0.20%, respectively.
URI
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DOI
http://dx.doi.org/10.1016/j.synthmet.2011.12.001
ISSN
0379-6779
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