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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 Conjugated Copolymers Based on Benzimidazole and Various Thiophene

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Title
Synthesis and Photovoltaic Properties of Conjugated Copolymers Based on Benzimidazole and Various Thiophene
Author
Song, SuheeKim, Gi-HwanKang, IlsooJin, YoungeupKim, IlKim, Jin YoungSuh, Hongsuk
Keywords
Absorption peaks; Benzimidazoles; Benzothiadiazoles; Bithiophenes; Conjugated copolymers; Electron donor acceptors; Organic photovoltaics; Photovoltaic property; Power conversion efficiencies; Red-shifted; Substituted carbons; White-light illumination
Issue Date
201109
Publisher
WILEY-BLACKWELL
Citation
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, v.49, no.17, pp.3751 - 3758
Abstract
A new accepter unit, dimethyl-2H-benzimidazole, was prepared and used for the synthesis of the conjugated polymers containing electron donor-acceptor pair for organic photovoltaics (OPVs). Dimethyl-2H-benzimidazole unit was designed to substitute the BT unit of poly(N-9'-heptadecanyl-2,7-carbazole-alt-5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole)) (PCDTBT). A series of new semiconducting polymers with 2,2-dimethyl-2H-benzimidazole, 9-heptadecanyl-9H-carbazole, and thiophene (or bithiophene) units was synthesized using Stille polymerization to generate PCDTMBIs (or PCBBTMBIs). In dimethyl-2H-benzimidazole, the sulfur at 2-position of BT unit was replaced with dialkyl substituted carbon, while keeping the 1,2-quinoid form, to improve the solubility of the polymers. The absorption spectra of PCDTMBIs with thiophene units exhibit two maximum peaks at about 430 and 613-645 nm in solution. The solutions of PCBBTMBIs show two absorption peaks at about 445-456 and 630-645 nm which is red-shifted about 20 nm when compared with PCDTMBIs caused by the introduction of bithiophene units. In most efficient polymer PCBBTMBI3, the device annealed at 100 degrees C for 10 min demonstrated a V-OC value of 0.60 V, a J(SC) value of 4.31 mA/cm(2), and a FF of 0.35, leading to the power conversion efficiency (PCE) of 0.91%, under white light illumination (AM 1.5 G and 100 mW/cm(2)).
URI
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DOI
http://dx.doi.org/10.1002/pola.24811
ISSN
0887-624X
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