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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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2,2-dimethyl-2H-benzimidazole based small molecules for organic solar cells

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Title
2,2-dimethyl-2H-benzimidazole based small molecules for organic solar cells
Author
Kim, JuaeShim, Joo YoungSong, SeyeongKim, JinwooKim, IlKim, Jin YoungSuh, Hongsuk
Issue Date
2015-02
Publisher
POLYMER SOC KOREA
Citation
MACROMOLECULAR RESEARCH, v.23, no.2, pp.214 - 222
Abstract
We report the small molecules utilizing new electron-deficient unit, 2,2-dimethyl-2H-benzimidazole (MBI) and phenanthro[9,10-c][1,2,5]thiadiazole (PT), for the photovoltaic application. Donor-acceptor-donor (D-A-D) types of conjugated small molecules containing benzo[1,2-b;3,4-b′]dithiophene (BDT) as electron rich unit and MBI and PT as electron deficient units (SM1 and SM2) were synthesized. D-A-D type of small molecules has the abilities of increasing intramolecular charge transfer (ICT) inducing long wavelength absorption and lowering the HOMO level for the improvement of open-circuit voltage (VOC). SM1 was synthesized by coupling BDT and PT units by Stille coupling reaction with Pd(0)-catalyst. By using same type of Pd(0)-catalized reaction, BDT unit and MBI unit linked with two thiophenes were coupled to provide SM2. The spectrum of SM2 in the solid thin film shows absorption band with maximum peak at 601 nm and the absorption onset at 756 nm, corresponding to band gap of 1.64 eV. The device comprising SM2 with PCBM (3:7) showed a VOC of 0.62 V, a JSC of 1.69 mA/cm2, and a fill factor (FF) of 0.27, giving a power conversion efficiency of 0.28%.
URI
https://scholarworks.unist.ac.kr/handle/201301/10726
URL
http://link.springer.com/article/10.1007%2Fs13233-015-3035-z
DOI
10.1007/s13233-015-3035-z
ISSN
1598-5032
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