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Benzo[1,2,5]thiadiazole을 기본 골격으로 한 공액고분자의 합성 및 광전변환특성 연구
배준휘 ( Jun Huei Bea ),임경은 ( Gyeong Eun Lim ),김주현 ( Joo Hyun Kim ) 한국공업화학회 2013 공업화학 Vol.24 No.4
Alternating copolymers, poly[9-(2-octyl-dodecyl)-9H-carbazole-alt-4,7-di-thiophen-2-yl-benzo[1,2,5]thiadiazole] (PCD20TBT) and poly[9,10-bis-(2-octyl-dodecyloxy)-phenanthrene-alt-4,7-di-thiophen-2-yl-benzo[1,2,5]thiadiazole] (PN40TBT), were synthesized by the Suzuki coupling reaction. The copolymers were soluble in common organic solvents such as chloroform, chlorobenzene, 1,2-dichlorobenzene, tetrahydrofuran and toluene. The maximum absorption wavelength and the band gap of PCD20TBT were 535 nm and 1.75 eV, respectively. The maximum absorption wavelength and the band gap of PN40TBT were 560 nm and 1.97 eV, respectively. The HOMO and the LUMO energy level of PCD20TBT were -5.11 eV and -3.36 eV, respectively. As for PN40TBT, the HOMO and the LUMO energy level of PCD20TBT were -5.31 eV and -3.34 eV, respectively. The polymer solar cells (PSCs) based on the blend of copolymer and PCBM (1 : 2 by weight ratio) were fabricated. The power conversion efficiencies of PSCs based on PCD20TBT and PN40TBT were 0.52% and 0.60%, respectively. The short circuit current density (JSC), fill factor (FF) and open circuit voltage (VOC) of the device with PCD20TBT were -1.97 mA/cm 2, 38.2% and 0.69 V. For PN40TBT, the JSC, FF, and VOC were -1.77 mA/cm 2, 42.9%, and 0.79 V, respectively.
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