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Y.S. Kim,Y. Lee,Wonjoo Lee,Hanok Park,한성환,이수형 한국물리학회 2010 Current Applied Physics Vol.10 No.1
This paper reports the effect of the molecular weight (MW) and polydispersity (PD) of poly (3-hexylthiophene)(P3HT) in bulk heterojunction polymer solar cells (BHJ-SCs). The P3HT with low MW and broad PD exhibited higher crystallinity compared to that with high MW and narrow PD. Due to the improved crystallinity, the BHJ-SCs based on P3HT with low MW and broad PD showed performance with a power conversion efficiency of 3.8% with short-circuit currents of -9.90 mA/㎠.
Effect of solvents on the performance and morphology of polymer photovoltaic devices
Y.S. Kim,Y. Lee,김재경,Eun-Ok Seo,Eun-Woo Lee,이원주,한성환,이수형 한국물리학회 2010 Current Applied Physics Vol.10 No.4
In the polymer photovoltaic devices (PVDs), the performance of devices was strongly influenced by region-regularity, number average molecular weight and casting solvents of polymers. In this work, we fabricated p–n bulk-hetero-junction PVDs based on poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C60-butyric acid methyl ester (PCBM) using various solvents such as chloroform (CF), chlorobenzene (CB), dichlorobenzene (DCB), and mixed solvent (CF/CB, CF/DCB). Thin film of active layer with P3HT/PCBM was prepared by spin coating and thermal annealing at 150 ℃ with fixed thickness about 110 nm by adjusting solution concentration. The crystalline morphology and layered phase for the active layer were studied by atomic force microscopy and X-ray diffraction, respectively. We investigated the performance of solar cells according to different morphology and crystallinity of active layer by various solvent and mixed solvent.