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왕동환,Yu Jin Kim,안선용,Soyun Park,Chan Eon Park,장웅식 한국물리학회 2016 Current Applied Physics Vol.16 No.10
In this research, organic photovoltaic devices based on bulk-heterojunction (BHJ) from Poly(3- hexylthiophene-2,5-diyl) (P3HT)/[6,6]-phenyl C71 butyric acid methyl ester (PC71BM) were successfully fabricated to determine the optimization of solvent additive of 1,8-diiodooctane (DIO). The BHJ devices with DIO show improved short circuit current (JSC) correlated to the improved device performance, since the DIO in P3HT:PC71BM BHJ affects the morphology in terms of the surface roughness and crystal size. Furthermore, the DIO contributes to the enhanced charge carrier transport of the BHJ device, because the decreased fluorescence and increased hole mobility as found through Raman spectra analysis and SCLC measurement, respectively. The device with optimized concentration (1 vol %) of DIO accomplishes 5% improved photovoltaic performance due to the favorable structural property and enhanced carrier mobility.