| Summary: | 碩士 === 國立成功大學 === 微電子工程研究所碩博士班 === 98 === The morphology reveals important role played for photovoltaic properties of bulk heterojunction based on Poly (3-hexylthiophene) (P3HT): [6,6]-Phenyl-C61 butyric acid methyl ester (PCBM). In this study, we investigated the effected of the P3HT:PCBM concentration on the performance of solar cells. At first, we investigate that effect of various concentrations (1wt% ~ 5wt%) on thickness of the active layers. We can obtain that optimal thickness is about 200nm, and the concentrations need to aim at the range from 3wt% to 5wt%. Moreover, the effect of various concentrations (3, 4 and 5wt%) on various annealing temperatures are investigated. The optimal performance is 4wt% concentration annealed at 130 oC, which short-circuit current (JSC) is 11.19 mA/cm2, open-circuit voltage (VOC) is 0.6V, fill factor (FF) is 0.52% , and power conversion efficiency (PCE) is 3.6%. Moreover, the absorption spectrum, photoluminescence spectrum (PL), phase image, X-ray diffraction (XRD), and estimation of hole mobility and electron mobility from spec charge limited current is used to demonstrate the concentration effect on device performance.
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