| Summary: | 碩士 === 國立成功大學 === 光電科學與工程學系 === 102 === In this study, polyethylenimine (PEI) was used as a charge extraction layer and deposited on the active layer of poly(3-hexylthiophene) (P3HT):(6,6)-phenyl C61-butyric acid methyl ester (PCBM). The influences of the microstructures of the active layer and the properties of the PEI thin film on the photovoltaic properties of the P3HT:PCBM solar cells were investigated.
The electron extraction efficiency of the specimen with PEI was compared with that without PEI. The process parameters of a PEI thin film, including solution concentration, baking temperature, baking time, and oxygen plasma treatment, were then modified to optimize the thin film properties. The photovoltaic performance of the device with PEI was finally compared with that of the device with calcium as an electron extraction layer.
The analysis of the current distribution on the thin film surface shows that the electron extraction and the hole blocking in the cathode of the device with PEI were enhanced compared with that without PEI. The device with PEI exhibited improved short circuit current density (5.04 mA/cm2 → 8.35 mA/cm2), fill factor (0.28 → 0.64), and power conversion efficiency (0.70% → 3.17%).
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