| Summary: | 碩士 === 國立清華大學 === 光電工程研究所 === 94 === In this thesis, we applied a hybrid thin film growth technique to solar cells and investigated the characteristics. The organic thin-film solar cells comprise a CuPc/PCBM heterostructure. The electron-donor material, CuPc, was grown by thermal evaporation, whereas the electron-acceptor material, PCBM, was dissolved in toluene and grown by spin coating. The structure with the best measured power conversion efficiency is ITO/CuPc(40nm)/PCBM(50nm)/BCP(10nm)/Ag(100nm). We modified the thickness of both CuPc and PCBM to optimize its performance, in which JSC=2.87mA/cm2, VOC=0.352V, fill factor(FF)=0.284 and efficiency(η) =0.28%. Although the conversion efficiency increases with the thicknesses of CuPc, the roughnesses and grain sizes of CuPc also increase at the same time. The deteriorated morphology of PCBM results in tremendous leakage in our devices, which explains the lower than expected conversion efficiency.
key words：organic solar cells, thermal evaporation, spin coating, and power conversion efficiency.
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