| Summary: | 碩士 === 國立交通大學 === 照明與能源光電研究所 === 105 === We propose a novel carrier transporting layer composed of tungsten trioxide (WO3) nanomaterials and cesium carbonate (Cs2CO3)/ [6,6]-phenyl-C60-butyric acid methyl ester (PCBM) buffer bilayer for the fabrication of perovskite solar cells (PSCs). Two different types of WO3, including nanoparticles and nanorods, were prepared by sol-gel process and hydrothermal method, respectively. Cs2CO3/PCBM buffer bilayer was inserted between WO3 and perovskite layers to improve carriers transfer efficiency and to form pinhole-free perovskite layer. Besides, the leakage current of the device containing Cs2CO3/PCBM buffer bilayer was effectively suppressed. The best device based on WO3 nanoparticles and Cs2CO3/PCBM buffer bilayer showed an open-circuit voltage of 0.84 V, a short-circuit current density of 20.4 mA/cm2, a fill factor of 0.61, and a power conversion efficiency of 10.49%, which were significantly higher than those of PSCs without Cs2CO3/PCBM buffer bilayer. The results revealed effective improvement in the performance of PSCs based on the combination of WO3 nanomaterials and Cs2CO3/PCBM buffer bilayer.
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