Abstract
Abstract Due to good light absorption capability, ease of production process and high potential of large area fabrication, perovskite solar cells receive a wide attention around the scientific community. Factors affecting the efficiency of perovskite solar cells include moisture, perovskite solution purity, completeness of perovskite layer and perovskite crystal grain size. In this work, the investigation of crystallization process of PbI2 as precursor for methyl ammonium lead triodide (CH3NH3PbI3) photo-absorber layer has been carried out. The inverted structure of FTO/PEDOT: PSS/CH3NH3PbI3/PCBM/Ag perovskite devices is fabricated using the two-step spin-coating method. The pre-heated PbI2 solution is left at room temperature to re-crystallize at various crystallization time (0-60 h). It was discovered that the perovskite solar cell using 48 h of crystallization time provides the highest power conversion efficiency of 9.69%. Morphology and crystallinity of perovskite layer will be discussed in relation to photovoltaic properties.
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