Organic-inorganic hybrid perovskite materials have been recently emerged as a promising cost- and energy efficient light absorber material for photovoltaic applications. Unfortunately, perovskite solar cells have a problem with decreacement of power conversion efficiency due to degradation in the air. To detect the reason of degradation on perovskite solar cells, we exposed deposited CH3NH3PbI3 and HC(NH2)2PbI3 films to the O2 or (H2O+N2) atmosphere condition. Analysis of the film revealed that the large energy band gap was shown due to influence of H2O molecule in CH3NH3PbI3 and HC(NH2)2PbI3. In (H2O+N2) atmosphere conditions, the existence of CH3NH3I and HC(NH2)2I molecule has found to affect the morphology, absorption and as well as crystalline diffraction peak. The resultant perovskite crystalline structure was degraded by H2O molecules in the air exposure condition.
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