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Recently, lead-halide perovskites CH3NH3PbX3 (X = I, Br, and Cl) are attracting considerable attention as a new class of photonic device materials. Especially in case of thin-film solar cells based on perovskite CH3NH3PbI3, the high power conversion efficiency (exceed 22%) has been already achieved and to attain the long-term stability and large-area device fabrication become major research topics...
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