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Perovskite solar cells (PSCs) have recently drawn much attention owing to their remarkable increase in power conversion efficiency (PCE) from less than 4%to over 15%in the past five years.1-3 Recently,a theoretical calculation by Yan et al.demonstrates that the maximum PCE of the perovskite solar cells can approach 26%,4 which indicates PSCs are economically viable with very fascinating prospect for their commercialization.