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All solid-state solar cells based on organometal trihalide perovskite absorbers have already achieved distinguished power conversion efficiency(PCE)to over 15%and further improvements are expected up to 20%.These novel organometal halide perovskite absorbers which possess exceptionally strong and broad light absorption enable to approach the performances of the best thin film technologies.Especially,the cost-effective solution process for perovskite solar cells at a low temperature makes them viable to realize flexible thin film solar cells.