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Organic spacer cations in layered 2D(A1)2(A2)n-1BnX3n+1(where A1 is an organic cation acting as a spacer between the perovskite layers,A2 is a monovalent cation,e.g.,Cs+,CH3NH3+,CH(NH2)2+)perovskite materials improve the long-term stability of the resulting solar cells,but hamper their power conversion efficiency due to poor carrier generation/transportation.