A Layered Hybrid Perovskite Solar‐Cell Absorber with Enhanced Moisture Stability

Abstract Two‐dimensional hybrid perovskites are used as absorbers in solar cells. Our first‐generation devices containing (PEA) 2 (MA) 2 [Pb 3 I 10 ] ( 1 ; PEA=C 6 H 5 (CH 2 ) 2 NH 3 + , MA=CH 3 NH 3 + ) show an open‐circuit voltage of 1.18 V and a power conversion efficiency of 4.73 %. The layered structure allows for high‐quality films to be deposited through spin coating and high‐temperature annealing is not required for device fabrication. The 3D perovskite (MA)[PbI 3 ] ( 2 ) has recently been identified as a promising absorber for solar cells. However, its instability to moisture requires anhydrous processing and operating conditions. Films of 1 are more moisture resistant than films of 2 and devices containing 1 can be fabricated under ambient humidity levels. The larger bandgap of the 2D structure is also suitable as the higher bandgap absorber in a dual‐absorber tandem device. Compared to 2 , the layered perovskite structure may offer greater tunability at the molecular level for material optimization.

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