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

Ian C. P. SmithDepartment of Chemistry, Stanford University, Stanford, CA 94305 (USA)Eric T. HokeDepartment of Materials Science and Engineering, Stanford University, Stanford, CA 94305 (USA)Diego Solís-IbarraDepartment of Chemistry, Stanford University, Stanford, CA 94305 (USA)Michael D. McGeheeDepartment of Materials Science and Engineering, Stanford University, Stanford, CA 94305 (USA)Hemamala I. KarunadasaDepartment of Chemistry, Stanford University, Stanford, CA 94305 (USA)

2014en

ABI

Annotatsiya

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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DOI: 10.1002/ange.201406466

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