Acetamidinium-Substituted Methylammonium Lead Iodide Perovskite Solar Cells with Higher Open-Circuit Voltage and Improved Intrinsic Stability

Singh, P and Mukherjee, R and Avasthi, S (2020) Acetamidinium-Substituted Methylammonium Lead Iodide Perovskite Solar Cells with Higher Open-Circuit Voltage and Improved Intrinsic Stability. In: ACS applied materials & interfaces, 12 (12). pp. 13982-13987.

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Abstract

We report acetamidinium (AA)-substituted methylammonium (MA) lead iodide perovskite solar cells. AA has a restricted C-N bond rotation because of delocalized �-electron cloud over the N-C-N bond and the presence of an additional N-H···I bond (4H-bond in AA as compared to 3H-bond in MA). These bonding structures strengthen the electrostatic interaction and stabilize the AA cation inside the perovskite matrix. AA, a larger cation, is substitutional only up to 10. Devices made with 10 AA-substituted films show an average Voc of 1.12 V, higher than the average Voc of 1.04 V in the case of MA lead halide perovskite (MAPbI3). This increase in Voc can be attributed to an increase in carrier lifetime from 20 μs in the case of MAPbI3 to 32 μs for 10 AA-substituted films respectively. Devices with 18.29 champion and 16.3 average efficiency were fabricated for films with 10 AA. Degradation experiments confirm that the material stability also makes devices more stable; under ambient exposure (72 ± 3 RH), devices with 10 AA retain 70 of their initial power conversion efficiencies (PCEs) up to 480 h. Under the same conditions, the PCEs of reference MAPbI3 devices reduced to 43 of their initial value in 480 h.

Item Type:	Journal Article
Publication:	ACS applied materials & interfaces
Publisher:	American Chemical Society
Additional Information:	The copyright of this article belongs to American Chemical Society
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	10 Jul 2020 07:58
Last Modified:	10 Jul 2020 07:58
URI:	http://eprints.iisc.ac.in/id/eprint/65056

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