Enhancing Photostability of Sn-Pb Perovskite Solar Cells by an Alkylammonium Pseudo-Halogen Additive

Wang, Jiantao; Uddin, Md Aslam; Chen, Bo; Ying, Xingjian; Ni, Zhenyi; Zhou, Ying; Li, Mingze; Wang, Mengru; Yu, Zhenhua; Huang, Jinsong

doi:10.1002/aenm.202204115

Title: Enhancing Photostability of Sn-Pb Perovskite Solar Cells by an Alkylammonium Pseudo-Halogen Additive

Journal Article · Wed Mar 01 00:00:00 EST 2023 · Advanced Energy Materials

DOI:https://doi.org/10.1002/aenm.202204115· OSTI ID:1958819

^[1]; Uddin, Md Aslam ^[1]; Chen, Bo ^[1]; Ying, Xingjian ^[1]; Ni, Zhenyi ^[1]; Zhou, Ying ^[1]; Li, Mingze ^[1]; Wang, Mengru ^[1]; Yu, Zhenhua ^[1];

^[1]

University of North Carolina, Chapel Hill, NC (United States)

Abstract High‐performance tin‐lead perovskite solar cells (PSCs) are needed for all‐perovskite‐tandem solar cells. However, iodide related fast photodegradation severely limits the operational stability of Sn‐Pb perovskites despite the demonstrated high efficiency and thermal stability. Herein, this work employs an alkylammonium pseudo‐halogen additive to enhance the power conversion efficiency (PCE) and photostability of methylammonium (MA)‐free, Sn‐Pb PSCs. Density functional theory (DFT) calculations reveal that the pseudo‐halogen tetrafluoroborate (BF ₄ ⁻ ) has strong binding capacity with metal ions (Sn ²⁺ /Pb ²⁺ ) in the Sn‐Pb perovskite lattice, which lowers iodine vacancy formation. Upon combining BF ₄ ⁻ with an octylammonium (OA ⁺ ) cation, the PCE of the device with a built‐in light‐scattering layer is boosted to 23.7%, which represents a new record for Sn‐Pb PSCs. The improved efficiency benefits from the suppressed defect density. Under continuous 1 sun illumination, the OABF ₄ embodied PSCs show slower generation of interstitial iodides and iodine, which greatly improves the device photostability under open‐circuit condition. Moreover, the device based on OABF ₄ retains 88% of the initial PCE for 1000 h under the maximum‐power‐point tracking (MPPT) without cooling.

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Research Organization:: University of North Carolina, Chapel Hill, NC (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office; National Science Foundation (NSF)

Grant/Contract Number:: EE0008749; CCS-2050357

OSTI ID:: 1958819

Alternate ID(s):: OSTI ID: 1970790

Journal Information:: Advanced Energy Materials, Vol. 13, Issue 15; ISSN 1614-6832

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Enhancing Photostability of Sn-Pb Perovskite Solar Cells by an Alkylammonium Pseudo-Halogen Additive

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