Arylammonium-Assisted Reduction of the Open-Circuit Voltage Deficit in Wide-Bandgap Perovskite Solar Cells: The Role of Suppressed Ion Migration

Chen, Cong; Song, Zhaoning; Xiao, Chuanxiao; Awni, Rasha A.; Yao, Canglang; Shrestha, Niraj; Li, Chongwen; Bista, Sandip Singh; Zhang, Yi; Chen, Lei; Ellingson, Randy J.; Jiang, Chun-Sheng; Al-Jassim, Mowafak; Fang, Guojia; Yan, Yanfa

doi:10.1021/acsenergylett.0c01350

Arylammonium-Assisted Reduction of the Open-Circuit Voltage Deficit in Wide-Bandgap Perovskite Solar Cells: The Role of Suppressed Ion Migration

Journal Article · Fri Jul 10 00:00:00 EDT 2020 · ACS Energy Letters

DOI:https://doi.org/10.1021/acsenergylett.0c01350· OSTI ID:1644254

Chen, Cong ^[1]; ^[2]; Xiao, Chuanxiao ^[3]; Awni, Rasha A. ^[2]; Yao, Canglang ^[2]; ^[2]; Li, Chongwen ^[2]; Bista, Sandip Singh ^[2]; Zhang, Yi ^[2]; Chen, Lei ^[2]; ^[2]; ^[3]; Al-Jassim, Mowafak ^[3]; ^[4]; ^[2]

Univ. of Toledo, OH (United States); Wuhan Univ. (China); University of Toledo
Univ. of Toledo, OH (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Wuhan Univ. (China)

Surface treatment using large alkyl/aryl ammonium cations has demonstrated reduced open-circuit voltage (V_OC) deficits in perovskite solar cells (PSCs), but the origin of the improvements has been vaguely attributed to defect passivation. Here, we combine the microscopic probing of the local electrical properties, thermal admittance spectroscopic analysis, and first principles calculations to elucidate the critical role of arylammonium interface layers on suppressing the ion migration in wide-bandgap (WBG) PSCs. Our results reveal that arylammonium surface treatment using phenethylammonium iodide increases the activation energy barrier for ion migration on the surface, which suppresses the accumulation of charge defects at surface and grain boundaries (GBs), leading to reduced dark saturation current density in WBG PSCs. Furthermore, with device optimization, our champion 1.73-eV PSC delivers a power conversion efficiency of 19.07% with a V_OC of 1.25 V, achieving a V_OC-deficit of 0.48 V.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Toledo, OH (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: EE0008753; AC36-08GO28308

OSTI ID:: 1644254

Alternate ID(s):: OSTI ID: 1677446

Journal Information:: ACS Energy Letters, Journal Name: ACS Energy Letters Vol. 5; ISSN 2380-8195

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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