Suppressed deprotonation enables a durable buried interface in tin-lead perovskite for all-perovskite tandem solar cells

Fu, Sheng; Sun, Nannan; Xian, Yeming; Chen, Lei; Li, You; Li, Chongwen; Abudulimu, Abasi; Kaluarachchi, Prabodika N.; Huang, Zixu; Wang, Xiaoming; Dolia, Kshitiz; Ginger, David S.; Heben, Michael J.; Ellingson, Randy J.; Chen, Bin; Sargent, Edward H.; Song, Zhaoning; Yan, Yanfa

doi:10.1016/j.joule.2024.05.007

Suppressed deprotonation enables a durable buried interface in tin-lead perovskite for all-perovskite tandem solar cells

Journal Article · Wed Jun 05 00:00:00 EDT 2024 · Joule

DOI:https://doi.org/10.1016/j.joule.2024.05.007· OSTI ID:2434276

Fu, Sheng ^[1]; Sun, Nannan ^[2]; Xian, Yeming ^[2]; Chen, Lei ^[2]; Li, You ^[2]; Li, Chongwen ^[3]; Abudulimu, Abasi ^[2]; Kaluarachchi, Prabodika N. ^[2]; Huang, Zixu ^[4]; Wang, Xiaoming ^[2]; Dolia, Kshitiz ^[2]; Ginger, David S. ^[5]; Heben, Michael J. ^[2]; Ellingson, Randy J. ^[2]; Chen, Bin ^[3]; Sargent, Edward H. ^[3]; ^[2]; Yan, Yanfa ^[2]

University of Toledo, OH (United States); University of Toledo
University of Toledo, OH (United States)
Northwestern University, Evanston, IL (United States)
University of Washington, Seattle, WA (United States)
University of Washington, Seattle, WA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Low-band-gap tin (Sn)-lead (Pb) perovskites are a critical component in all-perovskite tandem solar cells (APTSCs). Current state-of-the-art Sn-Pb perovskite devices exclusively use poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) as the hole-transport layer (HTL) but suffer from undesired buried-interface degradation. Here, we show that the deprotonation of the –SO₃H group in PSS is the root cause of the interface degradation due to its low acid dissociation constant (pK_a), leading to acidic erosion and iodine volatilization in Sn-Pb perovskites. We identify that HTL featuring the carboxyl (–COOH) group with a higher pK_a, such as poly[3-(4-carboxybutyl)thiophene-2,5-diyl] (P3CT), can suppress deprotonation and strengthen the interface, mitigating the buried-interface degradation. Motivated by established P3CT modification, we introduce Pb doping to P3CT to increase its work function and reduce interfacial energy loss. Furthermore, we fabricate APTSCs with a champion efficiency of 27.8% and an operational lifetime of over 1,000 h, with 97% retaining efficiency under maximum power point tracking.

View Accepted Manuscript (DOE)

Research Organization:: University of Toledo, OH (United States)

Sponsoring Organization:: NERSC; U.S. Air Force Research Laboratory; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Hydrogen Fuel Cell Technologies Office (HFTO); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office

Grant/Contract Number:: AC02-05CH11231; EE0008753; EE0008837; EE0010740

OSTI ID:: 2434276

Journal Information:: Joule, Journal Name: Joule Journal Issue: 8 Vol. 8; ISSN 2542-4351

Publisher:: Elsevier - Cell PressCopyright Statement

Country of Publication:: United States

Language:: English

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Suppressed deprotonation enables a durable buried interface in tin-lead perovskite for all-perovskite tandem solar cells

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