Buried interface modulation via $\mathrm{PEDOT:PSS}$ ionic exchange for the Sn-Pb mixed perovskite based solar cells

Lee, Sangheon; Woo, Mun Young; Kim, Changyong; Kim, Kyung Won; Lee, Hyemin; Kang, Seok Beom; Im, Jeong Min; Jeong, Min Ju; Hong, Yunhwa; Yoon, Joo Woong; Kim, Sung Yong; Heo, Kwang; Zhu, Kai; Park, Ji-Sang; Noh, Jun Hong; Kim, Dong Hoe

doi:10.1016/j.cej.2023.147587

Title: Buried interface modulation via $$\mathrm{PEDOT:PSS}$$ ionic exchange for the Sn-Pb mixed perovskite based solar cells

Journal Article · 22 November 2023 · Chemical Engineering Journal

DOI: https://doi.org/10.1016/j.cej.2023.147587 · OSTI ID:2281370

Lee, Sangheon ^[1]; Woo, Mun Young ^[1]; Kim, Changyong ^[1]; Kim, Kyung Won ^[2];

^[1]; Kang, Seok Beom ^[1]; Im, Jeong Min ^[1]; Jeong, Min Ju; Hong, Yunhwa ^[2]; Yoon, Joo Woong ^[1]; Kim, Sung Yong ^[1]; Heo, Kwang ^[2]; Zhu, Kai ^[3];

^[4]; Noh, Jun Hong ^[1]; Kim, Dong Hoe ^[1]

Korea University, Seoul, (Korea, Republic of)
Sejong University, Seoul (Korea, Republic of)
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sungkyunkwan University, Suwon (Republic of Korea)

To apply Sn-Pb mixed perovskite solar cells for highly efficient single- or multi-junction devices, understanding device-specific buried interfaces is necessary. Poly [3,4-ethylenedioxythiophene]:poly[styrene sulfonate] (PEDOT:PSS) is primarily used as a hole transport layer in Sn-Pb mixed perovskite solar cells. However, the spatial heterogeneity of PEDOT:PSS, caused by its PEDOT-rich and PSS-rich domains, induces many defects at the buried interface in PEDOT:PSS/perovskite, which limits device performance. Here, we present ionic exchange (IE) of PEDOT:PSS via a combination of methylamine iodide (MAI) and dimethyl sulfoxide (DMSO). Through surface analyses and density functional theory (DFT) simulations, we confirm that the IE process preferentially form PEDOT-I and MA-PSS and that PSS-rich domains bind to DMSO. Thus, the spatial separation of PEDOT:PSS is solved, and the exchanged MA⁺ and I^- ions serve as a bridge between PEDOT:PSS and the perovskite, leading to improved physical, chemical, and electrical properties of the buried interface. The Sn-Pb mixed perovskite solar cells using IE-PEDOT:PSS achieve an improved efficiency of 21.3% with an open-circuit voltage of 0.85 V and show better long-term stability. Additionally, IE-PEDOT:PSS works effectively in 2-terminal all-perovskite tandem devices, resulting in an improved efficiency of 23.5% and high reproducibility.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office; National Research Foundation of Korea (NRF); Korea Institute of Energy Technology Evaluation and Planning (KETEP): Korea Electric Power Corporation

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 2281370

Report Number(s):: NREL/JA--5900-88175; MainId:88950; UUID:1dccadff-af14-44ad-a001-f1af74d48cfa; MainAdminID:71515

Journal Information:: Chemical Engineering Journal, Journal Name: Chemical Engineering Journal Vol. 479; ISSN 1385-8947

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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tandem solar cells

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