Incorporating Potassium Citrate to Improve the Performance of Tin‐Lead Perovskite Solar Cells

Chen, Lei; Li, Chongwen; Xian, Yeming; Fu, Sheng; Abudulimu, Abasi; Li, Deng‐Bing; Friedl, Jared D.; Li, You; Neupane, Sabin; Tumusange, Marie Solange; Sun, Nannan; Wang, Xiaoming; Ellingson, Randy J.; Heben, Michael J.; Podraza, Nikolas J.; Song, Zhaoning; Yan, Yanfa

doi:10.1002/aenm.202301218

Title: Incorporating Potassium Citrate to Improve the Performance of Tin‐Lead Perovskite Solar Cells

Journal Article · 12 July 2023 · Advanced Energy Materials

DOI: https://doi.org/10.1002/aenm.202301218 · OSTI ID:1989497

Chen, Lei ^[1]; Li, Chongwen ^[1]; Xian, Yeming ^[1]; Fu, Sheng ^[1]; Abudulimu, Abasi ^[1]; Li, Deng‐Bing ^[1]; Friedl, Jared D. ^[1]; Li, You ^[1]; Neupane, Sabin ^[1]; Tumusange, Marie Solange ^[1]; Sun, Nannan ^[1]; Wang, Xiaoming ^[1]; Ellingson, Randy J. ^[1]; Heben, Michael J. ^[1]; Podraza, Nikolas J. ^[1];

^[1]; Yan, Yanfa ^[1]

Department of Physics and Astronomy and Wright Center for Photovoltaics Innovation and Commercialization The University of Toledo 2801 W. Bancroft Street Toledo OH 43606 USA

Abstract Easy‐to‐form tin vacancies at the buried interface of tin‐lead perovskites hinder the performance of low‐bandgap perovskite solar cells (PSCs). Here, a synergistic strategy by incorporating potassium citrate (PC) into the poly(3,4‐ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) hole‐transport layer to passivate the buried interface of Sn‐Pb PSCs is reported. PC neutralizes the acidity of PEDOT:PSS and stabilizes the perovskite front surface, enhancing device stability. Citrate moieties coordinate with Sn ²⁺ on the buried perovskite surface, preventing Sn ²⁺ oxidation and suppressing defect formation. Additionally, potassium cations incorporate into Sn‐Pb perovskites, enhancing crystallinity and passivating halide defects. The combined benefits enable efficient low‐bandgap Sn‐Pb PSCs with a power conversion efficiency of 22.7% and a high open‐circuit voltage of 0.894 V. Using this method, 26.1% efficiency for all‐perovskite tandem solar cells is demonstrated. These results emphasize the significance of buried interface passivation in developing efficient and stable Sn‐Pb PSCs and all‐perovskite tandem solar cells.

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

Sponsoring Organization:: US Air Force Office of Scientific Research (AFOSR); USDOE; 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:: EE0008753; EE0008837

OSTI ID:: 1989497

Journal Information:: Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 32 Vol. 13; ISSN 1614-6832

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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14 SOLAR ENERGY
all-perovskite tandem solar cells
buried interface
defect passivation
low-bandgap perovskites

Title: Incorporating Potassium Citrate to Improve the Performance of Tin‐Lead Perovskite Solar Cells

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