Incorporating Potassium Citrate to Improve the Performance of Tin‐Lead Perovskite Solar Cells
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 Sn2+ on the buried perovskite surface, preventing Sn2+ 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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 13, 2023
- Source ID
- 10.1002/aenm.202301218
Entities
People
- Abasi Abudulimu
- Chongwen Li
- Deng‐Bing Li
- Jared D. Friedl
- Lei Chen
- Marie Solange Tumusange
- Michael J. Heben
- Nannan Sun
- Nikolas J. Podraza
- Randy J Ellingson
- Sabin Neupane
- Sheng Fu
- Xiaoming Wang
- Yanfa Yan
- Yeming Xian
- You Li
- Zhaoning Song
Organizations
- Air Force Research Laboratory
- Fuel Cell Technologies Office
- Office of Energy Efficiency and Renewable Energy
- Solar Energy Technologies Office
- United States Department of Energy
- University of Toledo