Interface Regulation for Efficient and Stable Perovskite Solar Cells through Potassium Citrate Molecules

Xiaodan Tang; Bo Li; Mengmeng Chen; Miao Li; Yuanyuan Zhou; Lulu Jiang; Hairui Liu

doi:10.1002/chem.202300170

Interface Regulation for Efficient and Stable Perovskite Solar Cells through Potassium Citrate Molecules

Chemistry. 2023 May 16;29(28):e202300170. doi: 10.1002/chem.202300170. Epub 2023 Apr 3.

Authors

Xiaodan Tang¹, Bo Li¹, Mengmeng Chen¹, Miao Li¹, Yuanyuan Zhou¹, Lulu Jiang¹, Hairui Liu¹

Affiliation

¹ School of Materials Science and Engineering, Henan Normal University, Xinxiang, Henan, 453007, P. R. China.

PMID: 36867018
DOI: 10.1002/chem.202300170

Abstract

Efficiency and stability are key factors determining the final cost of electricity that perovskite solar cells (PSCs) generate. To date, effective strategy to progress in achieving efficient and stable PSCs is still a difficult problem that researchers continue to explore. This study reports a useful way to improve the quality of SnO₂ film by introducing potassium citrate (PC) into SnO₂ nanoparticles solution. PC passivates interface defects between perovskite and SnO₂ layers via the interactions of functional groups (K⁺ , -COO^- ) in PC with undersaturated Pb and I ions in perovskite and Sn⁴⁺ in SnO₂ . The resultant photovoltaic (PV) device achieves a champion power conversion efficiency (PCE) of 22.79 %. The introduction of PC interface also significantly suppress the degradation of PSCs, by which 87.6 % of initial PCE is maintained after 2850 h storage in ambient environment. Moreover, the devices retained 95.5 % of initial PCE under 1-sun continuous illumination for 1000 h.

Keywords: efficiency; interface passivation; perovskite solar cells; potassium citrate; stability.

Abstract

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