MgAc<sub>2</sub>-Modified SnO<sub>2</sub> Electron Transport Layer for Highly Efficient and Thermal Stable Perovskite Solar Cells.
basic_science · Level V
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- Record sourced from PubMed, PMID 39470984.
- Also identified by DOI 10.1021/acs.nanolett.4c02824.
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Abstract
There are always defects and oxygen vacancies in SnO<sub>2</sub> prepared by solution methods, hindering efficient carrier transfer between SnO<sub>2</sub> and the perovskite in perovskite solar cells. Thus, we employed MgAc<sub>2</sub> to modify the interface. Carboxyl groups of MgAc<sub>2</sub> filled the oxygen vacancies in SnO<sub>2</sub>, reducing its surface defect density, and Mg<sup>2+</sup> partially replaced surface Sn<sup>4+</sup>, improving the properties of the SnO<sub>2</sub> layer. Finally, perovskite solar cells modified with MgAc<sub>2</sub> exhibited a significant improvement in open-circuit voltage and fill factor, improving the power conversion efficiency from 20.52% to 22.02%. Moreover, MgAc<sub>2</sub>-devices maintained 80% of the initial efficiency after 1250 h in thermal stability tests at 85 °C and 30% relative humidity compared to control devices. This work provides a method for treating the SnO<sub>2</sub> electron transport layer and demonstrates the synergistic effects of Mg<sup>2+</sup> and acetate ions, which can facilitate the development of efficient and stable perovskite solar cells.