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<p>Organic-inorganic hybrid perovskite materials have garnered significant attention in photovoltaics due to their exceptional optoelectronic properties. However, the commercial viability of perovskite solar cells (PSCs) remains hindered by interfacial instability and charge recombination losses at the SnO<sub>2</sub> electron transport layer (ETL). To address these issues, we developed a molecular interface engineering strategy by modifying the SnO<sub>2</sub> ETL with 1-ethyl-3-methylimidazolium thiocyanate (EMISCN). Comprehensive optoelectrical characterization, including photoluminescence (PL), time-resolved PL (TRPL), and space-charge-limited current (SCLC) measurements, confirms that the EMISCN modification effectively passivates interface defects, and enhances electron extraction. Consequently, the EMISCN-modified devices achieved a champion power conversion efficiency (PCE) of 24.2%, a significant improvement over the 22.8% efficiency of the control devices. Moreover, the EMISCN-modified PSCs exhibit improved stability under dark storage at 25 ± 10 °C and 25 ± 10 % RH, retaining around 85% of their initial PCE after 1200 hours, compared with only about 61% retention for the unmodified devices. These findings underscore the dual benefit of EMISCN in enhancing both efficiency and stability, paving a promising path toward the development of commercially viable PSCs.</p>

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Enhancing the performance and stability of perovskite solar cells with SnO2 modification

  • 期刊论文

  • 发表日期：

    2026年2月23日

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  • Enjia Jiang,
  • Shumao Wang,
  • Hewei Wang,
  • Yujian Huang,
  • Yuhua Dai,
  • Yan Lei,
  • Yanyan Fang,
  • Yuan Lin

摘要

Organic-inorganic hybrid perovskite materials have garnered significant attention in photovoltaics due to their exceptional optoelectronic properties. However, the commercial viability of perovskite solar cells (PSCs) remains hindered by interfacial instability and charge recombination losses at the SnO2 electron transport layer (ETL). To address these issues, we developed a molecular interface engineering strategy by modifying the SnO2 ETL with 1-ethyl-3-methylimidazolium thiocyanate (EMISCN). Comprehensive optoelectrical characterization, including photoluminescence (PL), time-resolved PL (TRPL), and space-charge-limited current (SCLC) measurements, confirms that the EMISCN modification effectively passivates interface defects, and enhances electron extraction. Consequently, the EMISCN-modified devices achieved a champion power conversion efficiency (PCE) of 24.2%, a significant improvement over the 22.8% efficiency of the control devices. Moreover, the EMISCN-modified PSCs exhibit improved stability under dark storage at 25 ± 10 °C and 25 ± 10 % RH, retaining around 85% of their initial PCE after 1200 hours, compared with only about 61% retention for the unmodified devices. These findings underscore the dual benefit of EMISCN in enhancing both efficiency and stability, paving a promising path toward the development of commercially viable PSCs.