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<p>MAPbI<sub>3</sub> perovskite solar cells (PSCs) exhibit a theoretical open-circuit voltage (<i>V</i><sub>OC</sub>) of approximately 1.3 V, and minimizing <i>V</i><sub>OC</sub> loss is crucial for enhancing their performance. Herein, we focus on MAPbI<sub>3</sub> PSCs to inhibit the interfacial charge recombination and voltage loss through synergistic energy-level grading and lattice matching. The synthesized SrTiO<sub>3</sub> nanocubes were incorporated into the TiO<sub>2</sub> electron transport layer to effectively achieve optimal energy alignment with the conduction band of MAPbI<sub>3</sub>, to reduce charge carrier energy loss, and improve carrier extraction. Furthermore, the small lattice mismatch between the perovskite structures of SrTiO<sub>3</sub> and MAPbI<sub>3</sub> promoted the growth of high-quality perovskite films with reduced defect density. As a result, the <i>V</i><sub>OC</sub> of the MAPbI<sub>3</sub> PSCs was increased to 1.17 V, and the power conversion efficiency reached 22.19%. This work provides an effective approach to interface optimization to emphasize the energy-level grading and lattice matching in minimizing <i>V</i><sub>OC</sub> loss and improving the performance of MAPbI<sub>3</sub> PSCs.</p>

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Minimizing open-circuit voltage loss in perovskite solar cells through synergistic energy-level grading and lattice matching

  • 期刊论文

  • 发表日期：

    2025年7月24日

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  • Wei Liu,
  • Xin Huang,
  • Qishuo Li,
  • Qifu Yao,
  • Diao Zhang,
  • Tingxue Zhou,
  • Xing’ao Li,
  • Liang Chu

摘要

MAPbI3 perovskite solar cells (PSCs) exhibit a theoretical open-circuit voltage (VOC) of approximately 1.3 V, and minimizing VOC loss is crucial for enhancing their performance. Herein, we focus on MAPbI3 PSCs to inhibit the interfacial charge recombination and voltage loss through synergistic energy-level grading and lattice matching. The synthesized SrTiO3 nanocubes were incorporated into the TiO2 electron transport layer to effectively achieve optimal energy alignment with the conduction band of MAPbI3, to reduce charge carrier energy loss, and improve carrier extraction. Furthermore, the small lattice mismatch between the perovskite structures of SrTiO3 and MAPbI3 promoted the growth of high-quality perovskite films with reduced defect density. As a result, the VOC of the MAPbI3 PSCs was increased to 1.17 V, and the power conversion efficiency reached 22.19%. This work provides an effective approach to interface optimization to emphasize the energy-level grading and lattice matching in minimizing VOC loss and improving the performance of MAPbI3 PSCs.