Formamidinium lead triiodide quantum dot (FAPbI₃ QD) exhibits substantial potential in solar cells due to its suitable band gap, extended carrier lifetime, and superior phase stability. However, despite great attempts toward reconfiguring the surface chemical environment of FAPbI₃ QDs, achieving the optimal efficiency of charge carrier extraction and transfer in cells remains a challenge. To circumvent this problem, we selectively introduced Au/FAPbI₃ Schottky heterojunctions by reducing Au⁺ to Au⁰ and subsequently anchoring them on the surface of FAPbI₃ QDs, which acts as a light-harvesting layer and establishes high-speed electron transfer channels (Au dot ↔ Au dot). As a result, the champion photoelectric conversion efficiency of solar cells reached 13.68%, a significant improvement over 11.19% of that of FAPbI₃-based solar cells. The enhancement is attributed to efficient and directed electron transfer as well as a more aligned energy level arrangement. This work constructed Au/FAPbI₃ QD Schottky heterojunctions, providing a viable strategy to enhance QD electron coupling for high-performance optoelectronic applications.

中文翻译：

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为高性能钙钛矿量子点太阳能电池构建高速电子传输通道的 Au/FAPbI3 肖特基异质结


三碘化甲脒铅量子点（FAPbI ₃ QD）由于其合适的带隙、延长的载流子寿命和优异的相稳定性，在太阳能电池中表现出巨大的潜力。然而，尽管人们在重新配置 FAPbI ₃ QD 的表面化学环境方面做出了巨大的努力，但实现细胞中电荷载流子提取和转移的最佳效率仍然是一个挑战。为了解决这个问题，我们通过将 Au ⁺ 还原为 Au ⁰ 来选择性地引入 Au/FAPbI ₃ 肖特基异质结，然后将它们锚定在 FAPbI ₃ QD，充当光捕获层并建立高速电子传输通道（Au dot ↔ Au dot）。结果，冠军太阳能电池的光电转换效率达到13.68%，比基于FAPbI ₃ 的太阳能电池的11.19%有了显着提高。这种增强归因于高效和定向的电子转移以及更对齐的能级排列。这项工作构建了 Au/FAPbI ₃ QD 肖特基异质结，为增强高性能光电应用的 QD 电子耦合提供了可行的策略。