Regulating the crystalline phase of intermediate films enables FA1−xMAxPbI3 perovskite solar cells with efficiency over 22%,Journal of Materials Chemistry A

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Regulating the crystalline phase of intermediate films enables FA1−xMAxPbI3 perovskite solar cells with efficiency over 22%
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2021-10-08 , DOI: 10.1039/d1ta06410j
Fa-Zheng Qiu _{1,

2} , Ming-Hua Li ₂ , Shuo Wang _{1,

2} , Jia-Yi Sun ₁ , Yan Jiang ₃ , Jun-Jie Qi ₁ , Jin-Song Hu _{2,

4}

Affiliation

The sequential deposition method has achieved great success in the preparation of high-performance perovskite solar cells. Nevertheless, the crystalline phase of intermediate films which determines the quality of perovskite films and the corresponding device performance is yet to be fully understood. In this work, we show that FA_1−xMA_xPbI₃ perovskite intermediate films prepared in ambient air are δ phase, which after annealing, present preferable orientation, higher crystallinity, longer photoluminescence carrier lifetime, and lower trap density than those obtained from α phase intermediate films. By integrating fully ambient-prepared perovskite films into planar heterojunction solar cells, a champion power conversion efficiency of 22.09% (steady-state efficiency of 21.03%) is achieved. Moreover, the unencapsulated device maintains 92.4% of its original efficiency after aging for 1200 h in ambient air (30 ± 5% relative humidity, 25 ± 5 °C, dark). This study provides new insight into preparation of high-quality perovskite films and solar cells.

中文翻译：

调节中间膜的结晶相使 FA1−xMAxPbI3 钙钛矿太阳能电池的效率超过 22%

序贯沉积法在制备高性能钙钛矿太阳能电池方面取得了巨大成功。然而，决定钙钛矿薄膜质量和相应器件性能的中间薄膜的结晶相尚未完全了解。在这项工作中，我们表明 FA _{1− x} MA _x PbI ₃在环境空气中制备的钙钛矿中间膜为δ相，与α相中间膜相比，退火后具有更好的取向、更高的结晶度、更长的光致发光载流子寿命和更低的陷阱密度。通过将完全在环境中制备的钙钛矿薄膜集成到平面异质结太阳能电池中，实现了 22.09% 的最佳功率转换效率（稳态效率为 21.03%）。此外，未封装的器件在环境空气（30 ± 5% 相对湿度，25 ± 5 °C，黑暗）中老化 1200 小时后仍保持其原始效率的 92.4%。这项研究为制备高质量钙钛矿薄膜和太阳能电池提供了新的见解。

更新日期：2021-10-25

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