Wang Shiyu, Shen Wenjian, Chu Yanmeng, Zhang Weihua, Hong Li, Mei Anyi, Rong Yaoguang, Tang Yiwen, Hu Yue, Han Hongwei
Department Nano-Science & Technology, College of Physics and Technology Central China Normal University (CCNU), Wuhan 430079, China.
Michael Grätzel Center for Mesoscopic Solar Cells (MGC), Wuhan National Laboratory for Optoelectronics (WNLO) Huazhong University of Science and Technology (HUST), Wuhan 430074, China.
J Phys Chem Lett. 2020 Nov 19;11(22):9689-9695. doi: 10.1021/acs.jpclett.0c02739. Epub 2020 Nov 2.
The all-inorganic CsPb(IBr) (0 ≤ ≤ 1) perovskite solar cells (PSCs) are attractive by virtue of their high environmental and thermal stability. Nevertheless, multiple-step deposition and high annealing temperature (>250 °C) and the structural and optoelectronic properties changes upon temperature-dependent phase-transition are potential impediments for highly efficient and stable PSCs. Herein, a space-confined method to fabricate stable lower-order symmetric pure monoclinic CsPbBr phase at low temperature (<50 °C) is for the first time reported. It is found that the carbon-based mesoporous fully printable area can inhibit the phase transition to get a pure phase. Therefore, the device exhibits a power conversion efficiency of 7.52% with a low hysteresis index of 0.024. Moreover, the device passed the 1000 h 85 °C thermal test and the 200 cycles thermal cycling test according to IEC-61625 stability tests. These are critical progresses for achieving long-term stability and the stable pure inorganic perovskite phase of high-performance photovoltaics.
全无机CsPb(IBr)₂（0 ≤ x ≤ 1）钙钛矿太阳能电池（PSC）因其高环境稳定性和热稳定性而备受关注。然而，多步沉积、高退火温度（>250°C）以及随温度变化的相变导致的结构和光电性能变化是高效稳定PSC的潜在障碍。在此，首次报道了一种在低温（<50°C）下制备稳定的低阶对称纯单斜相CsPbBr₃的空间限制方法。研究发现，碳基介孔完全可印刷区域可以抑制相变以获得纯相。因此，该器件的功率转换效率为7.52%，滞后指数低至0.024。此外，根据IEC-61625稳定性测试，该器件通过了1000小时85°C热测试和200次热循环测试。这些是实现高性能光伏器件长期稳定性和稳定纯无机钙钛矿相的关键进展。
