Gu Leilei, Wang Shubo, Fang Xiang, Liu Di, Xu Yibo, Yuan Ningyi, Ding Jianning
School of Materials Science and Engineering, Jiangsu Collaborative Innovation Center for Photovoltaic Science and Engineering, Jiangsu Province Cultivation Base for State Key Laboratory of Photovoltaic Science and Technology, Changzhou University, Changzhou 213164, China.
Micro/Nano Science and Technology Center, Jiangsu University, Zhenjiang 212013, China.
ACS Appl Mater Interfaces. 2020 Jul 29;12(30):33870-33878. doi: 10.1021/acsami.0c10830. Epub 2020 Jul 20.
Large-area devices with high power-conversion efficiency (PCE) are required for the further development of perovskite solar cells (PSCs). However, the major obstacle restricting the commercialization of large-area PSCs is the lack of reliable deposition technology for scalable perovskite thin films. Herein, a confined space sublimation method compatible with the preparation of a large-area perovskite film is introduced. First, pure PbX (X is I, Br, and Cl) films are exposed to CHNHI vapor, and the gas-solid reaction mechanisms for different lead halide layers are investigated; the perovskite films fabricated by retarded displacement between multiple halogens show large grains and a controllable band gap. Then, through mixed halogen adjustments of the PbX film, a maximum PCE of 20.44% (0.07 cm) for high-efficiency PSCs with large grains (over 2.0 μm) is obtained, while the fabrication of wide-band gap PSCs with a champion PCE of 17.99% (0.07 cm) verified the band gap-controlled compatibility of the confined space sublimation approach. Furthermore, the confined space sublimation approach is applied to fabricate large-area (6.75 cm) devices with uniform photovoltaic performance, demonstrating the scalable potential of this approach.
钙钛矿太阳能电池（PSC）的进一步发展需要具有高功率转换效率（PCE）的大面积器件。然而，限制大面积PSC商业化的主要障碍是缺乏用于可扩展钙钛矿薄膜的可靠沉积技术。在此，介绍一种与大面积钙钛矿薄膜制备兼容的受限空间升华方法。首先，将纯PbX（X为I、Br和Cl）薄膜暴露于CHNHI蒸气中，并研究不同卤化铅层的气固反应机制；通过多种卤素之间的延迟置换制备的钙钛矿薄膜显示出大晶粒和可控的带隙。然后，通过对PbX薄膜进行混合卤素调整，获得了具有大晶粒（超过2.0μm）的高效PSC的最大PCE为20.44%（0.07 cm²），而制备的具有17.99%（0.07 cm²）的冠军PCE的宽带隙PSC验证了受限空间升华方法的带隙可控兼容性。此外，受限空间升华方法被应用于制造具有均匀光伏性能的大面积（6.75 cm²）器件，证明了该方法的可扩展潜力。
