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Crystal Growth Regulation of α-FAPbI3 Perovskite Films for High-Efficiency Solar Cells with Long-Term Stability
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-03-21 , DOI: 10.1002/adfm.202214834 Shiheng Wang 1 , Huaiqing Luo 1 , Zhenkun Gu 1 , Rudai Zhao 1 , Lutong Guo 1, 2 , Na Wang 1 , Yunjie Lou 1 , Qun Xu 1 , Shou Peng 3, 4 , Yiqiang Zhang 1 , Yanlin Song 2
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-03-21 , DOI: 10.1002/adfm.202214834 Shiheng Wang 1 , Huaiqing Luo 1 , Zhenkun Gu 1 , Rudai Zhao 1 , Lutong Guo 1, 2 , Na Wang 1 , Yunjie Lou 1 , Qun Xu 1 , Shou Peng 3, 4 , Yiqiang Zhang 1 , Yanlin Song 2
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The two-step sequentially deposition strategy has been widely used to produce high-performance FAPbI3-based solar cells. However, due to the rapid reaction between PbI2 and FAI, a dense perovskite film forms on top of the PbI2 layer immediately and blocks the FAI diffusion into the bottom of the PbI2 film for a complete reaction, which results in a low-efficiency and limited reproducibility of perovskite solar cells (PSCs). Here, high-quality α-FAPbI3 perovskite films by crystal growth regulation with 4-fluorobenzamide additives is fabricated. The additives can interact with FAI to suppress the fast reaction between the FAI and PbI2 and effectively passivate the under-coordinated Pb2+ or I- defects. As a result, α-FAPbI3 perovskite films with low trap density and large grain size are prepared. The modified PSCs present a high-power conversion efficiency of 24.08%, maintaining 90% of their initial efficiency after 1400 h in high humidity. This study provides an efficient strategy of synergistic crystallization and passivation to form high-quality α-FAPbI3 films for high-performance PSCs.
中文翻译：
用于长期稳定的高效太阳能电池的 α-FAPbI3 钙钛矿薄膜的晶体生长调控
两步顺序沉积策略已广泛用于生产高性能 FAPbI 3基太阳能电池。然而，由于 PbI 2和 FAI 之间的快速反应，致密的钙钛矿薄膜立即在 PbI 2层的顶部形成并阻止 FAI 扩散到 PbI 2薄膜底部以进行完全反应，从而导致低-钙钛矿太阳能电池 (PSC) 的效率和有限的可重复性。在这里，通过晶体生长调节和 4-氟苯甲酰胺添加剂制造了高质量的 α-FAPbI 3钙钛矿薄膜。该添加剂可与FAI相互作用，抑制FAI与PbI 2的快速反应，有效钝化配位不足的Pb2+或 I -缺陷。结果，制备了具有低陷阱密度和大晶粒尺寸的α-FAPbI 3钙钛矿薄膜。改进后的 PSC 具有 24.08% 的高功率转换效率，在高湿度条件下 1400 小时后仍保持其初始效率的 90%。该研究提供了一种协同结晶和钝化的有效策略，以形成用于高性能 PSC 的高质量 α-FAPbI 3薄膜。
更新日期：2023-03-26
中文翻译：
用于长期稳定的高效太阳能电池的 α-FAPbI3 钙钛矿薄膜的晶体生长调控
两步顺序沉积策略已广泛用于生产高性能 FAPbI 3基太阳能电池。然而，由于 PbI 2和 FAI 之间的快速反应，致密的钙钛矿薄膜立即在 PbI 2层的顶部形成并阻止 FAI 扩散到 PbI 2薄膜底部以进行完全反应，从而导致低-钙钛矿太阳能电池 (PSC) 的效率和有限的可重复性。在这里，通过晶体生长调节和 4-氟苯甲酰胺添加剂制造了高质量的 α-FAPbI 3钙钛矿薄膜。该添加剂可与FAI相互作用，抑制FAI与PbI 2的快速反应，有效钝化配位不足的Pb2+或 I -缺陷。结果，制备了具有低陷阱密度和大晶粒尺寸的α-FAPbI 3钙钛矿薄膜。改进后的 PSC 具有 24.08% 的高功率转换效率，在高湿度条件下 1400 小时后仍保持其初始效率的 90%。该研究提供了一种协同结晶和钝化的有效策略，以形成用于高性能 PSC 的高质量 α-FAPbI 3薄膜。
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