Crystallization Control Based on the Regulation of Solvent–Perovskite Coordination for High-Performance Ambient Printable FAPbI3 Perovskite Solar Cells,Advanced Materials

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Crystallization Control Based on the Regulation of Solvent–Perovskite Coordination for High-Performance Ambient Printable FAPbI3 Perovskite Solar Cells
Advanced Materials ( IF 27.4 ) Pub Date : 2023-10-12 , DOI: 10.1002/adma.202307583
Yachao Du ₁ , Qingwen Tian ₁ , Shiqiang Wang ₁ , Lei Yin ₁ , Chuang Ma ₁ , Zhiteng Wang ₁ , Lei Lang ₁ , Yingguo Yang ₂ , Kui Zhao ₁ , Shengzhong Frank Liu _{1,

3,

4}

Affiliation

The critical requirement for ambient-printed formamidinium lead iodide (FAPbI₃) lies in the control of nucleation–growth kinetics and defect formation behavior, which are extensively influenced by interactions between the solvent and perovskite. Here, a strategy is developed that combines a cosolvent and an additive to efficiently tailor the coordination between the solvent and perovskite. Through in situ characterizations, the direct crystallization from the sol–gel phase to α-FAPbI₃ is illustrated. When the solvent exhibits strong interactions with the perovskite, the sol–gel phases cannot effectively transform into α-FAPbI₃, resulting in a lower nucleation rate and confined crystal growth directions. Consequently, it becomes challenging to fabricate high-quality void-free perovskite films. Conversely, weaker solvent–perovskite coordination promotes direct crystallization from sol–gel phases to α-FAPbI₃. This process exhibits more balanced nucleation–growth kinetics and restrains the formation of defects and microstrains in situ. This strategy leads to improved structural and optoelectronic properties within the FAPbI₃ films, characterized by more compact grain stacking, smoother surface morphology, released lattice strain, and fewer defects. The ambient-printed FAPbI₃ perovskite solar cells fabricated using this strategy exhibit a remarkable power conversion efficiency of 24%, with significantly reduced efficiency deviation and negligible decreases in the stabilized output.

中文翻译：

基于溶剂-钙钛矿配位调节的高性能常温可印刷 FAPbI3 钙钛矿太阳能电池的结晶控制

环境印刷甲脒碘化铅（FAPbI ₃ ）的关键要求在于控制成核-生长动力学和缺陷形成行为，这些行为受到溶剂和钙钛矿之间相互作用的广泛影响。在这里，开发了一种策略，将共溶剂和添加剂结合起来，以有效地调整溶剂和钙钛矿之间的配位。通过原位表征，说明了从溶胶-凝胶相到α-FAPbI ₃的直接结晶。当溶剂与钙钛矿表现出强烈的相互作用时，溶胶-凝胶相不能有效地转化为α-FAPbI ₃ ，导致较低的成核速率和受限的晶体生长方向。因此，制造高质量的无空隙钙钛矿薄膜变得具有挑战性。相反，较弱的溶剂-钙钛矿配位促进从溶胶-凝胶相直接结晶为α-FAPbI ₃ 。该过程表现出更平衡的成核-生长动力学，并抑制原位缺陷和微应变的形成。这种策略改善了 FAPbI ₃薄膜的结构和光电性能，其特点是晶粒堆积更紧密、表面形态更光滑、晶格应变释放和缺陷更少。使用这种策略制造的常温印刷的 FAPbI ₃钙钛矿太阳能电池表现出高达 24% 的显着功率转换效率，效率偏差显着降低，稳定输出的下降可以忽略不计。

更新日期：2023-10-12

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