<br>室温溶剂蒸发诱导结晶：应用勒夏特列原理生长卤化物钙钛矿单晶的一般策略,Small

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室温溶剂蒸发诱导结晶：应用勒夏特列原理生长卤化物钙钛矿单晶的一般策略
Small ( IF 13.0 ) Pub Date : 2023-08-23 , DOI: 10.1002/smll.202303687
Lei Gao ₁ , Xiuting Luo ₁ , Jia-Lin Sun ₂ , Qiang Li ₁ , Qingfeng Yan ₁

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高质量卤化物钙钛矿单晶的生长对于研究其内在物理性质和实现高性能光电器件至关重要。在此，报道了一种基于勒夏特列原理的室温溶剂蒸发诱导结晶（RTSEIC）方法，该方法提供了生长卤化物钙钛矿单晶的通用策略，包括3D、2D、1D和0D，以及混合或全-无机卤化物钙钛矿。以2D n -BA ₂ PbBr ₄ ( n -BA = 丁基铵)为例，演示了室温结晶动力学。厘米尺寸的n -BA ₂ PbBr ₄单晶在(0 0 2)面摇摆曲线中表现出极小的半峰全宽(FWHM)为0.024°以及2.74×10 ¹⁰ cm ^-3的小陷阱密度。优异的晶体质量使得n -BA ₂ PbBr ₄单晶紫外光电探测器在已报道的n -BA ₂ PbBr ₄紫外光电探测器中具有创纪录的性能，表现出高达1.8 × 10 ¹³ Jones的探测率、55 µs的快速响应时间和较高的灵敏度。开关比为10 ⁴ 。低成本、简单、通用、高效的RTSEIC方法有望促进卤化物钙钛矿单晶的全面开花。

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Room-Temperature Solvent Evaporation Induced Crystallization: A General Strategy for Growth of Halide Perovskite Single Crystals by Applying the Le Chatelier's Principle

The growth of high-quality halide perovskite single crystals is imperative to study their intrinsic physical properties and to realize high-performance optoelectronic devices. Here, a room-temperature solvent evaporation-induced crystallization (RTSEIC) method is reported based on Le Chatelier's principle, which provides a general strategy to grow halide perovskite single crystals including 3D, 2D, 1D, and 0D, and either hybrid or all-inorganic halide perovskites. Taking 2D n-BA₂PbBr₄ (n-BA = butylammonium) as an example, the room-temperature crystallization kinetics is demonstrated. The centimeter-sized n-BA₂PbBr₄ single crystals exhibit an extremely small full width at half maximum (FWHM) of 0.024° in (0 0 2) plane rocking curve and a small trap density of 2.74 × 10¹⁰ cm⁻³. The superior crystalline quality endows the n-BA₂PbBr₄ single crystal ultraviolet photodetectors with recorded performance among reported n-BA₂PbBr₄ ultraviolet photodetectors, demonstrating a detectivity reaching 1.8 × 10¹³ Jones, a fast response time of 55 µs and a high on-off ratio of 10⁴. The low-cost, simple, general, and efficient RTSEIC method is anticipated to promote the blossoming of halide perovskites single crystals.

更新日期：2023-08-23

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