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Spherulitic Crystallization of CsCu2I3 for High Performance Ultraviolet Photodetectors
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2023-08-25 , DOI: 10.1021/acs.jpclett.3c01851 Wenbo Liu 1 , Mingda Li 1 , Chao Yang 1 , Nana Wang 1 , Wei Huang 1 , Renzhi Li 1 , Jianpu Wang 1, 2
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2023-08-25 , DOI: 10.1021/acs.jpclett.3c01851 Wenbo Liu 1 , Mingda Li 1 , Chao Yang 1 , Nana Wang 1 , Wei Huang 1 , Renzhi Li 1 , Jianpu Wang 1, 2
Affiliation
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Ternary copper halides have become promising materials for UV photodetection due to their stability and eco-friendliness. However, the uncontrollable crystallization induces high-concentration defects in these films, inherently limiting further improvement in device performance. Herein, we reveal the antisolvent-assisted crystallization kinetics mechanism of CsCu2I3 during the film-forming process. The nucleation rate is manipulated by adjusting precursor supersaturation using different antisolvents, resulting in decreased density and preferential orientation of the nuclei within the wet film. Subsequent annealing leads to a homogeneous and low-defect CsCu2I3 film with 40-μm-scale spherulites. A resulting visible-blind ultraviolet photodetector exhibits a responsivity of 8.73 A W–1, a specific detectivity of 5.28 × 1012 jones, and a response speed of 1.12 ms. The unencapsulated photodetector shows negligible degradation of responsivity in ambient air (∼70% humidity) for one month. Moreover, the flexible device with a responsivity of 420.2 mA W–1 and a detectivity of 1.18 × 1012 jones also shows excellent bending stability.
中文翻译：
用于高性能紫外光电探测器的 CsCu2I3 球晶结晶
三元卤化铜由于其稳定性和环保性而成为紫外光电检测领域有前景的材料。然而，不可控的结晶会导致这些薄膜中出现高浓度缺陷，从本质上限制了器件性能的进一步提高。在此，我们揭示了CsCu 2 I 3成膜过程中反溶剂辅助结晶动力学机制。通过使用不同的反溶剂调整前体过饱和度来控制成核速率，从而导致湿膜内核的密度降低和择优取向。随后的退火产生具有 40 μm 级球晶的均匀且低缺陷的 CsCu 2 I 3薄膜。由此产生的可见盲紫外光电探测器的响应率为8.73 AW –1，比探测率为5.28 × 10 12琼斯，响应速度为1.12 ms。未封装的光电探测器在环境空气（~70% 湿度）中一个月内的响应度下降可以忽略不计。此外，响应度为420.2 mA W –1、探测灵敏度为1.18 × 10 12琼斯的柔性器件还表现出优异的弯曲稳定性。
更新日期：2023-08-25
中文翻译：
用于高性能紫外光电探测器的 CsCu2I3 球晶结晶
三元卤化铜由于其稳定性和环保性而成为紫外光电检测领域有前景的材料。然而，不可控的结晶会导致这些薄膜中出现高浓度缺陷，从本质上限制了器件性能的进一步提高。在此，我们揭示了CsCu 2 I 3成膜过程中反溶剂辅助结晶动力学机制。通过使用不同的反溶剂调整前体过饱和度来控制成核速率，从而导致湿膜内核的密度降低和择优取向。随后的退火产生具有 40 μm 级球晶的均匀且低缺陷的 CsCu 2 I 3薄膜。由此产生的可见盲紫外光电探测器的响应率为8.73 AW –1，比探测率为5.28 × 10 12琼斯，响应速度为1.12 ms。未封装的光电探测器在环境空气（~70% 湿度）中一个月内的响应度下降可以忽略不计。此外，响应度为420.2 mA W –1、探测灵敏度为1.18 × 10 12琼斯的柔性器件还表现出优异的弯曲稳定性。
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