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Space‐Confined Growth of CsPbBr3 Film Achieving Photodetectors with High Performance in All Figures of Merit
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-09-10 , DOI: 10.1002/adfm.201804394
Junpeng Zeng 1, 2 , Xiaoming Li 1 , Ye Wu 1 , Dandan Yang 1 , Zhiguo Sun 1 , Zehao Song 2 , Hao Wang 2 , Haibo Zeng 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-09-10 , DOI: 10.1002/adfm.201804394
Junpeng Zeng 1, 2 , Xiaoming Li 1 , Ye Wu 1 , Dandan Yang 1 , Zhiguo Sun 1 , Zehao Song 2 , Hao Wang 2 , Haibo Zeng 1
Affiliation
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All‐inorganic halide perovskite is considered as outstanding candidate of organic–inorganic hybrid perovskite due to its superior stability. However, the low solubility of precursor and uncontrollable film growth result in poor film quality and impede the application of polycrystalline films greatly. In this work it is reported on a space‐confined growth strategy to overcome the low solubility and fast crystal growth disadvantages via freezing the precursor solution within the gaps of ordered polystyrene sphere templates. Then, the dense CsPbBr3 polycrystalline films realize low trap density (3.07 × 1012 cm−3) and high carrier mobility (9.27 cm2 V−1 s−1) after stoichiometric modulation. Photodetectors based on these films exhibit high performance in all figures of merit. Specifically, high responsivity up to 216 A W−1 and ultrashort response time (<5 µs) are achieved, which are better than those of all the CsPbBr3 based PDs. A record detectivity of 7.55 × 1013 and 3.1 × 105 Hz −3 dB bandwidth are also achieved. This work opens the window of high quality all‐inorganic halide perovskite polycrystalline films and can be extended to rational application of more optoelectronic devices including solar cells, photoelectrodes, and ray detectors.
中文翻译:
CsPbBr3薄膜的空间限制生长可实现所有性能优异的光电探测器
由于其优异的稳定性,全无机卤化物钙钛矿被认为是有机-无机杂化钙钛矿的杰出候选者。然而,前体的低溶解度和不可控的膜生长导致膜质量差,并且极大地阻碍了多晶膜的应用。在这项工作中,报道了一种空间受限的生长策略,该方法通过将前体溶液冻结在有序聚苯乙烯球模板的间隙内来克服低溶解度和快速晶体生长的缺点。然后,致密的CsPbBr 3多晶膜实现了低陷阱密度(3.07×10 12 cm -3)和高载流子迁移率(9.27 cm 2 V -1 s -1)化学计量调制后)。基于这些薄膜的光电探测器在所有性能指标上均表现出高性能。具体而言,实现了高达216 AW -1的高响应度和超短响应时间(<5 µs),这优于所有基于CsPbBr 3的PD。还实现了7.55×10 13和3.1×10 5 Hz -3 dB带宽的记录检测率。这项工作打开了高质量全无机卤化物钙钛矿多晶膜的窗口,并且可以扩展到更多光电器件的合理应用,包括太阳能电池,光电电极和射线探测器。
更新日期:2018-09-10
中文翻译:
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CsPbBr3薄膜的空间限制生长可实现所有性能优异的光电探测器
由于其优异的稳定性,全无机卤化物钙钛矿被认为是有机-无机杂化钙钛矿的杰出候选者。然而,前体的低溶解度和不可控的膜生长导致膜质量差,并且极大地阻碍了多晶膜的应用。在这项工作中,报道了一种空间受限的生长策略,该方法通过将前体溶液冻结在有序聚苯乙烯球模板的间隙内来克服低溶解度和快速晶体生长的缺点。然后,致密的CsPbBr 3多晶膜实现了低陷阱密度(3.07×10 12 cm -3)和高载流子迁移率(9.27 cm 2 V -1 s -1)化学计量调制后)。基于这些薄膜的光电探测器在所有性能指标上均表现出高性能。具体而言,实现了高达216 AW -1的高响应度和超短响应时间(<5 µs),这优于所有基于CsPbBr 3的PD。还实现了7.55×10 13和3.1×10 5 Hz -3 dB带宽的记录检测率。这项工作打开了高质量全无机卤化物钙钛矿多晶膜的窗口,并且可以扩展到更多光电器件的合理应用,包括太阳能电池,光电电极和射线探测器。