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Space-confined growth of high-quality CsBi 3 I 10 lead-free perovskite film for near-infrared photodetectors with high sensitivity and stability
Science China Materials ( IF 6.8 ) Pub Date : 2020-10-09 , DOI: 10.1007/s40843-020-1447-3
Ronghuan Liu , Hai Zhou , Rui Wang , Dingjun Wu , Xiyan Pan , Guangdong Pan , Hao Wang

As a lead-free perovskite, CsBi3I10 has attracted significant attention because of its high thermal tolerance and long electron diffusion length. Solution-processed high-performance CsBi3I10 perovskite devices, however, are hindered by the formation of a two-dimensional structure, which results in an extremely high surface roughness and many pinholes. In this paper, we reported a space-confined growth (SCG) method using a single-layer polystyrene (PS) sphere template to obtain high-smoothness, high-crystallinity, and dense CsBi3I10 perovskite films. Compared with traditionally spin-coated CsBi3I10 photodetectors (PDs), the metal-semiconductor-metal PDs made by SCG showed a higher photocurrent, a lower dark current, and a bigger on/off ratio. In addition, the photocurrent of our unencapsulated CsBi3I10 perovskite PDs was not attenuated under long-time illumination. In addition, when the device was stored in air for 30 d, its performance also showed no degradation, demonstrating ultra-high stability. Furthermore, the synthesis was free of antisolvents, such as chlorobenzene and toluene, which is beneficial for the environmentally friendly assembly of the devices. Our strategy opens up a new way to prepare high-quality lead-free perovskite, which may be useful for applications in light-emitting diodes and solar cells.



中文翻译:

高质量,高灵敏度和稳定性的,用于近红外光电探测器的高质量CsBi 3 I 10无铅钙钛矿膜的空间有限生长

作为无铅钙钛矿,CsBi 3 I 10由于其高的耐热性和长的电子扩散长度而备受关注。然而,固溶处理的高性能CsBi 3 I 10钙钛矿器件由于形成二维结构而受到阻碍,这导致了极高的表面粗糙度和许多针孔。在本文中,我们报道了一种使用单层聚苯乙烯(PS)球形模板的空间限制生长(SCG)方法,以获得高光滑度,高结晶度和致密CsBi 3 I 10钙钛矿薄膜。与传统的旋涂CsBi 3 I 10相比光电探测器(PDs),由SCG制造的金属-半导体-金属PDs显示出更高的光电流,更低的暗电流和更大的开/关比。此外,我们的未封装的CsBi 3 I 10钙钛矿PD的光电流在长时间照明下不会衰减。此外,当该设备在空气中存放30天时,其性能也没有降低,表明其具有超高的稳定性。此外,该合成不含抗溶剂,例如氯苯和甲苯,这对装置的环境友好组装是有益的。我们的策略为制备高质量的无铅钙钛矿开辟了一条新途径,这可能会用于发光二极管和太阳能电池。

更新日期:2020-10-12
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