氧气对CsPbBr3单晶电学性能的影响

人工晶体学报 ›› 2021, Vol. 50 ›› Issue (10): 1913-1918.

氧气对CsPbBr₃单晶电学性能的影响

宫政¹, 汪西¹, 王卿¹, 陆枳岑¹, 潘尚可^1,2, 潘建国^1,2

1.宁波大学材料科学与化学工程学院,宁波市新型功能材料及其制备科学国家重点实验室培育基地,宁波 315211;
2.浙江省光电探测材料及器件重点实验室,宁波 315211

收稿日期:2021-09-01 出版日期:2021-10-15 发布日期:2021-11-24
通讯作者: 潘尚可,博士,教授。E-mail:panshangke@nbu.edu.cn
作者简介:宫政(1997—),男,黑龙江省人,硕士研究生。E-mail:378234155@qq.com。潘尚可(1976—),宁波大学教授,博士生导师。主要从事新型闪烁晶体(重点是中子探测闪烁体)的结构、生长、性能、器件及产业化研究;新型钙钛矿半导体单晶生长及薄膜制备与器件应用研究。
基金资助:
国家自然科学基金(61875096,61775108)

Effect of Oxygen on Electrical Performance of CsPbBr₃ Single Crystal

GONG Zheng¹, WANG Xi¹, WANG Qin¹, LU Zhicen¹, PAN Shangke^1,2, PAN Jianguo^1,2

1. State Key Laboratory Base of Novel Function Materials and Preparation Science, School of Material Sciences and Chemical Engineering, Ningbo University, Ningbo 315211, China;
2. Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province, Ningbo 315211, China

Received:2021-09-01 Online:2021-10-15 Published:2021-11-24

摘要/Abstract

摘要： CsPbBr₃兼具高探测效率和较好的稳定性,是当前高性能高能辐射探测器的热门材料。在使用坩埚下降法制备CsPbBr₃单晶的配料阶段,如果无法有效隔绝原料与氧气的接触,氧气会吸附于原料表面难以排出,在原料熔化后会聚集在密封坩埚的上方,导致所得到的单晶颜色沿生长方向逐渐变深,这一颜色变化不会改变CsPbBr₃的禁带宽度。通过对单晶上端切片进行电学性能测试发现,从单晶的中心到外侧,CsPbBr₃单晶的电阻率逐渐下降,陷阱密度和载流子迁移率逐渐增大,但对X射线的响应度基本不变。本文为研究高质量CsPbBr₃单晶的生长提供帮助。

关键词: CsPbBr₃, 坩埚下降法, X射线探测, 钙钛矿, 电学特性, 氧气, 单晶颜色

Abstract: CsPbBr₃ is a promising material for high-performance high-energy radiation detectors with high detection efficiency and good stability. In the ingredient stage of preparing the CsPbBr₃ single crystal by the vertical Bridgman technique, the oxygen will adsorb on the surface of raw materials, and gather above the sealed crucible after melting, if the contact between the raw material and the oxygen cannot be effectively isolated, and results in a gradually darker color of the single crystal along the growth direction. The color change does not change the band gap of the CsPbBr₃. The electrical performance test of the upper end section of CsPbBr₃ single crystals reveals that the resistivity gradually decreases, and the trap density and carrier mobility gradually increases from the center to the outside of CsPbBr₃ single crystals. But the responsiveness to X-rays is unchanged from the center to the outside of CsPbBr₃ single crystals. This paper contributes to studies on the growth of high-quality CsPbBr₃ single crystals.

Key words: CsPbBr₃, vertical Bridgman technique, X-ray detection, perovskite, electrical property, oxygen, single crystal color

中图分类号:

O738

宫政, 汪西, 王卿, 陆枳岑, 潘尚可, 潘建国. 氧气对CsPbBr₃单晶电学性能的影响[J]. 人工晶体学报, 2021, 50(10): 1913-1918.

GONG Zheng, WANG Xi, WANG Qin, LU Zhicen, PAN Shangke, PAN Jianguo. Effect of Oxygen on Electrical Performance of CsPbBr₃ Single Crystal[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2021, 50(10): 1913-1918.

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氧气对CsPbBr₃单晶电学性能的影响

Effect of Oxygen on Electrical Performance of CsPbBr₃ Single Crystal

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