稳定高效混合卤素钙钛矿基发光二极管的制备

量子电子学报 ›› 2019, Vol. 36 ›› Issue (6): 705-708.

稳定高效混合卤素钙钛矿基发光二极管的制备

范炜盛1，2，李新化1

1中国科学院固体物理研究所材料物理重点实验室，安徽合肥 230031；
2中国科学技术大学，安徽合肥 230026

收稿日期:2019-03-28 修回日期:2019-04-10 出版日期:2019-11-28 发布日期:2019-11-19
通讯作者: 李新化 E-mail:xinhuali@issp.ac.cn
作者简介:范炜盛（1992-），安徽合肥人，研究生，主要从事新型半导体材料与器件方面的研究。E-mail：fwsheng@mail.ustc.edu.cn
基金资助:
Supported by National Natural Science Foundation of China (国家自然科学基金，51472247, 51671182), Joint Funds of National Natural Science Foundation of China (国家自然科学基金联合基金，U1632123)

Preparation of stable and efficient mixed-halide perovskite based light emitting diodes

FAN Weisheng1,2, LI Xinhua1

1 Key Laboratory of Material Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China;
2 University of Science and Technology of China, Hefei 230026, China

Received:2019-03-28 Revised:2019-04-10 Published:2019-11-28 Online:2019-11-19

摘要/Abstract

摘要： 以通过调节卤化物的化学计量比来调节带隙是有机-无机杂化钙钛矿的一个显著优点，这在串联太阳能电池、发射波长可调的发光二极管(LED)及激光等方面起了至关重要的作用。但是，光照或施加偏压会引起混合卤素钙钛矿相分离，导致富碘区域的形成、光伏器件开路电压降低和发光LED的发射波长被钉扎在红外区域。通过将一种具有自组装作用的有机胺长链覆盖在混合卤化物钙钛矿纳米晶的表面，抑制相分离，得到了稳定发射波长LED，并且其外部量子效率提高至2%。

关键词: 发光二极管；混合卤素钙钛矿；卤素离子移动；相分离

Abstract: It is a remarkable advantage of organic−inorganic hybrid perovskite to tune their bandgap by adjusting the stoichiometric ratio of halide. It is critical to their applications in tandem solar cells, wavelength-tunable light emitting diodes (LEDs) and laser. However, illumination or applied bias will cause the phase separation of mixed-halide perovskite, and results in formation of iodide-rich domains, reduction of photovoltaic devices open-circuit voltage. The emission wavelength of luminous LED is pinned to the infrared region. The phase separation is suppressed by halide redistribution by self-assembled long-chain organic ammonium capping layers at nanometer-sized grain surfaces. The LED with stable emission wavelength is obtained, and its external quantum efficiency is improved to 2%.

Key words: light emitting diodes, mixed-halide perovskite, halide migration, phase separation

中图分类号:

TM923.34

范炜盛, 李新化. 稳定高效混合卤素钙钛矿基发光二极管的制备[J]. 量子电子学报, 2019, 36(6): 705-708.

FAN Weisheng, LI Xinhua. Preparation of stable and efficient mixed-halide perovskite based light emitting diodes[J]. Chinese Journal of Quantum Electronics, 2019, 36(6): 705-708.

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