Enhanced Luminescent Performance via Passivation of Surface Undercoordinated Pb Atoms in a CsPbBr3 Microplate. Issue 7 (3rd February 2023)

• Record Type: Journal Article
• Authors: Zhu, Yizhi; Shi, Linlin; Guo, Heng; Chen, Jinping; Lu, Junfeng; Wang, Weian; Xu, Zhangsheng; Gao, Naiwei; Han, Xun; Peng, Zhengchun; Cui, Qiannan; Xu, Chunxiang; Pan, Caofeng
• Is Part Of: Advanced optical materials. Volume 11:Issue 7(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2023-02-03
• Subjects: defects passivation -- luminescent performance -- perovskite microplates -- photodegraded reaction -- undercoordinated Pb atoms; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.202202428
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: Perovskite materials are widely used in the fields of luminescence and light energy conversion with the advantages of low cost and outstanding optoelectronic properties. However, abundant surface lattice defects heavily affect the performances of perovskite optoelectronic devices. Here, by treating surface defects with oleylamine molecules in situ, the surface trap states are significantly decreased in a CsPbBr3 microplate, enabling photoluminescence intensity and carrier lifetimes to be dramatically enhanced and prolonged, respectively. These interesting phenomena can be attributed to the binding of undercoordinated Pb atoms with N atoms on the surface of perovskite microplate. The strong binding energy of lead‐halogen bonds inhibits the photodegraded reactions of the crystal, leading to the significant improvement of luminescent stability for the microplate correspondingly. The results not only provide experimental guidance for passivating lattice defects but also pave the way for improving the efficiency of wide materials and optoelectronic devices. Abstract : Abundant surface trap states are one of the crucial factors that hinder the performances of perovskites‐based optoelectronic devices. By passivating surface uncoordinated Pb 2+ bonds with oleylamine molecules in situ, the luminescent performance of perovskite crystal is improved remarkably as well as its structural photodegraded reactions are inhibited significantly.