Atomically flat semiconductor nanoplatelets for light-emitting applications

Bai, Bing; Zhang, Chengxi; Dou, Yongjiang; Kong, Lingmei; Wang, Sheng; Wang, Lin; Li, Jun; Zhou, Yi; Liu, Long; Liu, Baiquan; Zhang, Xiaoyu; Hadar, Ido; Bekenstein, Yehonadav; Wang, Aixiang; Yin, Zongyou; Turyanska, Lyudmila; Feldmann, Jochen; Yang, Xuyong; Jia, Guohua

Abstract

The last decade has witnessed extensive breakthroughs and significant progress in atomically flat two-dimensional (2D) semiconductor nanoplatelets (NPLs) in terms of synthesis, growth mechanisms, optical and electronic properties and practical applications. Such NPLs have electronic structures similar to those of quantum wells in which excitons are predominantly confined along the vertical direction, while electrons are free to move in the lateral directions, resulting in unique optical properties, such as extremely narrow emission line width, short photoluminescence (PL) lifetime, high gain coefficient, and giant oscillator strength transition (GOST). These unique optical properties make NPLs favorable for high color purity light-emitting applications, in particular in light-emitting diodes (LEDs), backlights for liquid crystal displays (LCDs) and lasers. This review article first introduces the intrinsic characteristics of 2D semiconductor NPLs with atomic flatness. Subsequently, the approaches and mechanisms for the controlled synthesis of atomically flat NPLs are summarized followed by an insight on recent progress in the mediation of core/shell, core/crown and core/crown@shell structures by selective epitaxial growth of passivation layers on different planes of NPLs. Moreover, an overview of the unique optical properties and the associated light-emitting applications is elaborated. Despite great progress in this research field, there are some issues relating to heavy metal elements such as Cd2+ in NPLs, and the ambiguous gain mechanisms of NPLs and others are the main obstacles that prevent NPLs from widespread applications. Therefore, a perspective is included at the end of this review article, in which the current challenges in this stimulating research field are discussed and possible solutions to tackle these challenges are proposed.

Citation

Bai, B., Zhang, C., Dou, Y., Kong, L., Wang, L., Wang, S., Li, J., Zhou, Y., Liu, L., Liu, B., Zhang, X., Hadar, I., Bekenstein, Y., Wang, A., Yin, Z., Turyanska, L., Feldmann, J., Yang, X., & Jia, G. (2023). Atomically flat semiconductor nanoplatelets for light-emitting applications. Chemical Society Reviews, 52(1), 318-360. https://doi.org/10.1039/d2cs00130f

• Journal Article Type: Article
• Acceptance Date: Dec 19, 2022
• Online Publication Date: Dec 19, 2022
• Publication Date: Jan 7, 2023
• Deposit Date: Mar 30, 2023
• Journal: Chemical Society Reviews
• Print ISSN: 0306-0012
• Electronic ISSN: 1460-4744
• Publisher: Royal Society of Chemistry
• Peer Reviewed: Peer Reviewed
• Volume: 52
• Issue: 1
• Pages: 318-360
• DOI: https://doi.org/10.1039/d2cs00130f
• Keywords: General Chemistry
• Public URL: https://nottingham-repository.worktribe.com/output/15924287
• Publisher URL: https://pubs.rsc.org/en/content/articlelanding/2023/CS/D2CS00130F