Nonlayered CdSe Flakes Homojunctions. (22nd January 2020)

• Record Type: Journal Article
• Authors: Jin, Bao; Liang, Fei; Hu, Zhi‐Yi; Wei, Ping; Liu, Kailang; Hu, Xiaozong; Van Tendeloo, Gustaaf; Lin, Zheshuai; Li, Huiqiao; Zhou, Xing; Xiong, Qihua; Zhai, Tianyou
• Is Part Of: Advanced functional materials. Volume 30:Number 11(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-01-22
• Subjects: CdSe flakes -- nonlayered materials -- wurtzite‐zinc blend homojunction; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201908902
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: 2D homojunctions have stimulated extensive attention because of their perfect thermal and lattice matches, as well as their tunable band structures in 2D morphology, which provide fascinating opportunities for novel electronics and optoelectronics. Recently, 2D nonlayered materials have attracted the attention of researchers owing to their superior functional applications and diverse portfolio of the 2D family. Therefore, 2D nonlayered homojunctions would open the door to a rich spectrum of exotic 2D materials. However, they are not investigated due to their extremely difficult synthesis methods. Herein, nonlayered CdSe flakes homojunctions are obtained via self‐limited growth with InCl3 as a passivation agent. Interestingly, two pieces of vertical wurtzite‐zinc blende (WZ‐ZB) homojunctions epitaxially integrate into WZ/ZB lateral junctions. These homojunctions show a divergent second‐harmonic generation intensity, strongly correlated to the multiple twinned ZB phase, as identified by aberration‐corrected scanning transmission electron microscopy and theoretical calculations. Impressively, the photodetector based on this WZ/ZB CdSe homojunction shows excellent performances, integrating a high photoswitching ratio (3.4 × 10 5 ) and photoresponsivity (3.7 × 10 3 A W −1 ), suggesting promising potential for applications in electronics and optoelectronics. Abstract : Nonlayered CdSe homojunction flakes are obtained via self‐limited growth with InCl3 as the passivation agent. The two pieces of homojunctions epitaxially integrated together display a giant divergence of second‐harmonic generation intensity, which is attributed to the twinned zinc blende structure in the homojunctions. It is further confirmed by scanning transmission electron microscopy and theoretical calculations.