Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 11, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201908902
Keywords
CdSe flakes; nonlayered materials; wurtzite-zinc blend homojunction
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Funding
- National Natural Science Foundation of China [21825103, 51727809, 51802103]
- Hubei Provincial Natural Science Foundation of China [2019CFA002]
- Fundamental Research Funds for the Central Universities [HUST: 2019kfyXMBZ018, WUT: 2019III012GX]
- Analytical and Testing Center in HUST
- State Key Laboratory of Silicate Materials for Architectures in WUT
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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 x 10(5)) and photoresponsivity (3.7 x 10(3) A W-1), suggesting promising potential for applications in electronics and optoelectronics.
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