Surface depletion induced quantum confinement in CdS nanobelts

ACS Nano
Dehui LiQihua Xiong

Abstract

We investigate the surface depletion induced quantum confinement in CdS nanobelts beyond the quantum confinement regime, where the thickness is much larger than the bulk exciton Bohr radius. From room temperature to 77 K, the emission energy of free exciton A scales linearly versus 1/L(2) when the thickness L is less than 100 nm, while a deviation occurs for those belts thicker than 100 nm due to the reabsorption effect. The 1/L(2) dependence can be explained by the surface depletion induced quantum confinement, which modifies the confinement potential leading to a quasi-square potential well smaller than the geometric thickness of nanobelts, giving rise to the confinement effect to exciton emission beyond the quantum confinement regime. The surface depletion is sensitive to carrier concentration and surface states. As the temperature decreases, the decrease of the electrostatic potential drop in the surface depletion region leads to a weaker confinement due to the decrease of carrier concentration. With a layer of polymethyl methacrylate (PMMA) passivation, PL spectra exhibit pronounced red shifts due to the decrease of the surface states at room temperature. No shift is found at 10 K both with or without PMMA passivation, sug...Continue Reading

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Citations

Apr 23, 2013·The European Physical Journal. E, Soft Matter·Yun GaoGi Xue
Jul 18, 2014·Nano Letters·Dehui LiQihua Xiong
Jun 17, 2015·Scientific Reports·Wei LiYufeng Guo
Mar 19, 2014·Advanced Materials·Kaimo Deng, Liang Li
Sep 4, 2015·ACS Applied Materials & Interfaces·Linghui ZhuShengping Ruan
Aug 6, 2015·Journal of the American Chemical Society·Guanjun XiaoBo Zou
Aug 14, 2013·Optics Express·Dehui LiQihua Xiong
Jun 27, 2019·Nanoscale Research Letters·Xian GaoRui Chen

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