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Updated: May 16, 2025
Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids
Published on: August 23, 2012
First principles study of structural and electronic properties of single and double-walled ZnSe nanotubes, toward the
Hao Zuo1, Yuqin Zhang1, Guijun Du1
1College of Physics, Chengdu University of Technology, No. 1 East Third Road, Erxianqiao, Chenghua District, 610059 Chengdu, Sichuan, China. zhangyuqin19@cdut.edu.cn.
Abstract:
This study employed density functional theory (DFT) to investigate single-walled (SWZSNTs) and double-walled ZnSe nanotubes (DWZSNTs) for photocatalytic hydrogen production. Calculations revealed that SWZSNTs' bandgap decreased with diameter while showing negligible chirality dependence. HSE06 hybrid functional calculations yielded optimal bandgaps of 2.29 and 2.24 eV for (4,0)@(12,0) and (5,0)@(12,0) DWZSNTs, respectively, matching photocatalytic water splitting requirements. The DWZSNTs demonstrated efficient charge separation via a type-II band structure between the inner and outer tubes, with exceptional carrier mobilities (508.55 cm2 V-1 s-1 for electrons and 46.27 cm2 V-1 s-1 for holes) surpassing SWZSNTs and rivaling monolayer ZnSe. The visible-light-absorption spectra further confirmed DWZSNTs' superior performance compared to the single-walled structures, suggesting their strong potential as photocatalysts for hydrogen generation.
