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Determining Locations of Conduction Bands and Valence Bands of Semiconductor Nanoparticles Based on Their Band Gaps

[Image: see text] Experimentally, the values of band gaps of semiconductor nanoparticles are generally obtained by the absorption spectrum. Nevertheless, the determinations of the corresponding energy levels of the conduction bands (CBs) or valence bands (VBs) remain a challenge. Correspondingly, an...

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Detalles Bibliográficos
Autores principales: Shao, Qi, Lin, Haiping, Shao, Mingwang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2020
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7226884/
https://www.ncbi.nlm.nih.gov/pubmed/32426586
http://dx.doi.org/10.1021/acsomega.9b04238
Descripción
Sumario:[Image: see text] Experimentally, the values of band gaps of semiconductor nanoparticles are generally obtained by the absorption spectrum. Nevertheless, the determinations of the corresponding energy levels of the conduction bands (CBs) or valence bands (VBs) remain a challenge. Correspondingly, an accurate prediction of the CB or VB energy values is highly desired for designing and developing semiconductor devices. Herein, on the basis of the tight-binding approximation, we report a new linear equation that may quantitatively determine the energy levels of CB and VB of semiconductor nanoparticles based on their band gaps: [Image: see text] and [Image: see text], where p and q are constants related with the crystal structures, and m(e) and m(h) are the effective mass of electrons and holes, respectively. For single elements and binary crystals with tetrahedral and octahedral unit cells, which represent the majority of important semiconductors, the above equations can be simplified as: [Image: see text] and [Image: see text]. For Si nanoparticles, E(CB,Si) = 0.35 × (E(g) – 1.1) – 4.0 and E(VB,Si) = −0.65 × (E(g) – 1.1) – 5.1.