期刊
PHYSICAL REVIEW B
卷 80, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.195308
关键词
annealing; cadmium compounds; colloids; excitons; II-VI semiconductors; nanostructured materials; photoconductivity; photoluminescence; radiation quenching; semiconductor thin films; wide band gap semiconductors
资金
- G.I.F
- Israel Science Foundation-Center of Excellence
- Harry de Jur Chair in Applied Science
- Alfred and Erica Larisch Memorial Chair in Solar Energy
The voltage dependence of the phototransport in colloidal CdSe nanorods (NRs) arrays was studied for different capping molecules and degree of NR alignment. The photocurrent was found to considerably enhance by exchanging the trioctylphosphine capping ligands by diamine molecules or upon annealing. The corresponding current-voltage characteristics were highly nonlinear, showing, in the aligned NR arrays, a notable decrease in the differential conductivity at a certain capping-molecule-dependent applied electrical field. This transition smears, however, when the degree of NR alignment is reduced. These findings are well described by an exciton field-ionization model, which also accounts for the correlation we observe between the photocurrent I(V) curves and the voltage dependence of the fluorescence quenching in seeded-grown CdSe/CdS core/shell NR films.
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