Ultrafast photoconductivity is studied for crystalline (bulk), polycrystalline (microstructure), and nanocomposite (nanostructure) ZnSe material systems. Spectral transmission analyses show a pronounced red-shift of the absorption edge for only the nanocomposite ZnSe (being comprised of 500 nm nanoparticles in a polymer host). Ultrafast transient analyses show respective 6 ns, 1.5 ns, and 95 ps charge-carrier lifetimes for the respective material systems. The results are interpreted with a diffusion-recombination model, showing distinct regimes for bulk diffusion and surface recombination. Nanocomposite ZnSe is shown to be particularly advantageous for terahertz applications seeking ultrafast photoconductivity with high dielectric breakdown strengths and ultrashort charge-carrier lifetimes.
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27 January 2014
Research Article|
January 27 2014
Ultrafast photoconductivity of crystalline, polycrystalline, and nanocomposite ZnSe material systems for terahertz applications
C. M. Collier;
C. M. Collier
Integrated Optics Laboratory, The University of British Columbia
, Kelowna, British Columbia
V1V 1V7, Canada
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J. F. Holzman
J. F. Holzman
Integrated Optics Laboratory, The University of British Columbia
, Kelowna, British Columbia
V1V 1V7, Canada
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Appl. Phys. Lett. 104, 042101 (2014)
Article history
Received:
September 26 2013
Accepted:
January 11 2014
Citation
C. M. Collier, J. F. Holzman; Ultrafast photoconductivity of crystalline, polycrystalline, and nanocomposite ZnSe material systems for terahertz applications. Appl. Phys. Lett. 27 January 2014; 104 (4): 042101. https://doi.org/10.1063/1.4863217
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