Photocurrent spectroscopy of single CdS nanosheets: Valence band structure and two photon absorption

2011 ◽  
Vol 98 (14) ◽  
pp. 143102 ◽  
Author(s):  
P. Kumar ◽  
A. Wade ◽  
L. M. Smith ◽  
H. E. Jackson ◽  
J. M. Yarrison-Rice ◽  
...  
Keyword(s):  
Band Structure ◽  
Valence Band ◽  
Photon Absorption ◽  
Valence Band Structure ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Photocurrent Spectroscopy

Optimization of Band Structure and Quantum-Size-Effect Tuning for Two-Photon Absorption Enhancement in Quantum Dots

Nano Letters ◽  
2011 ◽  
Vol 11 (3) ◽  
pp. 1227-1231 ◽  
Author(s):  
Lazaro A. Padilha ◽  
Gero Nootz ◽  
Peter D. Olszak ◽  
Scott Webster ◽  
David J. Hagan ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Band Structure ◽  
Size Effect ◽  
Quantum Size Effect ◽  
Photon Absorption ◽  
Absorption Enhancement ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Quantum Size

Nonlinear Two-Photon Photocurrent Spectroscopy of CdS Nanosheets

2012 ◽  
Vol 1439 ◽  
pp. 77-81
Author(s):  
Parveen Kumar ◽  
Aaron Wade ◽  
Leigh Morris Smith ◽  
Howard E Jackson ◽  
Jan M Yarrison-Rice ◽  
...  
Keyword(s):  
Band Gap ◽  
Energy Gap ◽  
Nonlinear Coefficient ◽  
Schottky Contacts ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Photocurrent Spectroscopy ◽  
Metal Semiconductor Metal ◽  
Cds Nanostructures

AbstractWe study the photocurrent from photoexcited charged carriers excited with lasers of energy both above and below the energy gap in CdS nanostructures. We observe non-linear photocurrents in CdS nanosheet devices in the metal-semiconductor-metal configuration with Schottky contacts for sub-band gap excitations. Analysis of two-photon absorption dominated photocurrents reveals a nonlinear coefficient of β = 2 cm/GW for these nanosheet devices, which is comparable to those of bulk CdS. We demonstrate the use of the photocurrent polarization measurements to determine the orientation of atoms in the nanosheet.

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