TY - JOUR
T1 - Spin-cast deposition of CdSe-CdS core-shell colloidal quantum dots on doped GaAs substrates
T2 - Structural and optical characterization
AU - Stiff-Roberts, Adrienne D.
AU - Zhang, Wanming
AU - Xu, Jian
AU - Peng, Hongying
AU - Everitt, Henry O.
N1 - Funding Information:
Manuscript received April 3, 2006; revised March 6, 2007. This work was supported in part by the National Science Foundation under Grant 0547273. The review of this paper was arranged by Associate Editor A. Bose.
PY - 2007/7
Y1 - 2007/7
N2 - The detailed study of the effects of spin recipe and GaAs substrate doping (i.e., semi-insulating, ç-type, or p-type) on the structural and optical properties of spin-cast CdSe-CdS core-shell CQDs provides insight into the surface adsorption and charge transfer mechanisms that will influence any potential optoelectronic device. The hypotheses of this study are: i) it is possible to establish spin-casting recipes that yield a thin film of CQDs with large surface density and uniform size, and ii) it is possible to control the optical response of CQDs by varying the GaAs substrate doping to influence charge transfer processes. As a result of these measurements, we have been able to demonstrate a strong dependence of spin-cast CQD structural properties on the doping type of the GaAs substrate, as well as evidence from measured optical properties to support the idea that hot carriers photoexcited in the GaAs substrate are transferred either to the CQD surface states through organic surface ligands or directly to confined states within the CQD.
AB - The detailed study of the effects of spin recipe and GaAs substrate doping (i.e., semi-insulating, ç-type, or p-type) on the structural and optical properties of spin-cast CdSe-CdS core-shell CQDs provides insight into the surface adsorption and charge transfer mechanisms that will influence any potential optoelectronic device. The hypotheses of this study are: i) it is possible to establish spin-casting recipes that yield a thin film of CQDs with large surface density and uniform size, and ii) it is possible to control the optical response of CQDs by varying the GaAs substrate doping to influence charge transfer processes. As a result of these measurements, we have been able to demonstrate a strong dependence of spin-cast CQD structural properties on the doping type of the GaAs substrate, as well as evidence from measured optical properties to support the idea that hot carriers photoexcited in the GaAs substrate are transferred either to the CQD surface states through organic surface ligands or directly to confined states within the CQD.
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U2 - 10.1109/TNANO.2007.896845
DO - 10.1109/TNANO.2007.896845
M3 - Article
AN - SCOPUS:34547295864
SN - 1536-125X
VL - 6
SP - 413
EP - 419
JO - IEEE Transactions on Nanotechnology
JF - IEEE Transactions on Nanotechnology
IS - 4
ER -