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Selective Doping of Quantum Dot Nanomaterials for Managing Intersubband Absorption, Dark Current, and Photoelectron Lifetime

Published online by Cambridge University Press:  07 February 2017

Kimberly Sablon ,
Andrei Sergeev ,
Xiang Zhang ,
Vladimir Mitin ,
Michael Yakimov ,
Vadim Tokranov  and
Serge Oktyabrsky
Kimberly Sablon
Affiliation:
U.S. Army Research Laboratory, Adelphi, Maryland 20783, USA
Andrei Sergeev*
Affiliation:
U.S. Army Research Laboratory, Adelphi, Maryland 20783, USA
Xiang Zhang
Affiliation:
State University of New York (SUNY) at Buffalo, Buffalo, NY 14260, USA
Vladimir Mitin
Affiliation:
State University of New York (SUNY) at Buffalo, Buffalo, NY 14260, USA
Michael Yakimov
Affiliation:
SUNY Polytechnic Institute, Albany, NY 12203, USA
Vadim Tokranov
Affiliation:
SUNY Polytechnic Institute, Albany, NY 12203, USA
Serge Oktyabrsky
Affiliation:
SUNY Polytechnic Institute, Albany, NY 12203, USA
*
*(Email: asergeev@buffalo.edu)

Abstract

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Novel approach to optimize quantum dot (QD) materials for specific optoelectronic applications is based on engineering of nanoscale potential profile, which is created by charged QDs. The nanoscale barriers prevent capture of photocarriers and drastically increase the photoelectron lifetime, which in turn strongly improves the photoconductive gain, responsivity, and sensitivity of photodetectors and decreases the nonradiative recombination losses of photovoltaic devices. QD charging may be created by various types of selective doping. To investigate effects of selective doping, we model, fabricated, and characterized AlGaAs/InAs QD structures with n-doping of QD layers, doping of interdot layers, and bipolar doping, which combines p-doping of QD layers with strong n-doping of the interdot space. We have measured spectral characteristics of photoresponse, photocurrent and dark current. The experimental data show that providing the same electron population of QDs, the bipolar doping creates the most contrasting nanoscale profile with the highest barriers around dots.

Keywords

nanostructurephotovoltaicphotoconductivity
Type
Articles
Information
MRS Advances , Volume 2 , Issue 14: Nanomaterials , 2017 , pp. 759 - 766
Copyright
Copyright © Materials Research Society 2017 

References

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