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Evidence of suppressed hot carrier relaxation in type-II InAs/AlAs1-xSbx quantum wells
Author(s): V. R. Whiteside; H. Esmaielpour; J. Tang; S. Vijeyaragunathan; T. D. Mishima; M. B. Santos; B. Wang; R. Q. Yang; I. R. Sellers
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Paper Abstract

Hot carrier solar cells (HCSCs) have been proposed as devices, which can increase the conversion efficiency of a single junction solar cell above the Shockley-Queisser limit. For practical implementation of such systems, solar cells operating with efficient hot carrier extraction must circumvent two fundamental challenges: 1. Find an absorber material in which hot carriers are sustained either via inhibiting or circumventing phonon relaxation pathways; 2. Implement energy selective contacts in which only a narrow range of energy within the hot carrier distribution is extracted; thereby, reducing cooling losses in the contacts.

Here, type-II InAs/AlAs0.16Sb0.84 quantum-wells are investigated as a candidate system for hot carrier absorbers. Continuous wave power and temperature dependent photoluminescence measurements are presented that indicate: a transition in the dominant hot carrier relaxation process from conventional phonon-mediated carrier relaxation − below 90 K − to a regime where inhibited radiative recombination dominates the hot carrier relaxation − at higher temperatures1. The reduction in the PL efficiency is strongly coupled to an increase in the hot carrier temperature extracted from the measurements. This behavior is attributed to a build-up of electrons in the QWs, which appears to inhibit electron-phonon relaxation2.

Paper Details

Date Published: 23 September 2016
PDF: 5 pages
Proc. SPIE 9937, Next Generation Technologies for Solar Energy Conversion VII, 993709 (23 September 2016); doi: 10.1117/12.2237167
Show Author Affiliations
V. R. Whiteside, The Univ. of Oklahoma (United States)
H. Esmaielpour, The Univ. of Oklahoma (United States)
J. Tang, The Univ. of Oklahoma (United States)
S. Vijeyaragunathan, The Univ. of Oklahoma (United States)
T. D. Mishima, The Univ. of Oklahoma (United States)
M. B. Santos, The Univ. of Oklahoma (United States)
B. Wang, The Univ. of Oklahoma (United States)
R. Q. Yang, The Univ. of Oklahoma (United States)
I. R. Sellers, The Univ. of Oklahoma (United States)


Published in SPIE Proceedings Vol. 9937:
Next Generation Technologies for Solar Energy Conversion VII
Oleg V. Sulima; Gavin Conibeer, Editor(s)

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