TITLE

Intermediate-band material based on GaAs quantum rings for solar cells

AUTHOR(S)
Jiang Wu; Dali Shao; Zhenhua Li; Manasreh, M. O.; Kunets, Vasyl P.; Wang, Zhiming M.; Salamo, G. J.
PUB. DATE
August 2009
SOURCE
Applied Physics Letters;8/17/2009, Vol. 95 Issue 7, p071908
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The intermediate-band concept is invoked to explain the photoresponse spectra obtained for unbiased devices fabricated from GaAs quantum rings grown by a droplet epitaxy technique on lattice-matched Al0.3Ga0.7As barriers. The photoresponse spectra where measured at room temperature in the visible-near-infrared spectral range. The presence of the intermediate band in the device active region is confirmed by measuring the mid-infrared photoresponse, which is attributed to the intersubband transitions in the conduction band. The photocurrent was measured at room temperature and found to be about four orders of magnitude larger than the dark current in the voltage range of ± 4.0 V.
ACCESSION #
43887408

 

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