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Sub-monolayer quantum dots in confinement enhanced dots-in-a-well heterostructure

DSpace at IIT Bombay

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Title Sub-monolayer quantum dots in confinement enhanced dots-in-a-well heterostructure
 
Creator SENGUPTA, S
KIM, JO
BARVE, AV
ADHIKARY, S
SHARMA, YD
GAUTAM, N
LEE, SJ
NOH, SK
CHAKRABARTI, S
KRISHNA, S
 
Subject INFRARED PHOTODETECTORS
 
Description We have investigated optical properties and device performance of sub-monolayer quantum dots infrared photodetector with confinement enhancing (CE) barrier and compared with conventional Stranski-Krastanov quantum dots with a similar design. This quantum dots-in-a-well structure with CE barrier enables higher quantum confinement and increased absorption efficiency due to stronger overlap of wavefunctions between the ground state and the excited state. Normal incidence photoresponse peak is obtained at 7.5 mu m with a detectivity of 1.2 x 10(11) cm Hz(1/2) W-1 and responsivity of 0.5 A/W (77 K, 0.4 V, f/2 optics). Using photoluminescence and spectral response measurements, the bandstructure of the samples were deduced semi-empirically. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4711214]
 
Publisher AMER INST PHYSICS
 
Date 2014-10-15T08:43:33Z
2014-10-15T08:43:33Z
2012
 
Type Article
 
Identifier APPLIED PHYSICS LETTERS, 100(19)
http://dx.doi.org/10.1063/1.4711214
http://dspace.library.iitb.ac.in/jspui/handle/100/14713
 
Language en