Xie, C., Pusino, V. , Khalid, A. , Craig, A. P., Marshall, A. and Cumming, D. R.S. (2018) Monolithically integrated InAsSb-based nBnBn heterostructure on GaAs for infrared detection. IEEE Journal of Selected Topics in Quantum Electronics, 24(6), 7800106. (doi: 10.1109/JSTQE.2018.2828101)
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Abstract
High operating temperature i nfrared photo detectors with multi -color function that are capable of monolithic integration are of increasing importance in developing the next generation of mid -IR imag e sensors. Applications of these sensors include defense, medical diagnosis, environmental and astronomical observations. We have investigated a novel InAsSb -based nBnBn heterostructure that combines a state -of-art InAsSb nBn detector with an InAsSb/GaSb heterojuncti on detector . At room temperature, r educti on in the dark current density of more than an order of magnitude was achieved compared to previously investigated InAsSb/GaSb heterojunction dete ctors . Electrical characterization from cryogenic temperatures to roo m temperature confirmed that the nBnBn device was diffusion limited for temperature s above 150K. O ptical measurements demonstrated that the nBnBn detector was sensitive in both the SWIR and MWIR wavelength range at room temperature . The specific detectivity (D*) of the competed nBnBn devices was calculated to be 8.6 × 10 8 cm · Hz 1/2 W -1 at 300K and approximately 1.0 × 10 10 cm · Hz 1/2 W -1 when cooled down to 200K (with 0.3V reverse bias and 1550nm illumination ). In addition, all photodetector layers were grown monolithically on GaAs active layers u sing the interfacial misfit array growth mode . Our results therefore pave the way for the development of new active pixel designs for monolithically integrated mid -IR imaging arrays.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Xie, Mr Chengzhi and Cumming, Professor David and Pusino, Dr Vincenzo and Khalid, Dr Ata-Ul-Habib |
| Authors: | Xie, C., Pusino, V., Khalid, A., Craig, A. P., Marshall, A., and Cumming, D. R.S. |
| College/School: | College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering |
| Journal Name: | IEEE Journal of Selected Topics in Quantum Electronics |
| Publisher: | IEEE |
| ISSN: | 1077-260X |
| ISSN (Online): | 1558-4542 |
| Published Online: | 24 April 2018 |
| Copyright Holders: | Copyright © 2018 IEEE |
| First Published: | First published in IEEE Journal of Selected Topics in Quantum Electronics 24(6):7800106 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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