Infrared photoconductivity of InGaAs/GaAs heterostructures with quantum dots

Vladimir Shashkin; Vyacheslav Daniltsev; Mikhail Drozdov; Yuriy Drozdov; Vyacheslav Zakamov; Andrey Lukyanov; Lyubov Moldavskaya; Arkadiy Murel'

doi:10.1117/12.742377

2 May 2007 Infrared photoconductivity of InGaAs/GaAs heterostructures with quantum dots

Vladimir Shashkin, Vyacheslav Daniltsev, Mikhail Drozdov, Yuriy Drozdov, Vyacheslav Zakamov, Andrey Lukyanov, Lyubov Moldavskaya, Arkadiy Murel'

Author Affiliations +

Proceedings Volume 6636, 19th International Conference on Photoelectronics and Night Vision Devices; 66360L (2007) https://doi.org/10.1117/12.742377
Event: 19th International Conference on Photoelectronics and Night Vision Devices, 2006, Moscow, Russian Federation

Abstract

A new variant of fabricating of heterostructures with InAs quantum dots for infrared photodetectors by metalorganic chemical vapor deposition is discussed. A distinctive feature of the growth process is alternation of low and high temperature during growth of GaAs barrier layers. Sandwich structures with high density of quantum dots with high "aspect ratio" value have been grown by use of increased time of quantum dots growth. In these structures photoconductivity near to 4.5 μm is observed up to 200K. Responsitivity is O.5A/W at a temperature of 90K, detectivity is 3*10⁹ cmHz^1/2W^-1. Peculiarities of lateral infrared photoconductivity and electron transport in heterostructures with quantum dots and the two-dimensional electron channel connected with change in the mobility of 2D electrons caused by photoionization of quantum dots are shown. The first observation of the lateral intraband infrared photoconductivity in non-doped structures at additional photoexcitation as well as lateral interband photoconductivity in the range 1-2.7 μm at room temperature is reported.

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Vladimir Shashkin, Vyacheslav Daniltsev, Mikhail Drozdov, Yuriy Drozdov, Vyacheslav Zakamov, Andrey Lukyanov, Lyubov Moldavskaya, and Arkadiy Murel' "Infrared photoconductivity of InGaAs/GaAs heterostructures with quantum dots", Proc. SPIE 6636, 19th International Conference on Photoelectronics and Night Vision Devices, 66360L (2 May 2007); https://doi.org/10.1117/12.742377

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