Optical and local current studies on InAs/GaAs quantum dots

T. X. Li; P. P. Chen; F. Z. Wang; Z. H. Chen; X. S. Chen; W. Lu

doi:10.1117/12.668108

1 February 2006 Optical and local current studies on InAs/GaAs quantum dots

T. X. Li, P. P. Chen, F. Z. Wang, Z. H. Chen, X. S. Chen, W. Lu

Proceedings Volume 6034, ICO20: Optical Design and Fabrication; 60340O (2006) https://doi.org/10.1117/12.668108
Event: ICO20:Optical Devices and Instruments, 2005, Changchun, China

Abstract

By optimizing the growth technique of molecular beam epitaxy (MBE), we've prepared high quality InAs quantum dot samples, with high density (up to 1.2 x 10¹¹ cm^-2) and highly homogeneous size. Strong room temperature photoluminescence (PL) have been observed. The PL study reveals four confined-states QD transitions, which shows filling effect of the excited states. Dependence of these recombinations on excitation intensity and temperature has also been investigated. Conductive atomic force microscopy (C-AFM) has been used to probe the local current of InAs surface quantum dots (SQDs) on doped GaAs layer. It is found that current about picoampere can be drawn from individual QD while bias of a few hundred mV is applied between tip and the sample. Further I-V studies discover that surface quantum dots usually has a threshold bias near 200 mV for current transmission, whereas bias of 400 mV is needed when the conductive tip is located on wetting layer.

Citation Download Citation

T. X. Li, P. P. Chen, F. Z. Wang, Z. H. Chen, X. S. Chen, and W. Lu "Optical and local current studies on InAs/GaAs quantum dots", Proc. SPIE 6034, ICO20: Optical Design and Fabrication, 60340O (1 February 2006); https://doi.org/10.1117/12.668108

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available