ZnTe-CdZnTe quantum well structures for optical emission and detection

P. R. Vaya; R. Srinivasan

doi:10.1117/12.347934

28 April 1999 ZnTe-CdZnTe quantum well structures for optical emission and detection

P. R. Vaya, R. Srinivasan

Proceedings Volume 3666, International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '98; (1999) https://doi.org/10.1117/12.347934
Event: International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '98, 1998, New Delhi, India

Abstract

The strain introduced at the junction of two lattice mismatched semiconductors reshapes the valence band reducing the density of states, intervalence band absorption, Auger recombination and temperature sensitivity. In the present study, a strained ternary system Cd_xZn_1-xTe on ZnTe substrate has been investigated. The effect of x on critical thickness, effective mass, band gap, optical gain and current density has been calculated. This system was chosen as it is useful in blue emission, emission at high temperature etc. and also it can be grown on Silicon substrate directly. The optical gain increases with x whereas current density decreases. The laser cavity length and number of quantum wells have been optimized for different temperatures and for Cd compositions of 0.1 and 0.2 and well widths of 50 A and 60 A. Further, intersubband transitions in symmetric - (ZnTe-Cd_xZn_1-xTe-ZnTe) square quantum well have been studied. The effect of barrier height and well width on absorption coefficient and detectivity, which have a large bearing on the performance of a detector, have been studied. Absorption coefficient ((alpha) ) and detectivity (D_(lambda )) are calculated for different frequencies (w) for the given x and well width. The maximum value of (alpha) and D_(lambda ) are picked up from the (alpha) versus w, and D_(lambda ) versus w curves, and are plotted as the functions of Cd composition (x) and well width. Both (alpha) and D_(lambda ) increases with x and decreases with well width.

Citation Download Citation

P. R. Vaya and R. Srinivasan "ZnTe-CdZnTe quantum well structures for optical emission and detection", Proc. SPIE 3666, International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '98, (28 April 1999); https://doi.org/10.1117/12.347934

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