Development of ZnMgCdO-based alloys and heterostructures for optical applications

Michael Gerhold; Andrei Osinsky; David C. Look

doi:10.1117/12.643144

28 February 2006 Development of ZnMgCdO-based alloys and heterostructures for optical applications

Michael Gerhold, Andrei Osinsky, David C. Look

Proceedings Volume 6127, Quantum Sensing and Nanophotonic Devices III; 61271B (2006) https://doi.org/10.1117/12.643144
Event: Integrated Optoelectronic Devices 2006, 2006, San Jose, California, United States

Abstract

This paper reviews of some of the recent progress made in the development of high quality MgZnO and ZnCdO layers grown epitaxially by RF-plasma molecular beam epitaxy (MBE). We summarize optical and electrical properties of high quality Cd_xZn_1-xO alloys with Cd mole fraction from 0.02 to 0.78 and discuss phase separation phenomenon which may be present in ternary alloys. A single-crystal wurtzite structure of CdZnO alloys for this entire range of compositions was confirmed by X-ray diffraction. Compositional analysis was performed using SIMS and RBS. Strong optical emission in the 380 nm to 574 nm spectral range was achieved at RT from Cd_xZn_1-xO with various compositions, demonstrating a great potential for use in LEDs. Compositional fluctuations in a Cd_0.16Zn_0.84O films were not detected by spatially resolved CL measurements, although intensity fluctuation with features of ~0.5 μm diameter were seen on the intensity maps. Dependence of the fundamental optical band gap on the composition of Cd_xZn_1-xO alloys, band gap bowing, and the possible effect of composition micro-fluctuations in ternary Cd_xZn_1-xO alloys on the optical bandgap is also discussed. Time resolved photoluminescence shows multi-exponential decay with 21 psec. and 49±3 psec. lifetimes, suggesting that composition micro-fluctuations may be present in Cd_0.16Zn_0.84O film. High conductivity and optical transparency of the CdZnO films with high Cd-mole fraction is attractive for making high performance electrodes. We also report on crystallographic and optical properties of CdZnO/ZnO multiple quantum wells (MQW).

Citation Download Citation

Michael Gerhold, Andrei Osinsky, and David C. Look "Development of ZnMgCdO-based alloys and heterostructures for optical applications", Proc. SPIE 6127, Quantum Sensing and Nanophotonic Devices III, 61271B (28 February 2006); https://doi.org/10.1117/12.643144

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