Carrier dynamics in epilayers and nanocolumns of ternary AlGaN with a tunable bandgap

6533b859fe1ef96bd12b7fce

RESEARCH PRODUCT

Carrier dynamics in epilayers and nanocolumns of ternary AlGaN with a tunable bandgap

Kuei-hsien Chen Kęstutis Jarašiūnas Saulius Miasojedovas B. Berzina Yen-ting Chen Li-chyong Chen Saulius Nargelas Patrik ŠčAjev Ramūnas Aleksiejūnas J Grigorjeva Laima Trinkler M W Chen

subject

Materials science Silicon business.industry Band gap chemistry.chemical_element Carrier lifetime Epitaxy chemistry Sapphire Optoelectronics Ternary operation Carrier dynamics business Excitation

description

We apply several optical time-resolved techniques to investigate the dynamics of excess carriers in AlxGa1−xN nanocolumns grown on (111) silicon substrates and in thick AlxGa1−xN epitaxial layers deposited on sapphire. We demonstrate that carrier lifetime drops in nanocolumns by several times if compared to epilayers with similar Al content; in addition, recombination rate displays a strong nonlinearity on excitation. On the other hand, carrier localization effects observed in the epilayers completely disappear in nanocolumns.

year	journal	country	edition	language
2012-08-20	IOP Conference Series: Materials Science and Engineering

https://doi.org/10.1088/1757-899x/38/1/012054

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