Urbach tail and nonuniformity probe of HgCdTe thin films and quantum well heterostructures grown by molecular beam epitaxy

Vladimir V. Rumyantsev; Anna A. Razova; Mikhail A. FadeevVladimir V. UtochkinNikolai N. MikhailovSergey A. DvoretskyVladimir I. GavrilenkoSergey V. Morozov

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Urbach tail and nonuniformity probe of HgCdTe thin films and quantum well heterostructures grown by molecular beam epitaxy

机译：Urbach tail and nonuniformity probe of HgCdTe thin films and quantum well heterostructures grown by molecular beam epitaxy

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Temperature-driven photoconductivity spectra are studied in HgCdTe thin films and quantum well (QW) heterostructures grown by molecular beam epitaxy (MBE). It is shown that the absorption edge steepness in narrow gap HgCdTe epilayers approaches the fundamental limit. The corresponding Urbach energy is 1.5 to 4 meV at 4.2 to 77 K, which is an order of magnitude lower than values reported previously, indicating a significant progress in the quality of structures grown by MBE. Auger-suppressed multi-QW heterostructures that can be used for development of long-wavelength lasers/detectors are shown to have the comparable steepness of the absorption edge. The corresponding "Urbach" energy is much less than the threshold energy of the Auger recombination, which means that furthering the operating wavelengths beyond 20 μm is feasible for optoelectronic devices based on HgCdTe structures.

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来源
《Optical Engineering》 |2021年第8期|082007-1-082007-9|共9页
作者
Vladimir V. Rumyantsev; Anna A. Razova; Mikhail A. FadeevVladimir V. UtochkinNikolai N. MikhailovSergey A. DvoretskyVladimir I. GavrilenkoSergey V. Morozov;
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作者单位

Institute for Physics of Microstructures of RAS, Nizhny Novgorod, Russia;

Siberian Branch of Russian Academy of Sciences, Institute of Semiconductor Physics, Novosibirsk, Russia;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类计量学;
关键词
HgCdTe; photoconductivity; Urbach tail; molecular beam epitaxy; infrared spectroscopy;

Urbach tail and nonuniformity probe of HgCdTe thin films and quantum well heterostructures grown by molecular beam epitaxy

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