摘要
Two kinds of short-period type II superlattices(SLs)InAs(6 monolayers(MLs))/GaSb(3 MLs)and InAs(8 MLs)/GaSb(8 MLs)which can serve for mid-infrared(MIR)detection have been grown by molecular beam epitaxy(MBE)on p-type GaSb(100)substrates.The cutoff wavelength for the two superlattices(SLs)was found to be around 4.8 lm at 300 K.The high resolution X-ray diffraction(HRXRD)measurements indicated that the InAs(8 MLs)/GaSb(8 MLs)SLs have better crystalline quality than that of the InAs(6 MLs)/GaSb(3 MLs)SLs.However,compared with infrared absorption in the 2.5–4.3 lm range,the optical absorption of InAs(6 MLs)/GaSb(3MLs)SLs was more excellent.This can be attributed to increase probability of the electron and hole wave function overlap in the thinner period thickness.
Two kinds of short-period type II superlattices （SLs） InAs （6 monolayers （MLs））/GaSb （3 MLs） and InAs （8 MLs）/GaSb （8 MLs） which can serve for mid-infrared （MIR） detection have been grown by molecular beam epitaxy （MBE） on p-type GaSh （100） substrates. The cutoff wavelength for the two superlattices （SLs） was found to be around 4.8 μm at 300 K. The high resolution X-ray diffraction （HRXRD） measurements indicated that the InAs （8 MLs）/GaSb （8 MLs） SLs have better crystalline quality than that of the InAs （6 MLs）/GaSb （3 MLs） SLs. How-ever, compared with infrared absorption in the 2.5-4.3μm range, the optical absorption of InAs （6 MLs）/GaSb （3 MLs） SLs was more excellent. This can be attributed to increase probability of the electron and hole wave function overlap in the thinner period thickness.
基金
supported by the National High Technology Research and Development Program of China (2011AA03A112, 2011AA03A106 and 2013AA03A101)
the National Natural Science Foundation of China (11204360, 61210014)
the Science & Technology Innovation Program of Guangdong Provincial Department of Education of China (2012CXZD0017)
the Industry-Academia-Research Union Special Fund of Guangdong Province of China (2012B091000169)
the Science & Technology Innovation Platform of Industry-AcademiaResearch Union of Guangdong Province-Ministry Cooperation Special Fund of China (2012B090600038)
