Effect of MBE growth conditions on GaAsBi photoluminescence lineshape and localised state filling.

Effect of MBE growth conditions on GaAsBi photoluminescence lineshape and localised state filling.
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DOI:
10.1038/s41598-021-04477-0
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发表时间:
2022-01-17
期刊:
影响因子:
4.6
通讯作者:
Richards RD
Richards RD
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Bailey NJ;Rockett TBO;Flores S;Reyes DF;David JPR;Richards RD

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A series of gallium arsenide bismide device layers covering a range of growth conditions are thoroughly probed by low-temperature, power-dependent photoluminescence measurements. The photoluminescence data is modelled using a localised state profile consisting of two Gaussians. Good agreement with the raw data is achieved for all layers whilst fixing the standard deviation values of the two Gaussians and constraining the band gap using X-ray diffraction data. The effects of growth temperature and bismuth beam equivalent pressure on the localised state distributions, and other model variables, are both shown to be linked to emission linewidth and device properties. It is concluded that bismuth rich surface conditions are preferable during growth in order to produce the narrowest emission linewidths with this material. These results also show how the growth mode of a gallium arsenide bismide layer can be inferred ex-situ from low-temperature photoluminescence measurements.
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