Optoelectronic Technology, Volume. 41, Issue 1, 17(2021)
Research on the Influence of Foreign Gases on the Optoelectronic Properties of Ga0.75Al0.25N Photocathode Surface
Based on the detection results of quadrupole mass spectrometer (QMS) on ultra high vacuum system, the adsorption systems of residual gases adsorbed on Ga0.75Al0.25N(0001) surface were built. Based on density function theory(DFT), the adsorption of residual gases on Ga0.75Al0.25N(0001) surface was calculated. Results show that residual gases enhance the surface work function. The changes of the work function were caused by the dipole moments between the adsorbates and the surface. The dipole moments caused by residual gases pointed to the surface from bulk, which was harmful for electron escaping from surface into vacuum. At the ultraviolet waveband, the absorption coefficients of surfaces with foreign gases were smaller than that of the Cs adsorbed surface.
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Yuxuan ZHU, Mingzhu YANG, Siyi HE. Research on the Influence of Foreign Gases on the Optoelectronic Properties of Ga0.75Al0.25N Photocathode Surface[J]. Optoelectronic Technology, 2021, 41(1): 17
Category: Technology and Measurement
Received: Oct. 9, 2020
Accepted: --
Published Online: Jul. 14, 2021
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