Experiment and analysis of (Cs,O) activation for NEA photocathode preparation

Mathematics – Probability

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Scientific paper

On-line spectral response measurement technology and angular-dependent X-ray photoelectron spectroscopy (XPS) technology are firstly used to research the (Cs,O) activation of Gallium arsenide (GaAs) negative electron affinity (NEA) photocathode. Dynamic spectral response can be obtained from on-line spectral response measurement system and by use of the computer program for quantitative angular-dependent XPS, atom concentration and layer thickness of activation layer can be calculated. The photocathode properties for evaluating (Cs,O) activation, such as the surface electron escape probability, diffusion length and so on are also calculated by simulation method. From our experimental results, optimum cesium deposition quantity is obtained when photocurrent arrives at peak value and then decreases to 10% of the maximum, and optimum oxygen deposition quantity is obtained when photocurrent arrives at peak value and then decreases to 90% of the maximum. And the photoemission peaks at 0.71 monolayer of Cs coverage. In our experimental system the optimum thickness of activation layer is 0.82 nm and interfacial oxidation layer is 0.2 nm for successfully activated GaAs NEA photocathode. Mechanism of interfacial barrier formation and effect of oxygen on the surface of activation layer are explained.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Experiment and analysis of (Cs,O) activation for NEA photocathode preparation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Experiment and analysis of (Cs,O) activation for NEA photocathode preparation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Experiment and analysis of (Cs,O) activation for NEA photocathode preparation will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1129796

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.