The Surface Activation Layer of GaAs Negative Electron Affinity Photocathode Activated by Cs, Li and NF3
Journal Article
·
· Submitted to Applied Physics Letters
OSTI ID:969257
The lifetime of GaAs photocathodes can be greatly improved by introducing Li in the Cs+NF{sub 3} activation process. The surface activation layer of such photocathodes is studied by synchrotron radiation photoemission and is compared with GaAs photocathodes activated without Li. The charge distributions of N, F and Cs experience significant changes when Li is added in the activation. In addition, the presence of Li causes NF{sub x} molecules to take an orientation with F atoms on top. All these changes induced by Li hold the key for the lifetime improvement of GaAs photocathodes.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 969257
- Report Number(s):
- SLAC-PUB-13810; TRN: US1000226
- Journal Information:
- Submitted to Applied Physics Letters, Journal Name: Submitted to Applied Physics Letters
- Country of Publication:
- United States
- Language:
- English
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