Quantum Efficiency Enhancement in CsI/Metal Photocathodes
Journal Article
·
· Chemical Physics Letters, 621:155-159
High quantum efficiency enhancement is found for hybrid metal-insulator photocathodes consisting of thin films of CsI deposited on Cu(100), Ag(100), Au(111) and Au films irradiated by 266 nm laser pulses. Low work functions (near or below 2 eV) are observed following ultraviolet laser activation. Work functions are reduced by roughly 3 eV from that of clean metal surfaces. We discuss various mechanisms of quantum efficiency enhancement for alkali halide/metal photocathode systems and conclude that the large change in work function, due to Cs accumulation of Cs metal at the metal-alkali halide interface, is the dominant mechanism for quantum efficiency enhancement
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1184928
- Report Number(s):
- PNNL-SA-107505
- Journal Information:
- Chemical Physics Letters, 621:155-159, Journal Name: Chemical Physics Letters, 621:155-159
- Country of Publication:
- United States
- Language:
- English
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