Quantum Efficiency Enhancement in CsI/Metal Photocathodes

Journal Article · Sun Feb 01 00:00:00 EST 2015 · Chemical Physics Letters, 621:155-159

DOI:https://doi.org/10.1016/j.cplett.2015.01.010· OSTI ID:1184928

Kong, Lingmei; Joly, Alan G.; Droubay, Timothy C.; Hess, Wayne P.

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