Comparison of CsBr and KBr covered Cu photocathodes: Effects of laser irradiation and work function changes

Weidong He; Subramanian Vilayurganapathy; Alan G. Joly; Tim C. Droubay; Scott A. Chambers; Juan R. Maldonado; Wayne P. Hess

doi:10.1063/1.4793214

Comparison of CsBr and KBr covered Cu photocathodes: Effects of laser irradiation and work function changes

Weidong He^*
, Subramanian Vilayurganapathy
, Alan G. Joly
, Tim C. Droubay
, Scott A. Chambers
, Juan R. Maldonado
, Wayne P. Hess

^*Corresponding author for this work

Pacific Northwest National Laboratory
Western Michigan University
not available
Stanford University

Research output: Contribution to journal › Article › peer-review

26 Scopus citations

Abstract

Thin films of CsBr and KBr were deposited on Cu(100) to investigate photoemission properties of these potential photocathode materials. After prolonged laser ultraviolet irradiation photoemission, quantum efficiency increases by factors of 26 and 77 for KBr/Cu(100) and CsBr/Cu(100) photocathodes, respectively. Immediately following thin film deposition, a decrease in work function is observed, compared to bare Cu, in both cases. Quantum efficiency enhancements are attributed to the decrease in photocathode work function, and photo-induced processes that introduce defect states into the alkali halide bandgap. Our results suggest that KBr, a relatively stable alkali-halide, also has potential for photocathode applications.

Original language	English
Article number	071604
Journal	Applied Physics Letters
Volume	102
Issue number	7
DOIs	https://doi.org/10.1063/1.4793214
State	Published - 18 Feb 2013
Externally published	Yes

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title = "Comparison of CsBr and KBr covered Cu photocathodes: Effects of laser irradiation and work function changes",

abstract = "Thin films of CsBr and KBr were deposited on Cu(100) to investigate photoemission properties of these potential photocathode materials. After prolonged laser ultraviolet irradiation photoemission, quantum efficiency increases by factors of 26 and 77 for KBr/Cu(100) and CsBr/Cu(100) photocathodes, respectively. Immediately following thin film deposition, a decrease in work function is observed, compared to bare Cu, in both cases. Quantum efficiency enhancements are attributed to the decrease in photocathode work function, and photo-induced processes that introduce defect states into the alkali halide bandgap. Our results suggest that KBr, a relatively stable alkali-halide, also has potential for photocathode applications.",

author = "Weidong He and Subramanian Vilayurganapathy and Joly, \{Alan G.\} and Droubay, \{Tim C.\} and Chambers, \{Scott A.\} and Maldonado, \{Juan R.\} and Hess, \{Wayne P.\}",

year = "2013",

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doi = "10.1063/1.4793214",

language = "英语",

volume = "102",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

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TY - JOUR

T1 - Comparison of CsBr and KBr covered Cu photocathodes

T2 - Effects of laser irradiation and work function changes

AU - He, Weidong

AU - Vilayurganapathy, Subramanian

AU - Joly, Alan G.

AU - Droubay, Tim C.

AU - Chambers, Scott A.

AU - Maldonado, Juan R.

AU - Hess, Wayne P.

PY - 2013/2/18

Y1 - 2013/2/18

N2 - Thin films of CsBr and KBr were deposited on Cu(100) to investigate photoemission properties of these potential photocathode materials. After prolonged laser ultraviolet irradiation photoemission, quantum efficiency increases by factors of 26 and 77 for KBr/Cu(100) and CsBr/Cu(100) photocathodes, respectively. Immediately following thin film deposition, a decrease in work function is observed, compared to bare Cu, in both cases. Quantum efficiency enhancements are attributed to the decrease in photocathode work function, and photo-induced processes that introduce defect states into the alkali halide bandgap. Our results suggest that KBr, a relatively stable alkali-halide, also has potential for photocathode applications.

AB - Thin films of CsBr and KBr were deposited on Cu(100) to investigate photoemission properties of these potential photocathode materials. After prolonged laser ultraviolet irradiation photoemission, quantum efficiency increases by factors of 26 and 77 for KBr/Cu(100) and CsBr/Cu(100) photocathodes, respectively. Immediately following thin film deposition, a decrease in work function is observed, compared to bare Cu, in both cases. Quantum efficiency enhancements are attributed to the decrease in photocathode work function, and photo-induced processes that introduce defect states into the alkali halide bandgap. Our results suggest that KBr, a relatively stable alkali-halide, also has potential for photocathode applications.

UR - https://www.scopus.com/pages/publications/84874545792

U2 - 10.1063/1.4793214

DO - 10.1063/1.4793214

M3 - 文章

AN - SCOPUS:84874545792

SN - 0003-6951

VL - 102

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 7

M1 - 071604

ER -

Comparison of CsBr and KBr covered Cu photocathodes: Effects of laser irradiation and work function changes

Abstract

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