CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
Prev
Next
|
|
|
Photoemission of graded-doping GaN photocathode |
Fu Xiao-Qian(付小倩)a)b), Chang Ben-Kang(常本康) a)†, Wang Xiao-Hui(王晓晖)a), Li Biao(李飙)a), Du Yu-Jie(杜玉杰)a), and Zhang Jun-Ju(张俊举)a) |
a Institute of Electronic Engineering and Optoelectronic Technology, Nanjing University of Science and Technology, Nanjing 210094, China; b School of Information Science and Engineering, University of Jinan, Jinan 250022, China |
|
|
Abstract We study the photoemission process of graded-doping GaN photocathode and find that the built-in electric fields can increase the escape probability and the effective diffusion length of photo-generated electrons, which results in the enhancement of quantum efficiency. The intervalley scattering mechanism and the lattice scattering mechanism in high electric fields are also investigated. To prevent negative differential mobility from appearing, the surface doping concentration needs to be optimized, and it is calculated to be 3.19×1017 cm-3. The graded-doping GaN photocathode with higher performance can be realized by further optimizing the doping profile.
|
Received: 01 July 2010
Revised: 11 October 2010
Accepted manuscript online:
|
PACS:
|
79.60.-i
|
(Photoemission and photoelectron spectra)
|
|
61.72.U-
|
(Doping and impurity implantation)
|
|
85.60.Ha
|
(Photomultipliers; phototubes and photocathodes)
|
|
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 60871012) and the Research Fund of Nanjing University of Science and Technology (Grant No. 2010ZYTS032). |
Cite this article:
Fu Xiao-Qian(付小倩), Chang Ben-Kang(常本康), Wang Xiao-Hui(王晓晖), Li Biao(李飙), Du Yu-Jie(杜玉杰), and Zhang Jun-Ju(张俊举) Photoemission of graded-doping GaN photocathode 2011 Chin. Phys. B 20 037902
|
[1] |
Bell R L, James L W and Moon R L 1974 Appl. Phys. Lett. 25 645
|
[2] |
Gregory P E, Escher J S, Hyder S B, Houng Y M and Antypas G A 1978 J. Vac. Sci. Technol. 15 1483
|
[3] |
Gregory P E, Escher J S, Saxena R R and Hyder S B 1980 Appl. Phys. Lett. 36 639
|
[4] |
Niigaki M, Hirohata T, Suzuki T, Kan H and Hiruma T 1997 Appl. Phys. Lett. 71 2493
|
[5] |
Yang Z, Chang B K, Zou J J, Qiao J L, Gao P, Zeng Y P and Li H 2007 Appl. Opt. 46 7035
|
[6] |
Niu J, Yang Z and Chang B K 2009 Chin. Phys. Lett. 26 104202
|
[7] |
Zhang Y J, Chang B K, Yang Z, Niu J and Zou J J 2009 Chin. Phys. B 18 4541
|
[8] |
Zou J J, Chang B K and Yang Z 2007 Acta Phys. Sin. 56 2992 (in Chinese)
|
[9] |
Niu J, Yang Z, Chang B K, Qiao J L and Zhang Y J 2009 Acta Phys. Sin. 58 5002 (in Chinese)
|
[10] |
Spicer W E 1958 Phys. Rev. 112 114
|
[11] |
Zhang Y J, Chang B K, Yang Z, Niu J, Xiong Y J, Shi F, Guo H and Zeng Y P 2009 Appl. Opt. 48 1715
|
[12] |
Liu E K, Zhu B S and Luo J S 2003 Semiconducting Physics (Beijing: Publishing House of Electronics Industry) (in Chinese) pp202, 136, 132
|
[13] |
Liu Z, Machuca F, Pianetta P, Spicer W E and Pease R F W 2004 Appl. Phys. Lett. 85 1541
|
[14] |
Albrecht J D, Ruden P P, Limpijumnong S, Lambrecht W R L and Brennan K F 1999 J. Appl. Phys. 86 6864
|
[15] |
Brazis R and Raguotis R 2004 Appl. Phys. Lett. 85 609
|
[16] |
Barker J M, Akis R, Thornton T J, Ferry D K and Goodnick S M 2002 Phys. Stat. Sol. (a) 190 263
|
[17] |
Brazel E G, Chin M A, Narayanamurti V, Kapolnek D, Tarsa E J and DenBaars S P 1997 Appl. Phys. Lett. 70 330 endfootnotesize
|
No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
Altmetric
|
blogs
Facebook pages
Wikipedia page
Google+ users
|
Online attention
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
View more on Altmetrics
|
|
|