梯度掺杂结构GaN光电阴极的稳定性

李飙; 任艺; 常本康

doi:10.3788/CO.20181104.0677

Volume 11 Issue 4

Jul. 2018

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Article Contents

Chinese Optics > 2018 > 11(4): 677-683.

LI Biao, REN Yi, CHANG Ben-kang. Stability of gradient-doping GaN photocathode[J]. Chinese Optics, 2018, 11(4): 677-683. doi: 10.3788/CO.20181104.0677

Citation:

LI Biao, REN Yi, CHANG Ben-kang. Stability of gradient-doping GaN photocathode[J]. Chinese Optics, 2018, 11(4): 677-683. doi: 10.3788/CO.20181104.0677

LI Biao, REN Yi, CHANG Ben-kang. Stability of gradient-doping GaN photocathode[J]. Chinese Optics, 2018, 11(4): 677-683. doi: 10.3788/CO.20181104.0677

Citation:

LI Biao, REN Yi, CHANG Ben-kang. Stability of gradient-doping GaN photocathode[J]. Chinese Optics, 2018, 11(4): 677-683. doi: 10.3788/CO.20181104.0677

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Stability of gradient-doping GaN photocathode

doi: 10.3788/CO.20181104.0677

LI Biao^{1
,
,},
REN Yi²,
CHANG Ben-kang³

1.
School of Electronic and Electrical Engineering, Shangqiu Normal University, Shangqiu 476000, China
2.
Department of Electrical and Mechanical Engineering, Shangqiu Polytechnic, Shangqiu 476000, China
3.
Institute of Electronic Engineering and Optoelectronic Technology, Nanjing University of Science and Technology, Nanjing 210094, China

Funds:

National Natural Science Foundation of Chin No.61171042

More Information

Corresponding author: LI Biao, E-mail:libiao2006@126.com
Received Date: 27 Dec 2017
Rev Recd Date: 30 Jan 2018
Publish Date: 01 Aug 2018

Abstract

Abstract

The GaN photocathode multi-information measurement and evaluation system is used to test the quantum efficiency of the reflective gradient-doped and uniformly doped GaN photocathode samples after activation and attenuation, and the attenuation rate test is performed. The gradient-doped sample has a smaller attenuation ratio and a slower decay rate than the uniform-doped sample within the same decay time because the gradient-doped structure can generate a series of built-in electric fields inside the emissive layer. As a result, the energy band can be continuously bent downwards, resulting in a lower surface vacuum level than that of the uniformly doped sample, and the negative electron affinity formed on the surface of the emission layer is more pronounced, resulting in easier escape of photogenerated electrons in the emission layer. The decay of the cathode quantum efficiency becomes slower, making it more stable than uniform-doped structures.
- GaN,
- photocathode,
- gradient-doping,
- built-in electric field,
- stability

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References(23)

References

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