Effect of Rb Doping on Photoelectric Properties of K-Cs-Sb Cathode Material

$Optical properties of K-Cs-Rb-Sb bulk models with different Cs/Rb ratios. (a) Reflectivity; (b) refractive index; (c) extinction coefficient; (d) absorption coefficient$

Fig. 3. Optical properties of K-Cs-Rb-Sb bulk models with different Cs/Rb ratios. (a) Reflectivity; (b) refractive index; (c) extinction coefficient; (d) absorption coefficient

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Fig. 4. Band structures of K-Cs-Rb-Sb bulk models with different Cs/Rb ratios

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Fig. 5. Work function and surface energy of K-Cs-Rb-Sb (111) surface models with different Cs/Rb ratios

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Table 1. Band gaps of K-Cs-Rb-Sb bulk models with different Cs/Rb ratios
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Table 1. Band gaps of K-Cs-Rb-Sb bulk models with different Cs/Rb ratios
Model Band gap /eV
K₂CsSb 0.844
K₂Cs_0.75Rb_0.25Sb 0.736
K₂Cs_0.5Rb_0.5Sb 0.678
K₂Cs_0.25Rb_0.75Sb 0.660
K₂RbSb 0.677

Table 2. Vacuum level, valence band top energy, and ionization energy of K-Cs-Rb-Sb (111) surface models with different Cs/Rb ratios

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Table 2. Vacuum level, valence band top energy, and ionization energy of K-Cs-Rb-Sb (111) surface models with different Cs/Rb ratios

Model	Vacuum level /eV	Valence band top enengy /eV	Ionization energy /eV
K₂CsSb	3.185	-0.7275	3.9125
K₂Cs_0.75Rb_0.25Sb	3.136	-0.6782	3.8142
K₂Cs_0.5Rb_0.5Sb	3.044	-0.8117	3.8557
K₂Cs_0.25Rb_0.75Sb	2.947	-0.8189	3.7659
K₂RbSb	2.885	-0.9205	3.8055

Table 3. Electron effective mass of K-Cs-Rb-Sb (111) surface models with different Cs/Rb ratios
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Table 3. Electron effective mass of K-Cs-Rb-Sb (111) surface models with different Cs/Rb ratios
Model Electronic effective mass
K₂CsSb 0.0238m₀
K₂Cs_0.75Rb_0.25Sb 0.0234m₀
K₂Cs_0.5Rb_0.5Sb 0.0233m₀
K₂Cs_0.25Rb_0.75Sb 0.0197m₀
K₂RbSb 0.0193m₀

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Yunfeng Han, Muchun Jin, Ling Ren, Xingchao Wang, Kaimin Zhang, Xiaorong Liu, Yunsheng Qian, Yijun Zhang. Effect of Rb Doping on Photoelectric Properties of K-Cs-Sb Cathode Material[J]. Acta Optica Sinica, 2024, 44(4): 0416001

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Paper Information

Category: Materials

Received: Sep. 14, 2023

Accepted: Nov. 30, 2023

Published Online: Feb. 29, 2024

The Author Email: Yijun Zhang (zhangyijun423@126.com)

DOI:10.3788/AOS231553

CSTR:32393.14.AOS231553

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Band gaps of K-Cs-Rb-Sb bulk models with different Cs/Rb ratios

Table 1. Band gaps of K-Cs-Rb-Sb bulk models with different Cs/Rb ratios

Table 2. Vacuum level, valence band top energy, and ionization energy of K-Cs-Rb-Sb (111) surface models with different Cs/Rb ratios

Table 2. Vacuum level, valence band top energy, and ionization energy of K-Cs-Rb-Sb (111) surface models with different Cs/Rb ratios

Table 3. Electron effective mass of K-Cs-Rb-Sb (111) surface models with different Cs/Rb ratios

Table 3. Electron effective mass of K-Cs-Rb-Sb (111) surface models with different Cs/Rb ratios