Bandgap evolution of diamond

被引：20
作者：
Cheng, Lu [1 ]
Zhu, Siqi [1 ]
Ouyang, Xiaoping [2 ,3 ,4 ]
Zheng, Wei [1 ]
机构：
[1] Sun Yat Sen Univ, Sch Mat, State Key Lab Optoelect Mat & Technol, Shenzhen 518107, Peoples R China
[2] Xiangtan Univ, Sch Mat Sci & Engn, Xiangtan 411105, Peoples R China
[3] Northwest Inst Nucl Technol, State Key Lab Intense Pulsed Radiat Simulat & Effe, Xian 710024, Peoples R China
[4] Northwest Inst Nucl Technol, Radiat Detect Res Ctr, Xian 710024, Peoples R China
来源：
DIAMOND AND RELATED MATERIALS | 2023年 / 132卷
关键词：
Diamond; Bandgap; Temperature dependence; TEMPERATURE-DEPENDENCE; THERMAL-EXPANSION; GAP; ABSORPTION;
D O I：
10.1016/j.diamond.2022.109638
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
As an indirect-bandgap material, diamond owns an inter-band transition absorption belonging to the phonon -assisted indirect transition process whose image is complex due to a many-body interaction among electrons, phonons, and photons. Therefore, research on the indirect bandgap of diamond has been a bottleneck hard to break through. Here, systematical measurement and analysis are conducted on the temperature dependence of phonon-assisted intrinsic absorption edge of high-quality electronic-grade diamond in a wide range (10-620 K). Combined the findings with an image model of the indirect phonon-assisted transition of diamond, a more ac-curate bandgap value of diamond (Eg = 5.480 +/- 0.004 eV) is obtained with the temperature dependence of its bandgap also measured in a wide temperature range in detail. According to the results obtained, this work is hoped to offer more accurate reference for diamond in the aspects of indirect bandgap and temperature dependence.
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页数：5
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