First-principles Calculation of AlN Electronic Structure by Doping with Zn and Cd

DONG Yu-cheng; GUO Zhi-you; BI Yan-jun; LIN Zhu

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First-principles Calculation of AlN Electronic Structure by Doping with Zn and Cd

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- First-principles Calculation of AlN Electronic Structure by Doping with Zn and Cd
- Chinese Journal of Luminescence Vol. 30, Issue 3, Pages: 314-320(2009)
- 作者机构：
  
  华南师范大学光电子材料与技术研究所,广东广州,510631
- 作者简介：
- 基金信息：
- DOI：
  CLC： O471.5
- Received：30 June 2008，
  
  Revised：02 January 1900，
  
  Published Online：30 June 2009，
  
  Published：30 June 2009
- 稿件说明：
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DONG Yu-cheng, GUO Zhi-you, BI Yan-jun, et al. First-principles Calculation of AlN Electronic Structure by Doping with Zn and Cd[J]. Chinese journal of luminescence, 2009, 30(3): 314-320.
DOI：

DONG Yu-cheng, GUO Zhi-you, BI Yan-jun, et al. First-principles Calculation of AlN Electronic Structure by Doping with Zn and Cd[J]. Chinese journal of luminescence, 2009, 30(3): 314-320. DOI：

摘要

基于密度泛函理论(DFT)框架下的第一性原理的平面波超软赝势方法(USPP)

对Zn

Cd掺杂AlN的32原子超原胞体系进行了几何结构优化

从理论上给出了掺杂和非掺杂体系的晶体结构参数。计算了掺杂AlN晶体的结合能、电子态密度、差分电荷密度

并对计算结果进行了细致的分析。计算结果表明

Cd、Zn都可以提供很多的空穴态

是良好的p型掺杂剂

但是相对于Cd

Zn原子在AlN晶体中的溶解度更大

并且可以提供更多的空穴

有利于形成更好的p型电导。

Abstract

AlN is a new type of direct wide bandgap Ⅲ-V nitride semiconductor material.Because the AlN possesses of many interesting physics characteristics

it has attracted huge attention on potential applications. In addition

AlN is a type of direct bandgap semiconductor material with a very wide direct bandgap of 6.2 eV

as solid-state light sources

which are in the process of profoundly changing the way that human generates light for general lighting applications. Solid-state light sources possess of two highly desirable features

which set them apart from most other light sources: (i) they have the potential to create light with essentially unit power efficiency and (ii) the properties of light can be controlled to a degree.In another actual application

AlN as a kind of high-efficiency ultraviolet solid-state light sources is greatly important material to develop short wavelength ultraviolet light-emitting diodes. Microelectronic fabrication technologies and the enviromental sciences both require light source with shorter emission wavelengths

such as the former to imporve resolution in photolithography and the latter for sensors that can instantaneously detect hazardous particles. Furthermore

ultraviolet solid-state light sources are also attracting attention for potential applications in high-density optical data storage

biomedical research

water and air purification

and sterilization.In recent years

the great importance of semiconductor material has been realized in the fabrication of the shoter emission wavelength light-emitting diodes

resulting in research on AlN thin film. At present

resear-chers have completed Si doped AlN n-type conduction with very strong conductivity. Lately

Nepal

et al.

made use of Zn doping to obtain p-type AlN.However

the efficiency of doping is quite low

the p-type AIN possesses of lower quantum energy

and the acceptor compositions need to be detected further.In this paper

we studied the efficiency of Zn and Cd as p-type doping in wurtzite AlN crystals. In the present study we performed the geometrical structure of Zn and Cd doped 32 atoms supercell of AlN

which is optimized by adopting the ultra-soft pseudopotential method of total-energy plan wave based on the destiny functional theory(DFT). Cell parameters of both undoped and doped cells were calculated theoretically. Binding energy

partial destiny of state and electron destiny differences of doped AlN crystals were calculated and discussed in detail. We focus our attention on whether the doping can provide enough holes in doped AlN crystals. The result of our calculation revealed the fact that both Cd and Zn atoms can provide a good deal of the state holes

which means that both of them are well p-type doping

nevertheless

comparing with Cd

Zn has a better solubility in AlN crystals

because Zn in AlN crystals can provide more the state of hole

which is propitious to come into being better p-type conduction. We prove that Zn is a better p-type doping ion than Cd.

关键词

Keywords

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