Irradiation effects on the structural and optical properties of single crystal β-Ga2O3
Irradiation effects on the structural and optical properties of single crystal β-Ga2O3
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辐照对单晶β-Ga2O3结构和光学性质的影响
DOI：
10.1088/1361-6641/aad8d1
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发表时间：
2018-09-01
影响因子：
1.9
通讯作者：
Zhou, Shengqiang
中科院分区：
文献类型：
--
作者：
Liu, Chaoming;Berencen, Yonder;Zhou, Shengqiang
在本工作中，我们报道了n型单晶β-Ga_2O_3在不同注量下的25 MeV氧辐照效应。我们证明了随着O辐照剂量的增加，GaO_4和GaO_6单元的对称伸缩模式和弯曲振动都受到了削弱。蓝光和绿光发射带主要与镓-氧双空位、镓空位和氧间隙有关。低注量下光学活性中心的增加和高注量下的荧光猝灭分别归因于载流子浓度的降低和非辐射复合中心的产生。这些结果设想了通过改变氧辐照通量来获得预先设计的光谱行为的可能性。
In- the present work, we report the 25 MeV oxygen irradiation effects in n-type single crystal beta-Ga2O3 at different fluences. We demonstrate that the symmetric stretching modes and bending vibrations of GaO4 and GaO6 units are impaired upon increasing O irradiation fluence. Blue and green photoluminescence (PL) emission bands are found to be mainly associated with gallium- oxygen divacancies, gallium vacancies and oxygen interstitials. The increase of optically active centers at low fluence and the PL quenching at high fluence are ascribed to the reduction of carrier density and the production of non-radiative recombination centers, respectively. The results envisage the possibility of obtaining pre-designed spectral behaviors by varying the oxygen irradiation fluence.