Persistent optical phenomena in oxide semiconductors
Persistent optical phenomena in oxide semiconductors
复制标题
氧化物半导体中的持久光学现象
DOI：
10.1117/12.2648437
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
McCloy, John S.
中科院分区：
文献类型：
--
作者：
McCluskey, Matthew D.;Pansegrau, Christopher;Ahmed, Syeed E.;Santillan, Macarena;Jesenovec, Jani;McCloy, John S.
透明氧化物半导体与光的相互作用对于一系列应用至关重要。持续效应可以用于全息存储器或光学限定电路。相反，它们也可能对设备操作有害。大，室温下的持久光电导（PPC）被发现在钛酸锶（SrTiO 3，STO）在含氢气氛中退火后。钛酸钡（BaTiO 3，BTO），一种铁电材料，最近发现也表现出PPC。在亚带隙光照射下，Cu掺杂的氧化镓（β-Ga 2 O3）发生了室温光暗化。氢被认为在这些持续存在的现象中发挥着核心作用。在提出的模型中，光子激发替代氢（氧空位内的质子），使缺陷不稳定。质子离开并结合到主体氧原子上，形成O-H键，用红外光谱法观察到。留下氧空位。因为STO和BTO中的氧空位是浅施主，所以该过程导致PPC。而在β-Ga_2O_3：Cu中，氧空位与Cu受主相邻。在这种情况下，光激发导致稀有的Cu 3+状态，其吸收可见光。这种效应可以通过在300-400°C下退火来“消除”。
The interaction of transparent oxide semiconductors with light is critically important for a range of applications. Persistent effects could be exploited for holographic memory or optically defined circuits. Conversely, they may also be detrimental to device operation. Large, room-temperature persistent photoconductivity (PPC) was discovered in strontium titanate (SrTiO3, STO) after annealing in a hydrogen-containing atmosphere. Barium titanate (BaTiO3, BTO), a ferroelectric material, was recently found to also exhibit PPC. Room-temperature photodarkening was observed in Cu-doped gallium oxide (β-Ga2O3) after exposure to sub-bandgap light. Hydrogen is believed to play a central role in these persistent phenomena. In the proposed model, a photon excites substitutional hydrogen (a proton inside an oxygen vacancy), making the defect unstable. The proton leaves and binds to a host oxygen atom, forming an O-H bond that is observed with infrared spectroscopy. An oxygen vacancy is left behind. Because oxygen vacancies in STO and BTO are shallow donors, this process results in PPC. In β-Ga2O3:Cu, however, the oxygen vacancy neighbors a Cu acceptor. In that case, photoexcitation results in the rare Cu3+state, which absorbs visible light. The effect can be “erased” by annealing at 300-400°C.
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影响因子：
3.7
作者：
Choi, Minseok;Oba, Fumiyasu;Tanaka, Isao
通讯作者：
Tanaka, Isao
Cu 掺杂 β-Ga_{2}O_{3} 中的持续室温光暗化。
影响因子：
8.6
作者：
J. Jesenovec;C. Pansegrau;M. McCluskey;J. McCloy;T. Gustafson;L. Halliburton;J. Varley
通讯作者：
J. Varley
SrTiO3 中的氢化空位和隐藏氢
DOI：
--
发表时间：
2014
期刊：
影响因子：
--
作者：
J. Varley;A. Janotti;C. Walle
通讯作者：
C. Walle
影响因子：
2.1
作者：
Ahmed, Syeed E.;Poole, Violet M.;McCluskey, Matthew D.
通讯作者：
McCluskey, Matthew D.
影响因子：
3.2
作者：
Pansegrau, Christopher;McCluskey, Matthew D.
通讯作者：
McCluskey, Matthew D.