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Ab-initio modeling of acceptor-hydrogen complexes in CdTe

机译:CdTe中受体-氢配合物的从头算模型

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We have investigated the hydrogenation of group-V impurities (N-Te, P-Te and AS(Te)) in CdTe by computer modeling, using a pseudopotential density-functional method. For these complexes, we found that the lowest energy location for hydrogen is near the bond-center, closer to the acceptor atom, between a Cd atom and the acceptor. Metastable states by 0.5 eV above the ground state where found for structures where H is anti-bonding to N-Te, P-Te and AS(Te). The calculated local vibrational mode (LVM) frequencies for the bond centered configurations agree within 3% of the experimental values, i.e. 3210 cm(-1) for N-Te-H and 2022 cm(-1) for As-Te-H. Deuterium LVM induced shifts for As-Te-D fall within 4% of the experimental data. The observed wag mode for N-Te-H is reproduced within 8%. A wag mode for As-Te-H and LVM frequencies for P-Te-H are predicted. (c) 2006 Elsevier B.V. All rights reserved.
机译:我们已经通过计算机建模,使用拟势密度函数方法研究了CdTe中V组杂质(N-Te,P-Te和AS(Te))的氢化。对于这些络合物,我们发现氢的最低能量位置靠近Cd原子与受体之间的键中心,更靠近受体原子。在H与N-Te,P-Te和AS(Te)反键结合的结构中,亚稳态比基态高出0.5 eV。以键为中心的构型的计算出的局部振动模式(LVM)频率在实验值的3%之内,即N-Te-H为3210 cm(-1),As-Te-H为2022 cm(-1)。氘LVM引起的As-Te-D位移下降到实验数据的4%以内。观察到的N-Te-H摇摆模式在8%以内再现。预测了As-Te-H的摇摆模式和P-Te-H的LVM频率。 (c)2006 Elsevier B.V.保留所有权利。

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