摻雜InN薄膜的輸運(yùn)性質(zhì)與磁學(xué)性質(zhì)研究
[Abstract]:Semiconductor devices have a close dependence on the physical properties of semiconductor materials. In recent years, people have shown great interest in III-V primary semiconductors. InN has the lowest effective electron mass in third-group nitride semiconductors, which means that InN has a high mobility and high saturation rate, and attracts wide attention. With the development of thin film growth technology such as molecular beam epitaxy, the obtained high quality InN exhibits narrow energy gap, about 0.6 eV. In In1-xGaxN solid solution, the gap can be covered from near infrared to ultraviolet by changing the content of Ga. It has a good application value in photodiodes and becomes an important optoelectronic device material. High-quality InN or solid solution can be used in high-speed and long-distance communication because the band gap of material is equal to the wavelength of communication fiber. It has important application prospects in optical communication. Around the high quality InN thin films, the acceptor-type defects and other intrinsic defects were introduced into the materials through Mg, Ba, Zn, Mn doping and stress regulation on the basis of theoretical design by using non-equilibrium ion implantation technology. The p-type conduction of InN: Ba and InN: Zn was successfully reported, which became the two p-InN doped on the surface of Mg and formed the p-type conduction. In addition, the superconductivity in InN and the ferromagnetism induced by doping and stress are also reported. It is found that superconductivity and ferromagnetism coexist in doped InN. Finally, the work extends to the regulation behavior of polarity on oxide films, and the surface reconstruction of SrRu03 (111) films is measured and explained, which is the study of oxide-related heterojunctions. The main research contents are as follows: 1) P-type conductivity in two doped InN systems is obtained. In InN is + 3 valence. According to the theory of semiconductor doping, when ions with + 2 valence are doped in the system, substitution defects can be produced, acceptor-type energy levels can be produced in the band gap, and then the semiconductor system with hole as the main carrier can be obtained. However, it is difficult to realize hole doping due to the serious self-compensation of InN stable Fermi level in the conduction band. We use the first-principles calculation to search for ions with +2 valence doping and find that Mg, Sr, Zn, Mn, Ba and so on are expected to become acceptor impurities. In the case of InN:Ba thin films, X-ray diffraction and grazing incidence show that the substitution defect is successfully induced by Ba doping. With the increase of doping concentration, the photoinduced properties of InN:Ba thin films are studied. The luminescence spectrum gradually weakens and disappears due to the existence of holes in the main layer of the material and the potential difference between the surface electron aggregation layer and the surface electron aggregation layer, which prevents the recombination of photogenerated carriers. NN:Zn thin films have a positive Hall coefficient at low temperatures and a negative Hall coefficient as the temperature increases. The change of Hall coefficient symbols indicates that both electron and hole carriers exist in the system. The superconductivity of InN and InN:Zn thin films at low temperatures and their ferromagnetism have been investigated. It is found that the transition from normal state to superconducting state takes place near 3.8 K. This superconductivity is probably due to the interaction between the nearest in-plane atoms. Compared with the above two materials, the defects introduced by Zn ion doping pin the magnetic vortex lines. In the study of the Meissner effect of InN:Zn, we found that the hysteresis loops not only exhibit diamagnetism, but also ferromagnetic background. There are two electrons that make the p orbital of N atom in the doped material not completely full. According to Hund's rule, the electrons in the p orbital will appear spin polarization. When the spin polarization is correlated with each other, the magnetic long range order can be formed. In addition, the ferromagnetism in semiconductors can also come from its intrinsic defect. There is a large lattice mismatch between InN and SrRu03, and the growth of InN directly on A1203 can introduce in-vacancy intrinsic defects. Both experimental and theoretical studies show that in-vacancy caused by lattice mismatch can make InN films show ferromagnetism. Epitaxial SrRu03 (111) thin films have the strongest magnetism, which is related to the film thickness, growth quality and orientation. This result has aroused great interest. High quality SrRuO3 (111) thin films have been grown by pulsed laser deposition and surface reconstruction has been found. Thin films have been analyzed by angular resolution X-ray photoelectron spectroscopy. It is found that the reconstructions are due to the ordered oxygen vacancies on the surface of the films. Annealing the films in strong oxidizing environment can remove the surface reconstructions and further annealing in vacuum, the reconstructions occur again. Perovskite shows a strong polarity in the [111] direction. In order to reduce the surface polarity, the atoms will relax or spontaneously occur. The results are useful for the study of heterojunction based on SrRu03 (111).
【學(xué)位授予單位】:南京大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:O484
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