LaCrO3（111）晶面的Cr原子排布具有六角蜂窝状结构，上下子格Cr原子为G型反铁磁序交错排列，理论研究表明如果在两层蜂窝状结构中间夹杂不同的钙钛矿型过渡金属氧化物，通过外加电场调控其自旋轨道耦合强度，有可能在其中实现量子自旋霍尔效应。因此，开展LaCrO3（111）这种典型的钙钛矿型过渡金属氧化物的研究有着非常重要的物理意义。本论文利用激光脉冲沉积法制备了高质量的LaCrO3/SrTiO3（111）薄膜，并对该异质结界面的能带结构进行了系统的研究，得到了以下的研究结果： ¬成功地制备了高质量的、原子级平整的LaCrO3/SrTiO3（111）薄膜。通过对SrTiO3（111）衬底进行处理，得到了原子级平整的Ti终结表面，采用脉冲激光沉积法在SrTiO3（111）衬底上外延生长了高质量的LaCrO3薄膜。AFM测试表明薄膜具有原子级平整度；XRD测试表明薄膜具有单一（111）取向；EDX测试表明薄膜的La：Cr成分比为1：1。界面导电性测试表明，在10-6Torr氧压下，界面具有金属性，制备氧压大于10-6Torr时界面为绝缘性。 确定了LaCrO3/SrTiO3（111）异质结界面的能带排列图， SrTiO3一侧能带在界面处向下弯曲，费米面穿过其所形成的电子势阱，预示了该界面有望实现金属性。运用XPS手段对在SrTiO3衬底上生长的不同厚度的LaCrO3异质结的Sr元素、Ti元素、La元素以及Cr元素的结合能进行了测量，发现结合能的位置随着LaCrO3薄膜厚度的增加而偏移，在界面处两侧能带均向下弯曲。价带谱测量表明，LaCrO3一侧的价带顶距费米面位置为1.73eV。通过计算给出了LaCrO3/SrTiO3（111）异质结的价带和导带能带偏移量分别为1.42±0.13eV和1.52±0.13eV，并得到了LaCrO3/SrTiO3（111）异质结界面的能带排列图。能带结构表明，由于SrTiO3一侧能带在界面处向下弯曲，费米面穿过其所形成的电子势阱，预示了该界面有望实现金属性。

Cr ions of LaCrO3(111) are located in a honeycomb lattice, consisting of two trigonal sublattices on different layers. Magnetic moments of adjacent Cr ions align antiferromagnetically in the two sublattices of the buckled honeycomb lattice. Theoretical study shows that one unit-cell of another perovskite-type transition-metal oxide grown between this (111) honeycomb lattice are possible to realize quantum spin Hall effect, while the spin-orbit coupling is tuned by electric field. So it is of great scientific significance to study LaCrO3(111). In this paper high-quality epitaxial films of LaCrO3/SrTiO3(111) was prepared by pulsed laser deposition (PLD) method, and band alignment of the LaCrO3/SrTiO3(111) heterojunctions was studied systematically. Several results were obtained as follows.1) High quality and atomically-flat thin films of LaCrO3/SrTiO3(111) were fabricated successfully. Atomically flat, Ti-terminated SrTiO3(111) substrates were first prepared after series of treatments. High-quality epitaxial thin films of LaCrO3 were grown by PLD on SrTiO3(111) substrate. Atomic force microscopy examinations indicated that the films were atomically flat; X-ray diffraction patterns indicated that the films were epitaxial with single phase character and (111) orientation; Energy dispersive X-ray analyses gave a La/Cr ratio of about 1:1; Electrical transport measurements showed that the interface was metallic when films were prepared with an O2 pressure less than 10-6 Torr, while the interface was insulating when the O2 pressure was greater than 10-6 Torr. 2) Band alignment of LaCrO3/SrTiO3(111) hetero-interfaces is determined. There is downward band bending at SrTiO3 side toward the interface, Fermi level (EF) passes through the potential well, which indicates this hetero-interfaces is promising to be metallic. Sr 3d, La 4d,Ti 2p and Cr 3p core-level spectra of LaCrO3(111) thin films with different thicknesses deposited on SrTiO3(111) substrates were measured by X-ray photoemission spectroscopy. Results showed that binding energy shifted with film’s thickness and bands bended downward toward the interface. Valence band spectra of LaCrO3 film showed that the distance between Fermi surface and the top of valence band was 1.73 eV. Calculated results showed that the valence band offset and conduction band offset of LaCrO3/SrTiO3(111) heterojunction were 1.42±0.13eVand1.52±0.13eV,respectively. Band alignment of LaCrO3/SrTiO3(111) hetero-interfaces was then determined. It is shown that the band bends downward toward the interface at both sides of the interface with the EF located inside the conduction band of SrTiO3, which indicates this hetero-interfaces is promising to be metallic.