Microstructure and Band Gap Modulation of SrSn_1-<i>x</i>Co_<i>x</i>O₃ Epitaxial Thin Films <i>via</i> Pulsed Laser Deposition

Abstract

摘要：钙钛矿结构 SrSnO3因其独特的介电和半导体性质而备受关注，通过掺杂可显著调控其电学、磁学性 能，拓宽其应用范围。本研究在单晶 SrTiO3(001)衬底上通过脉冲激光方法外延生长了 SrSn1-xCoxO3 (x = 0, 0.16, 0.33, 0.5) (SSCO)薄膜，探究了 Co 含量对薄膜结晶性、微观结构、光学性能以及介电性能的影响。结 果表明，SrSn1-xCoxO3薄膜可在 SrTiO3(001)衬底上外延生长，Co 掺杂不会导致薄膜结晶质量的劣化。薄膜表 面形貌平整、致密，膜厚 200 nm，表面粗糙度为 0.44 nm。随薄膜中 Co 掺杂量增加，薄膜透过率从 90%降

Room-temperature ferromagnetism and oxygen pressure-dependent optical, ferromagnetic properties in SrSn0.5Co0.5O3 thin films

“…Shein et al [17] predicted that the band gap of SrSnO 3 could be as low as 0.7 eV by doping Fe and Co. The optical band gap of 2.36 eV was realized in epitaxial SrSn 1−x Fe x O 3 films on MgO [18] and 2.44 eV in epitaxial SrSn 1−x Co x O 3 films on SrTiO 3 (STO) [19]. There is no report on the ferromagnetism of thin films up to now, though weak ferromagnetism was reported in bulk SrSnO 3 doped by Fe or Cr [20,21].…”