Study of Iron or Zinc doped Indium Phosphide under High Pressure

• Main Author: 林信誠
• Other Authors: 林志明
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/97096869303928007756

碩士 === 國立新竹教育大學 === 應用科學系碩士班 === 102 === Using ADXRD (angle-dispersive Ｘ-Ray diffraction) and Raman spectroscopy, discussed physical properties of Iron doped indium phosphide (InP:Fe) and Zinc doped indium phosphide (InP:Zn) under high pressure. Because different doping mechanism, cause the pressure have different degrees of impact on InP:Fe and InP:Zn. In addition, Using XANES(Ｘ-Ray absorption near-edge structure) to confirm the valence of Iron is trivalent ions forming ionic bonds with phosphorous in InP:Fe. The results showed that both the InP:Fe and InP:Zn are transform from zincblende structure to rock-salt structure and metallic under high pressure. Through the ADXRD data can found the begin phase transition pressure is almost the same with InP:Fe and InP:Zn, at 8.2(2) GPa and 8.6(1) GPa, respectively. The Weight Fraction change pressure and phase transition finish pressure of InP:Fe is at 10.4(1) and 16.0(2) GPa which is higher than InP:Zn at9.2(1) and 14.1(2) GPa. In Raman spectroscopy can observed the begin phase transition pressure of InP:Fe and InP:Zn is the same at 8.8(1) GPa, but the transition to metallic phase pressure of InP:Fe is at 11.6(2) GPa which is lower than InP:Zn at 14.5(2) GPa, the result is because of the different doping mechanism and dopping element. The doping mechanism of InP:Fe is that the iron forming trivalent ions and replace the indium to form ionic bonds with phosphorous. The doping mechanism of InP:Zn is that the zinc forming ionic bonds with vacancy of phosphorous.