Chinese Journal of Magnetic Resonance

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EXPERIMENT OBSERVATION OF Ga SELF INTERSTITIAL DEFECT OF  GaP NANOCRYSTALS BY ELECTRON PARAMAGNETIC RESONANCE

ZHANG Zhao-chun, ZOU Lu-jun, CUI De-liang   

  1. School of Materials Science and Technology, Shanghai University, Shanghai 200072, China; Institute of Crystal Materials, Shandong University, Jinan 250100, China
  • Received:2003-03-14 Revised:2003-05-21 Published:2003-12-05 Online:2003-12-05
  • Supported by:

    上海市高等学校科学技术发展基金资助项目(01A23).

Abstract:

The intrinsic point defects of GaP nanocrystals were investigated by electron paramagnetic resonance (EPR). The g value of GaP nanocrystals EPR si
gnal observed was 2.0027±0.0004, suggesting the existence of Ga self-interstitial defect. Collapse of hyperfine splitting and narrowing of peak-to-peak linewidth (ΔHPP) were observed, probably resulting from interface disorders and rapid electron exchange between the defect atoms and the interface atoms. In lower measuring temperature range, increase of temperature led to occurrence of grain boundary relaxation of GaP nanocrystals. The value of both ΔHPP and concentration of dangling bound decrease as the measuring temperature increased from 100 K to 423 K.

Key words: EPR, nanometer, GaP, point defect

CLC Number: