Defect Equilibration and Intrinsic Stress in Undoped Hydrogenated Amorphous Silicon

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概要

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• Relaxation data for the thermal equilibritum defect densities in undoped a-Si:H are obtained by time-of-flight (TOF) measurement in the temperature range of 160° to 250℃. The internal stress in the material is also measured. The mobility-lifetime product of electrons (μт) increases from 0.50×10^<-7> to its equilibrium value of 2.24×10^<-7> cm^2/V during the 160℃ annealing. The equilibrium value of μт is equivalent to the spin density (N_s) of 1.12×10^<15> cm^<-3>. The N_s. curves have a minimun value just before their equilibrium. The time dependence of the N_s relaxation follows a two-term stretched exponential form which corresponds to two metastable states, and each relaxation time is activated with activation energies of 1.10 to 1.20 eV. The thermal equilibrium N_s increases with temperature with an activation energy of 0.20 to 0.30 eV. The data for the second annealing at 160℃ after the first long annealings at 200° and 250℃ also follows the two-term stretched exponential form derived from the first annealing data. The result suggests the presence of a multivalley energy configuration diagram at metastable states. The drift mobility of electrons (μ) increases slightly compared with the μт changes, and no stress change is observed during the various annealing steps. It is concluded that the structural change is much smaller than the change in metastable-state densities during annealing in the temperature range of 160° to 250℃.

• 社団法人応用物理学会の論文
• 1994-03-15

著者

• PEREZ-MENDEZ Victor

  Lawrence Berkeley Laboratory

• DREWERY John

  Lawrence Berkeley Laboratory, University of California

• Drewery John

  Lawrence Berkeley Laboratory

• KITSUNO Yu

  Lawrence Berkeley Laboratory

• COO Gyuseong

  Lawrence Berkeley Laboratory

• HONC Wan-Shick

  Lawrence Berkeley Laboratory

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• Theoretical Considerations of a New Electronically Collimated Gamma Camera Utilizing Gas Scintillation
• Defect Equilibration and Intrinsic Stress in Undoped Hydrogenated Amorphous Silicon

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