A detailed study of the implantation-induced damage in Si on sapphire, carried out by optical-absorption measurements extending from energies above the band gap down to energies far into the subgap region of Si, is presented. The changes induced in the optical band gap, band-edge slopes, and in the subgap features of the spectra are carefully described. The various stages of formation and quenching of divacancies were monitored as a function of implantation conditions and annealing cycles through their 1.8-m absorption band. It is shown that the divacancies strongly affect the population of band-tail states and the annealing studies revealed that the progressive quenching of the divacancy band is followed by the appearance of another absorption band, characteristic of some intrinsic secondary defect, whose annealing behavior is similar to the one observed for the five-vacancy electron-paramagnetic-resonance spectrum. The study of the structural relaxation process in implanted a-Si gave indications that the process is indeed associated with annihilation of defects as well as average strain reduction in the material, in agreement with earlier indications. Finally, some common features, such as band-edge inverse-logarithmic slope values and subgap features, are found in annealed implanted crystalline and a-Si. © 1994 The American Physical Society.

Zammit, U., Madhusoodanan, K., Marinelli, M., Scudieri, F., Pizzoferrato, R., Mercuri, F., et al. (1994). Optical-absorption studies of ion-implantation damage in Si on sapphire. PHYSICAL REVIEW. B, CONDENSED MATTER, 49(20), 14322-14330 [10.1103/PhysRevB.49.14322].

Optical-absorption studies of ion-implantation damage in Si on sapphire

ZAMMIT, UGO;MARINELLI, MASSIMO;SCUDIERI, FOLCO;PIZZOFERRATO, ROBERTO;MERCURI, FULVIO;
1994

Abstract

A detailed study of the implantation-induced damage in Si on sapphire, carried out by optical-absorption measurements extending from energies above the band gap down to energies far into the subgap region of Si, is presented. The changes induced in the optical band gap, band-edge slopes, and in the subgap features of the spectra are carefully described. The various stages of formation and quenching of divacancies were monitored as a function of implantation conditions and annealing cycles through their 1.8-m absorption band. It is shown that the divacancies strongly affect the population of band-tail states and the annealing studies revealed that the progressive quenching of the divacancy band is followed by the appearance of another absorption band, characteristic of some intrinsic secondary defect, whose annealing behavior is similar to the one observed for the five-vacancy electron-paramagnetic-resonance spectrum. The study of the structural relaxation process in implanted a-Si gave indications that the process is indeed associated with annihilation of defects as well as average strain reduction in the material, in agreement with earlier indications. Finally, some common features, such as band-edge inverse-logarithmic slope values and subgap features, are found in annealed implanted crystalline and a-Si. © 1994 The American Physical Society.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/01 - Fisica Sperimentale
Settore FIS/03 - Fisica della Materia
English
Condensed Matter Physics
Zammit, U., Madhusoodanan, K., Marinelli, M., Scudieri, F., Pizzoferrato, R., Mercuri, F., et al. (1994). Optical-absorption studies of ion-implantation damage in Si on sapphire. PHYSICAL REVIEW. B, CONDENSED MATTER, 49(20), 14322-14330 [10.1103/PhysRevB.49.14322].
Zammit, U; Madhusoodanan, K; Marinelli, M; Scudieri, F; Pizzoferrato, R; Mercuri, F; Wendler, E; Wesch, W
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/130913
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