Artículos de revistas
Band Tails And Defect Density In P-type Doped Hydrogenated Amorphous Germanium
Registro en:
Journal Of Non-crystalline Solids. , v. 198-200, n. PART 1, p. 399 - 402, 1996.
223093
10.1016/0022-3093(95)00743-1
2-s2.0-0030563278
Autor
Comedi D.
Fajardo F.
Chambouleyron I.
Institución
Resumen
The correlations between the defect density, N D, Fermi energy, E F, and Urbach tail, E 0, are examined for rf-sputtered a-Ge:H films p-type doped by aluminum, gallium and indium. Photothermal deflection spectroscopy was used for the determination of N D and E 0, while E F was deduced from conductivity measurements. The present data show different dependence of N D on E F for samples doped by different dopants, but a similar behavior when N D is plotted as a function of E 0 or the solid-state dopant impurity concentration. The simple equilibrium model of doping alone is unable to explain the present results. The data suggest that the doping-induced defects observed are related to the large fraction of neutral dopant impurities expected to be present in the material. 198-200 PART 1 399 402 Street, R.A., (1982) Phys. Rev. Lett., 49, p. 1187 Winer, K., (1990) Phys. Rev., B41, p. 12150 Pierz, K., Fuhs, W., Mell, H., (1991) Philos. Mag., B63, p. 123 Ebersberger, B., Krühler, W., Fuhs, W., Mell, H., (1994) Appl. Phys. Lett., 65, p. 1683 Comedi, D., Fajardo, F., Chambouleyron, I., (1995) Phys. Rev., B52, p. 4974 Fajardo, F., Chambouleyron, I., (1995) Phys. Rev., B52, p. 4965 Graeff, C.F.O., Stutzmann, M., Eberhardt, K., (1994) Philos. Mag., B69, p. 387 Comedi, D., Fajardo, F., Chambouleyron, I., Tabacniks, M., (1994) J. Vac. Sci. Technol., A12, p. 3149 Stutzmann, M., (1989) Philos Mag., B60, p. 531 Aljishi, S., Shu, J., Ley, L., (1989) Mater. Res. Soc. Symp. Proc., 149, p. 125