TY - JOUR
T1 - In situ characterization of microcrystalline silicon by time resolved microwave conductivity
AU - Brenot, R.
AU - Bulkin, P.
AU - Roca I Cabarrocas, P.
AU - Drévillon, B.
AU - Vanderhaghen, R.
PY - 1998/1/1
Y1 - 1998/1/1
N2 - Time resolved microwave conductivity (TRMC) provides the product of the number of free carriers, generated by a laser pulse, by their mobility. A TRMC set-up is implemented in situ together with ultraviolet (UV) visible spectroscopic ellipsometry to analyze and optimize the growth of microcrystalline silicon (μc-Si) by conventional radio frequency discharges. The modelling of TRMC experiment is presented, including numerical simulations of microwave reflectivity, and carrier generation and recombination kinetics. Various materials are analyzed. For the material obtained from SiF4-H2 mixtures, the recombination lifetime varies with the power -0.5 of the carrier density, and the best effective mobility is μeff = 25(±5) cm2 V-1s-1. The set-up allows quantitative comparisons with other materials. For μc-Si films deposited by the integrated distributed electron cyclotron resonance (IDECR) technique, we observe a bimolecular recombination at high laser fluence, followed by a monomolecular one. The effective mobility is μeff = 6(±2) cm2 V-1 s-1.
AB - Time resolved microwave conductivity (TRMC) provides the product of the number of free carriers, generated by a laser pulse, by their mobility. A TRMC set-up is implemented in situ together with ultraviolet (UV) visible spectroscopic ellipsometry to analyze and optimize the growth of microcrystalline silicon (μc-Si) by conventional radio frequency discharges. The modelling of TRMC experiment is presented, including numerical simulations of microwave reflectivity, and carrier generation and recombination kinetics. Various materials are analyzed. For the material obtained from SiF4-H2 mixtures, the recombination lifetime varies with the power -0.5 of the carrier density, and the best effective mobility is μeff = 25(±5) cm2 V-1s-1. The set-up allows quantitative comparisons with other materials. For μc-Si films deposited by the integrated distributed electron cyclotron resonance (IDECR) technique, we observe a bimolecular recombination at high laser fluence, followed by a monomolecular one. The effective mobility is μeff = 6(±2) cm2 V-1 s-1.
KW - Lifetime
KW - Microcrystalline silicon
KW - Mobility
U2 - 10.1016/S0022-3093(98)00320-2
DO - 10.1016/S0022-3093(98)00320-2
M3 - Article
AN - SCOPUS:0032065157
SN - 0022-3093
VL - 227-230
SP - 1001
EP - 1005
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
IS - PART 2
ER -