Effect of thermal annealing on optical and photoelectric properties of microcrystalline hydrogenated silicon films |
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Authors: | A. G. Kazanskii H. Mell P. A. Forsh |
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Affiliation: | 1. Moscow State University, Moscow, 119899, Russia 2. Fachbereich Physik, Philipps-Universit?t Marburg, D-35032, Marburg, Germany
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Abstract: | The effect of thermal annealing in the temperature range T a=300–600°C of films of microcrystal-line hydrogenated silicon (μc-Si:H) lightly doped with boron on the spectral dependences of the absorption coefficient (α) at photon energies hν=0.8–2.0 eV, dark conductivity (σd), and photoconductivity (Δσph) was studied at room temperature. With increasing annealing temperature, a nonmonotonic variation of α (at hν<1.2 eV), σd, and Δσph was observed. The data obtained are attributed to a change in the concentration of electrically active impurities and formation of defects, caused by hydrogen effusion and bond restructuring at high annealing temperatures. |
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