A fast and sensitive method for measurement of spectral dependence of the optical absorption coefficient aðEÞ in thin films of photosensitive materials is introduced. A Fourier transform infrared (FTIR) spectrometer is used with a photoconductive sample as an external detector. Experimental conditions and procedures to obtain aðEÞ from normalized FTIR signal are described and results are compar...

Microcrystalline silicon germanium films showing excellent opto-electronic properties have been prepared at a substrate temperature of 1951C by radio frequency plasma enhanced chemical vapor deposition at 13.56MHz. A white light (AM 1.5) photoconductivity of 5 10 /O cm and ambipolar diffusion length of 114 nm (from SSPG) established the device quality. Films are intrinsic (Fermi level near midg...

Ragweed pollinosis is well documented in both the United States and Europe with 26.2% of an American sample population shown to give positive skin prick test reactions to short Ragweed pollen [1]. The clinical manifestations of this sensitisation can be commonly shown as rhinitis, rhinoconjunctivitis and in severe cases allergic asthma. The benefits of specific immunotherapy for the treatment o...

The ambipolar diffusion length and the minority-carrier mobility-lifetime products of microcrystalline hydrogenated germanium thin films, prepared by plasma enhanced chemical vapour deposition, are investigated by using the steady-state photocarrier technique. Different thin film samples were deposited with the dilution of the process gases, germane in hydrogen, GC = [GeH4]/[H2], between 0.2% t...