In this paper, the optical absorption coefficient, optical gap and the index of refraction of a-Si:H/a-SiN_x:H superlattice films were studied as a function of a-Si:H sublayer thickness with a-SiN_x:H sublayer thickness being kept constant.
Using the more general expressions of the quantum efficiency, which had been deduced by us, we had analyzed numerically the effects of themultireflex, surface recombination velocities, optical absorption coefficient et al. on the NIP junction Hg_(0.8)Cd_(0.2)Te(77K) infrared photovoltaic devices.
FeS_2 has been considered as a valuable thin film solar cells material since it consists of nontoxic and abundant elements, and it has suitable band gap of about 0.95eV and very high light absorption coefficient (α≥5×10~5cm~(-1),λ≤700nm).
We also demonstrated our experimental system and gave an estimation value of waters light absorption coefficient through the measurement of water volume in a sample paper in the experiment.
The results show that the light absorption coefficient of the a-Si film increased as the temperature of bed plate increased, and decreased as the RF power and gas flowing rate increased. The films with the absorption coefficient no less than 1×10~3 cm~(-1) at the wavelength of about 700 nm were obtained, which meets the technical requirements of a high quality liquid crystal light valve.
FeS_2 has been considered as a valuable thin film solar cells material since it consists of nontoxic and abundant elements, and it has suitable band gap of about 0.95eV and very high light absorption coefficient (α≥5×10~5cm~(-1),λ≤700nm).
The values S range from 0.0131nm -1 to 0.0180nm -1 in Jiaozhou Bay, from 0.0105nm -1 to 0.0137nm -1 in Various Concentrate and algae filtrate without relation to a(λ 0) . The study also show the yellow substance is one of main light absorption substance in sea water on blue and ultraviolet wavebands.
The basic parameters of these materials (such as the refractive index, optical absorption coefficient, density, thermal conductivity, and heat capacity) are determined.
The optical absorption coefficient in the region of a wide charge-transfer band in copper oxide CuO (?ω=3.19 eV) exhibits sharp and anomalously large (up to 8% (!)) changes near two magnetic phase transition temperatures
Data on acoustic (absorption and velocity of sound), optical (refractive index and optical absorption coefficient), and photoelastic (coefficients of acoustooptical quality and photoelastic constants) properties of KY(MoO4)2 crystals are obtained.