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Photon upconversion of near-infrared photons is a promising way to overcome the Shockley–Queisser efficiency limit of 32% of a single-junction solar cell. However, the practical applicability of the most efficient known upconversion materials at moderate light intensities is limited by their extremely weak and narrowband near-infrared absorption. Here, we(More)
A systematic investigation of the influence of the process parameters temperature, pressure, total gas flow, and SiH 2 Cl 2 :NH 3 gas flow ratio on the residual stress, the refractive index, and its nonuniformity across a wafer, the growth rate, the film thickness nonuniformity across a wafer, and the Si/N incorporation ratio of low pressure chemical vapor(More)
The synthesis of green methanol from hydrogen and carbon dioxide can contribute to mitigation of greenhouse gasses. This methanol can be utilized as either a transport fuel or as an energy carrier for electricity storage. It is preferable to use inexpensive, reliable and renewable energy sources to provide the energy needed for the green methanol(More)
In this paper, the electrical and optical properties of undoped and in-situ doped amorphous SiC films are presented. The films are prepared by using mixture of methane (CH 4) and silane (SiH 4) as C and Si sources, phosphine (PH 3) and diborane (B 2 H 6) as doping gases. The bandgap, optical constant and absorption coefficient of the films are measured and(More)
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