We have analyzed the temperature and intensity dependence of open-circuit voltage InGaN/GaN multi-quantum well solar cells up to 725 K more than 1000 suns. show that simple ABC model routinely used analyze measured quantum efficiency data LEDs can accurately reproduce if a temperature-dependent Shockley-Read-Hall lifetime is device heating taken into account.

A positive integer N is called an abundant number if σ(N) > 2N, where σ (N) denotes the suns of the divisors of N including 1 and N. Abundant numbers have been recently investigated by Behrend, Chowla, Davenport , myself, and others ; it has been proved, for example, that they have a density greater than 0 . I prove now the following THEOREM. We can find two constants c l , c 2 such that , for ...

Ultra-high concentrator photovoltaics (UHCPV), with concentrations higher than 1000 suns, have been pointed out by different authors as having great potential for being a cost-effective PV technology. This Letter presents a UHCPV Cassegrain-based optical design in which the sunrays are concentrated and sent from four different and independent paraboloid-hyperboloid pairs optical units onto a si...

The concentrator photovoltaic (CPV) system has a high potential in increasing the power output, propelling further concentration ratio generating excessive heat that significantly deteriorates solar cell efficiency and reliability. To thoroughly exploit graphene as pre-illumination cooling technique for cell, we experimentally characterized screen printed coating (GC) physicochemical characteri...

We prove that in a convex metric space (X, d), an existence set K having a lower semi continuous metric projection is a δ-sun and in a complete M -space, a Chebyshev set K with a continuous metric projection is a γ-sun as well as almost convex.