Materials Literature
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The friction stir process (FSP) is a solid state process, which has been used to insert reinforcing particles into the structure of a material to create a composite with improved properties. Magnesium is a light structural metal that is increasingly used in the aerospace and automobile industries. In this research, Si…
The research about synthesis of Soft Soap Containing polyhydroxy from Cocoa seed Oil, beginning with the manufacture of the polyhydroxy compound wherein the polyhydroxy compound is obtained through a process of epoxidation and hydroxylation by reacting oils cocoa beans with peroxide acetic acids (peroxy acetate was ob…
A graphene absorber is proposed using frequency selective surface (FSS) and resistive graphene strips on a grounded dielectric slab. The FSS unit is based on two concentric Minkowski loops. The simple circuit model indicates that the combination of loops with different substrate thicknesses can be utilized to realize…
Abstract We associate a semigroup B(S) to every semiring S with semilattice additive reduct, namely the semigroup of all k-bi-ideals of S; and such semirings S have been characterized by this associated semigroup B(S). A semiring S is k-regular if and only if B(S) is a regular semigroup. For the left k-Clifford semiri…
The most important result of a quantum chemical calculation is the total energy of the molecular system. However, being a single number, it provides little immediate chemical information. Energy decomposition schemes provide additional chemical information by decomposing the total energy of a molecular system into the…
Perovskite and crystalline silicon (c-Si) with complementary absorption spectra are connected in a 4-terminal-tandem configuration for efficient utilization of the photons from the complete solar spectrum. A highly transparent electrode with low resistivity is developed by the deposition of molybdenum trioxide (MoO3)/…
CdTe/MgxCd1-xTe double heterostructures (DHs) grown on InSb (001) substrates using molecular beam epitaxy have demonstrated very long carrier lifetime and low interface recombination velocity (IRV) due to the effective carrier confinement and surface passivation provided by MgxCd1-xTe. However, both thermionic emissio…
Thin CuGa/In films with varied compositions were deposited by co-evaporation and then selenized in situ with evaporated selenium. The selenized Cu(In, Ga)Se2absorbers were used to fabricate 390 solar cells. Cu/(Ga+In) and Ga/(Ga+In) (Cu/III and Ga/III) were independently varied, and photovoltaic performance was optima…
In this paper we report a spiking-resistant all-Al rear junction n-type monocrystalline Si solar cell with an efficiency of 18%. This 1×1 inch2cell is fabricated by ionic liquid based electroplating of Al as the front electrode on an n-type Si solar cell with screen-printed Al as the rear junction. Partially-processed…
BaSi2is a new candidate for the absorber in earth-abundant thin-film solar cells. In this study, we found that carrier density in evaporated BaSi2films can be controlled by deposition rate. First, it is shown that BaSi2films are formed at a high average deposition rate up to 2.8×103nm/min at 600 and 650 °C. Then, by H…
Two processes for chloroaluminum phthalocyanine (ClAlPc) synthesis using phthalonitrile and phthalic anhydride are compared based on ClAlPc purity, cost analysis of reactants, and performance for low-cost organic photovoltaic applications. Purity of ClAlPc is characterized through UV-vis and HPLC-mass spectrometry. Th…
The nonlinear interaction of nonsymmetric electromagnetic waves guided by infinitely extended anisotropic cylinder surrounded by a uniform dielectric medium is considered. The parametric instability of the electromagnetic guided waves propagating in the opposite directions is analyzed in the case of the cylinder fille…
We conduct two dimensional TCAD simulation for EBIC imaging and solar cell performance for CdTe solar cells with positively charged grain boundaries. Large signal enhancement is found near grain boundaries for EBIC simulation, but, in contrast to previous claims, cell performance drops when positively charged grain bo…
An InAlAsSb random alloy grown by molecular beam epitaxy (MBE) to be lattice-matched to InP with an intended bandgap of 1.57 eV, has been analyzed using atom probe tomography (APT). The InAlAsSb material has demonstrated optoelectronic properties that deviate from theoretically predicted values, potentially due to the…
One of the main problems of renewable energies is storage of the energy carrier. For long-term storage, solar fuels seem to be a good option. Direct solar water splitting could play an important role in the production of these solar fuels. One of the main challenges of this process is the charge separation and collect…
Solution-processed core/multi-shell semiconductor quantum dots (QDs) could be tailored to facilitate the carrier separation and recombination mechanisms necessary to implement photon upconversion. We have synthesized CdTe cores capped with CdS and then CdSe shells. We present steady-state and time-resolved photolumine…
Organic-inorganic hybrid perovskite solar cells (PSCs) have demonstrated enormous potential to replace the traditional silicon photovoltaics. In spite of impressive progress, an in-depth understanding of various physiochemical and electronic properties of PSCs are yet to be unravelled. Anomalous hysteresis is one amon…
Hybrid buffer layers configurations are investigated for their application in Cu2ZnSnSe4based solar cells. For this purpose, In2S3/CdS, ZnS/CdS, CdS/In2S3and CdS/ZnS were deposited by chemical bath deposition and fully characterized. Additionally, the impact of CdS grown with different precursors (CdSO4and Cd(NO3)2) w…
We report the enhancement of photoluminescence quantum yield (PLQY) by sub-bandgap absorption and emission (for materials with PLQY below the radiative limit) as well as the complications that arise from using radiative efficiency to evaluate potential solar cell performance. When ideal step absorptivity is used to an…
Alternative materials are of interest for the fabrication of thin film solar cells since they could offer potential enhancements for high efficiency devices. Cd1-xZnxS is such a material. In this preliminary study, structural and optical properties of films deposited by chemical bath deposition (CBD) for the two main…