Materials Literature
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Equivalent conductivity method is presented to analysis the structures involving metasurfaces. In this method, the calculated equivalent conductivity is ascribed to the metasurface and this surface conductivity plays the interface role between two media in electromagnetics equations. The equivalent conductivity of the…
In most conventional motors, secondary current is supplied by magnetization or electric field generated by electric potential or electromagnetic induction. However, there is a possibility that polarization current can be utilized as secondary current. We propose a new motor that utilizes polarization current generated…
The Design of Experiments (DoE) module in JMP statistical software was used to determine the best parameters for Sb-containing CIGS precursors with a fixed selenization step. Solar cells were fabricated and measured for all completed films. The most important factor influencing the current-voltage device parameters wa…
Oxygenated cadmium sulfide (CdS:O) is an alternative CdTe window layer that delivers improved blue response relative to CdS. Our recent study revealed that CdS: O completely transforms during device fabrication into a layer containing cadmium sulfate clusters interspersed among CdS1-yTeynanocrystals. This motivated us…
High quality rear surface passivation is a prerequisite to obtain high conversion efficiency on thin wafers. SiOxNywith low absorbance and variable refractive index inherits the properties of both SiNxand SiO2which act as a rear surface reflector. SiOxNylayer with low refractive indices ranging from 1.51 to 1.61 was d…
In the present work, we show that controlling structural and chemical parameters is possible to modify the optoelectrical properties of hydrogenated Polymorphous Silicon thin films (pm-Si:H), grown by Plasma Enhanced Chemical Vapor Deposition (PECVD). From the Raman analysis, we observe that the nanocrystalline phase…
Solid solutions of CuInSe2-ZnSe have recently shown promising potential as a photovoltaic material. In this work we investigate the CuInSe2-ZnSe and CuGaSe2-ZnSe systems for high Vocphotovoltaic applications. It was found that the highest Voc(~740 mV) was achieved when the In/(In+Ga) ratio in the precursor was 0.13, i…
Metasurfaces are artificial electromagnetic boundaries usually implemented as two-dimensional periodic arrays of engineered inclusions with sub-wavelength periodicity, which may serve as useful tools to control characteristics of electromagnetic fields. Recently the authors have proposed employing a class of frequency…
New low-temperature processing schemes for controlling of perovskite film in the typical one-step and two-step approaches will be discussed in this work. For one-step method, we propose the scheme of vacuum assisted low-temperature annealing process to control the composition and morphology of triiodide (CH3NH3PbI3) f…
Cu2ZnSn(S, Se)4(CZTSe) is an earth-abundant semiconductor with potential for economical thin-film photovoltaic devices. Short minority carrier lifetimes contribute to low open circuit voltage and efficiency. Deep level defects that may contribute to lower minority carrier lifetimes in kesterites have been theoreticall…
Metasurfaces are artificial two-dimensional structures with subwavelength periodicity. A shape and a size of the unit cells are responsible for electromagnetic properties of a metasurface. Metasurfaces provide specific boundary conditions which define the reflection and transmission properties with respect to incident…
Bifacial solar cell offers the advantage of harvesting the sunlight more effectively and produce extra power from albedo in addition to slightly lower module temperature. Silicon bifacial cells have been studied and commercially produced with doped back surface field (BSF) in conjunction with dielectric passivation. I…
A new D-A structured conjugated polymers PBDTT-TPD and PBDTT-TTPDT based on electron-rich benzo[1,2-b:4,5-b'] dithiophene (BDT) conjugated with alkylthiophene side chains with an electron-deficient 1,3-dibromo-5-(2-octyl)-4H-thieno [3,4-c]pyrrole-4,6(5H)-dione (TPD) and thiophene as a spacer were designed and synthesi…
Styrene functionalized fullerene derivatives have been designed for use as electron-selective contacts in perovskite solar cells. Unlike films of PC61BM and C60fullerene, films of these styrene-functionalized fullerenes (SFFs) can be transformed into a solvent resistant material through thermal curing. Conventional-ge…
IMM solar cell materials often suffer from cracking during a traditional life cycle that includes thermal cycling, shock and vibration, as well as other mechanical stressors. These cracks can limit or destroy the effectiveness of the cell by breaking electrical connections to certain areas of the cell. This work inves…
In this paper we propose growing a ZnO/ZnTe nanowire hetrostructures using a nanowire template via the electrodeposition method. In order to be able to achieve the above, cyclic voltammetry was performed on depositing ZnO and ZnTe on Indium-Tin-Oxide (ITO) covered glass. The pH, current and temperature were monitored…
Engineering of intensity and direction of radiation from a single quantum emitter by means of structuring of their environment at the nanoscale is the cornerstone of modern nanophotonics. Recently discovered systems exhibiting spin-orbit coupling of light are of particular interest in this context. We have demonstrate…
We show that nominally similar CZTSe films may differ significantly in their microscopic structures that cannot be easily revealed by applying conventional characterization tools, including conventional Raman. CZTSs films prepared by sputtering and co-evaporation are examined in both lateral and depth direction to dem…
Increasing efficiency of well-established and well-studied P3HT:PCBM blend solar cells will make them more attractive for their commercial use. In this work, a molecule from the imidazolin-5-one family, referred to as M1, has been investigated for its use with P3HT:PCBM to build ternary active layer solar cell devices…
A vacuum deposition process is developed to fabricate high efficiency perovskite solar cells with high stability using alternating layer-by-layer vacuum deposition. The power conversion efficiencies for the planer device is as high as 19.4% on rigid glass substrate and 15.1% using flexible polymeric substrate, both ar…