Materials Literature
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A kind of V-shape-meander-line reconfigurable electromagnetic band-gap (EBG) structure is designed in this paper. The proposed EBG structure is fabricated and measured. It is found that miniaturization and frequency reconfigurability of EBG structure can be realized.
Soft X-ray exposure effects on CH3NH3PbI3perovskite in a patterned device sample with a similar structure to solar cells, a promising candidate for X-ray detectors, have been investigated with an X-ray Photoelectron Spectroscopy (XPS) time-dependent measurement method. Our experimental analyses demonstrate composition…
Novel spatially resolved corona charge-voltage characterization of SiNxARC films on multi-crystalline silicon demonstrates significant grain-to-grain differences in surface voltage and low field dielectric leakage. Kelvin-probe surface voltage line scanning and mapping after corona charging enables visualization of le…
The sequential deposition process is widely used to fabricate planar structure perovskite solar cells because of better uniformity and perfect surface coverage of perovskite films. However, it is difficult to control the crystallization of perovskite finely. Here we improve the sequential deposition process by using a…
We show the optoelectronic quality and the stability of thousands of compositions of hybrid perovskites (including the range of halide substitutions) and methods to re-grow hybrid perovskites to improve their optoelectronic quality. Hyperspectral maps of steady-state absolute intensity photoluminescence (AIPL) are use…
We have developed an all-solid-state two-step process(2SSS) for fabrication of Cu2ZnSnSe4(CZTS) devices. Raman spectra are used to determine and control secondary phases and formation of excess MoSe2at the CZTS/Mo interface due to over selenization. While processing at temperatures above 450 C decreases ZnSe and CuSe…
Photovoltaic cells based on chalcogenides CIGS (Cu(In, Ga)Se2) thin films are a very promising technology. To improve cells performances, a fine optimization of the CIGS absorber properties is needed. Hence, we developed a cross strategy method combining the surface, volume and specific interfaces of the final device…
A novel transmissive phase gradient metasurface (GPGM) is proposed to obtain high efficiency anomalous refraction. The super-cell of GPGM is constructed from six rotated unit cells having high transmission efficiency. The GPGM can provide the desired adverse phase gradients for left- and right-handed circularly polari…
CdS-CdTe Ferroelectric-Semiconductor coupled (FSC) solar cell is a novel concept of photovoltaic device, with ferroelectric nano particles with wurtzite structure (CdS) embedded in light-absorbing semiconductors with zinc blend structure (CdTe). In this work, we found the non-conductive grain boundaries (GBs) as well…
We present a study on the temperature and film depth dependent phase formation in Cu-Zn-Sn-Se thin films. Zn/Sn/Cu precursors were selenized at different temperatures, followed by depth-resolved Raman profiling. A high depth resolution for Raman analysis was achieved by a special sample preparation step using a focuse…
Expressions derived from Poynting's theorem and Monte Carlo techniques report the energy conservation law for a weak formulation of diffraction by lossy 2D random surfaces. To model rigorously light scattering intensities of 2D rough surfaces, from theoretical and numerical reasons, we propose the large-period grating…
Different ultracapacitor models have been proposed in the last decade. These models seek to replicate the real behavior of the ultracapacitor in some applications. But, how fit these models real measures provided by manufacturers? This paper mentionedstandards and methods for ultracapacitor modeling. Afterwards, model…
In this work two isomeric copolymers of benzodithiophene and BODIPY have been designed and synthesized. Structural isomeric polymers were designed such that one of the polymers exhibits more planar architecture, which would help in understanding the effect of structural isomerism and planarity in the polymer backbone…
In spite of the excellent reported efficiencies, perovskite based solar cells are still plagued by concerns related to stability and hysteresis. While the major physical phenomena related to carrier generation and transport are fairly well understood through theoretical models and simulations, the crucial role of inte…
We propose a kind of simple metamaterial (MM), which has capacity to manipulate the orthogonally polarized electromagnetic (EM) waves in the reflection mode. The MM benefits from an uncomplicated design consisting of an inclined rectangular metallic plate closely separated from a ground plane by a dielectric spacer. T…
The operating hypothesis for using nanoparticle precursors to generate thin-film chalcogenide photovoltaics absorbers in Gen 2 PV is that the final crystalline film resulted from thermal treatment would mirror the original nanoprecursors composition. In addition, melting point depression as a result of the nano-confin…
The effect of varying plasma etching process time on alkaline textured mono-crystalline silicon has been investigated and applied for industrial process. Reduced surface reflectance is observed for longer plasma etching process time, with the tradeoff having lower effective carrier lifetime induced by plasma damage. T…
A circular metasurface that consists of twelve gradually increasing two-sided metallic grooves and an ultra-thin flexible dielectric film is theoretically and experimentally demonstrated based on the s poof surface plasmon polaritons (SSPPs) in the microwave frequency. The dispersion characteristics of the SSPPs struc…
A fundamental understanding of the role of vacancies, interstitials, dislocations and grain boundaries on the electronic structure of CdTe may lead to efficiency improvements. Atomistic-level characterization, including microscopy and first principles modeling, is crucial in developing such a fundamental understanding…
Recently, we have proposed a novel approach for fabrication of asymmetric metal-dielectric (hybrid) nanoparticles via combination of standard lithography processes and femtosecond laser reshaping of a metal component of the nanoparticle. Here, we study the influence of the geometrical parameters of the hybrid nanopart…