The Atacama Large Millimeter-submillimeter Array (ALMA), sited on the high desert plains of Chajnantor in Chile, has opened a new window onto solar physics 2016 by providing continuum observations at millimeter and sub-millimeter wavelengths with an angular resolution comparable to that available optical (O), ultraviolet (UV), extreme (EUV), X-ray wavelengths, superior time resolution. In inter...

Demand of energy is more sensible now because of population growth and economic growth of countries. In order to increase of energy consumption around the world and environment pollution, attention to the renewable energy such as solar energy is inevitable. Building-integrated photovoltaic (BIPV) electric power systems not only produce electricity, they are also part of the building. For exam...

We propose an approach for enhancing the absorption of thin-film amorphous silicon solar cells using periodic arrangements of resonant dielectric nanospheres deposited as a continuous film on top of a thin planar cell. We numerically demonstrate this enhancement using 3D full field finite difference time domain simulations and 3D finite element device physics simulations of a nanosphere array a...

Solar energy is clean, renewable and its decentralized character is appropriate well at the scattered state of the zones with low density of population. The cost of electricity from the solar array system is more expensive than the electricity from the utility grid. So, it is necessary to operate the PV system at maximum efficiency by tracking maximum power point at any environmental condition....

We report the realization of a prototype solar cell based on a ZnO/ZnSe core/shell nanowire array. The ZnO/ZnSe core/shell nanowire forms a type II heterojunction that can have an effective bandgap much below that of either component. The nanowire array architecture offers strong enhancement in light absorption through increasing the junction area and light trapping. The device shows a photo-re...

Weak absorption of light near the absorption band edge of a photovoltaic material is one limiting factor on the efficiency of photovoltaics. This is particularly true for silicon thin-film solar cells because of the short optical path lengths and limited options for texturing the front and back surfaces. Directing light laterally is one way to increase the optical path length and absorption. We...

REAG has been tasked with predicting the on-orbit radiation induced transient response in the JWST focal plane arrays (FPA) in the context of assessing the impact on acquisition of science data. Since this is a problem of general interest, NEPP also contributed to the analysis. Pre-mission knowledge of the transient response will allow mission planners to optimize the observatory design and per...

This paper presents modeling and simulation of Grid Connected Photovoltaic (PV) system by using improved mathematical model. The model is used to study different parameter variations and effects on the PV array including operating temperature and solar irradiation level. In this paper stepped P&O algorithm is proposed for MPPT control. This algorithm will identify the suitable duty ratio in whi...