This paper takes into account a hybrid power system consisting of solar and wind units. Both units are connected to the utility grid. The paper concentrates on the use of multijunction solar cell (MJSC) in order to increase the conversion efficiency. The DC output of solar photovoltaic (PV) system is raised by using boost convertor. MPPT technique is used to maximize the output of solar system....

multijunction solar cell with efficiency >50% Marina S. Leite, Robyn L. Woo, Jeremy N. Munday, William D. Hong, Shoghig Mesropian, Daniel C. Law, and Harry A. Atwater J. Thomas Watson Department of Applied Physics, California Institute of Technology, 1200 E California Blvd., Pasadena, California 91125-9500, USA Center for Nanoscale Science and Technology, National Institute of Standards and Tec...

A photoelectric conversion efficiency of over 10% has been achieved in thin-film polycrystalline silicon solar cells which consists of a 2 μm thick layer of polycrystalline silicon with a very small grain size (microcrystalline silicon) formed by low-temperature plasma CVD. This has shown that if the recombination velocity at grain boundaries can be made very small, then it is not necessarily i...

Bismuth triiodide is a lead-free direct wide-bandgap solution-processable semiconductor that could be an alternative to lead-based perovskites in tandem or multijunction solar cells. However, the power conversion efficiency of single-junction BiI3 cells remains low. Here, we determine main loss mechanisms both n-i-p and p-i-n architectures. Overall, devices have higher than n-i-p. It found (and...

In this paper we quantify the constraints and opportunities for radial junction nanowire solar cells, compared to single junction and multijunction solar cells, when light trapping is included. Both nanowire and multijunction designs are reliant on a very low level of traps in the junction region, and without this, single junction designs are optimal. If low trap density at the junction can be ...

Here we propose, for the first time, a solar cell characterized by a semiconductor transistor structure (n/p/n or p/n/p) where the base-emitter junction is made of a high-bandgap semiconductor and the collector is made of a low-bandgap semiconductor. We calculate its detailed-balance efficiency limit and prove that it is the same one than that of a double-junction solar cell. The practical impo...

X. Che, Prof. S. R. Forrest Applied Physics Program University of Michigan Ann Arbor , MI 48109 , USA E-mail: [email protected] X. Xiao, Dr. J. D. Zimmerman, D. Fan, Prof. S. R. Forrest Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor , MI 48109 , USA Prof. S. R. Forrest Departments of Physics and Department of Materials Science and Engineering Univers...

Graphene has been used to synthesize graphene quantum dots (GQDs) via pulsed laser ablation. By depositing the synthesized GQDs on the surface of InGaP/InGaAs/Ge triple-junction solar cells, the short-circuit current, fill factor, and conversion efficiency were enhanced remarkably. As the GQD concentration is increased, the conversion efficiency in the solar cell increases accordingly. A conver...