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Title: Theoretical performance of solar cell based on mini-bands quantum dots

The tremendous amount of research in solar energy is directed toward intermediate band solar cell for its advantages compared with the conventional solar cell. The latter has lower efficiency because the photons have lower energy than the bandgap energy and cannot excite mobile carriers from the valence band to the conduction band. On the other hand, if mini intermediate band is introduced between the valence and conduction bands, then the smaller energy photons can be used to promote charge carriers transfer to the conduction band and thereby the total current increases while maintaining a large open circuit voltage. In this article, the influence of the new band on the power conversion efficiency for structure of quantum dots intermediate band solar cell is theoretically investigated and studied. The time-independent Schrödinger equation is used to determine the optimum width and location of the intermediate band. Accordingly, achievement of a maximum efficiency by changing the width of quantum dots and barrier distances is studied. Theoretical determination of the power conversion efficiency under the two different ranges of QD width is presented. From the obtained results, the maximum power conversion efficiency is about 70.42%. It is carried out for simple cubic quantum dot crystalmore » under fully concentrated light. It is strongly dependent on the width of quantum dots and barrier distances.« less
Authors:
 [1] ;  [2] ;  [3] ;  [2]
  1. Power Electronics and Energy Conversion Department, ERI, NRCB (Egypt)
  2. (Saudi Arabia)
  3. Radiation Engineering Department, NCRRT, Atomic Energy Authority (Egypt)
Publication Date:
OSTI Identifier:
22271205
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 77 NANOSCIENCE AND NANOTECHNOLOGY; CHARGE CARRIERS; COMPARATIVE EVALUATIONS; CRYSTALS; ELECTRIC CURRENTS; ELECTRONIC STRUCTURE; ENERGY CONVERSION; ENERGY EFFICIENCY; ENERGY GAP; PHOTONS; QUANTUM DOTS; SOLAR CELLS; SOLAR ENERGY; VALENCE