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Title: Optimization of the optical properties of nanostructured silicon surfaces for solar cell applications

Surface nanostructuration is an important challenge for the optimization of light trapping in solar cell. We present simulations on both the optical properties and the efficiency of micro pillars—MPs—or nanocones—NCs—silicon based solar cells together with measurements on their associated optical absorption. We address the simulation using the Finite Difference Time Domain method, well-adapted to deal with a periodic set of nanostructures. We study the effect of the period, the bottom diameter, the top diameter, and the height of the MPs or NCs on the efficiency, assuming that one absorbed photon induces one exciton. This allows us to give a kind of abacus involving all the geometrical parameters of the nanostructured surface with regard to the efficiency of the associated solar cell. We also show that for a given ratio of the diameter over the period, the best efficiency is obtained for small diameters. For small lengths, MPs are extended to NCs by changing the angle between the bottom surface and the vertical face of the MPs. The best efficiency is obtained for an angle of the order of 70°. Finally, nanostructures have been processed and allow comparing experimental results with simulations. In every case, a good agreement is found.
Authors:
; ; ; ; ;  [1] ;  [2] ;  [3] ;  [4]
  1. Institut d'Electronique et de Microélectronique et de Nanotechnologies, IEMN, (CNRS, UMR 8520), Groupe de Physique, Cité scientifique, avenue Poincaré, 59652 Villeneuve d'Ascq (France)
  2. PHLAM, UMR8523, Université de Lille 1, 59652 Villeneuve d'Asq Cedex (France)
  3. Key Laboratory of Advanced Display and System Application, Shanghai University, 149 Yanchang Road, Shanghai 200072 (China)
  4. Institut d'Electronique et de Microélectronique et de Nanotechnologies, IEMN, (CNRS, UMR 8520), Groupe NAM6, Cité scientifique, avenue Poincaré, 59652 Villeneuve d'Asq (France)
Publication Date:
OSTI Identifier:
22273702
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 13; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; 30 DIRECT ENERGY CONVERSION; ABSORPTION; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; EFFICIENCY; NANOSTRUCTURES; OPTICAL PROPERTIES; OPTIMIZATION; PHOTONS; SILICON; SOLAR CELLS; SURFACES; VISIBLE RADIATION