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Title: Improved performance in GaInNAs solar cells by hydrogen passivation

The effect of UV-activated hydrogenation on the performance of GaInNAs solar cells is presented. A proof-of-principle investigation was performed on non-optimum GaInNAs cells, which allowed a clearer investigation of the role of passivation on the intrinsic nitrogen-related defects in these materials. Upon optimized hydrogenation of GaInNAs, a significant reduction in the presence of defect and impurity based luminescence is observed as compared to that of unpassivated reference material. This improvement in the optical properties is directly transferred to an improved performance in solar cell operation, with a more than two-fold improvement in the external quantum efficiency and short circuit current density upon hydrogenation. Temperature dependent photovoltaic measurements indicate a strong contribution of carrier localization and detrapping processes, with non-radiative processes dominating in the reference materials, and evidence for additional strong radiative losses in the hydrogenated solar cells.
Authors:
; ; ; ;  [1] ; ;  [2] ; ;  [3]
  1. Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, 440 W. Brooks St., Norman, Oklahoma 73019 (United States)
  2. Amethyst Research Inc., 123 Case Circle, Ardmore, Oklahoma 73401 (United States)
  3. CRHEA-CNRS, Rue Bernard Gregory, Valbonne 06560 (France)
Publication Date:
OSTI Identifier:
22398842
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 14; Other Information: (c) 2015 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; CHARGE CARRIERS; COMPARATIVE EVALUATIONS; CURRENT DENSITY; GALLIUM ARSENIDES; HYDROGENATION; INDIUM NITRIDES; LUMINESCENCE; NITROGEN; OPTICAL PROPERTIES; PASSIVATION; PERFORMANCE; PHOTOVOLTAIC EFFECT; QUANTUM EFFICIENCY; SOLAR CELLS; TEMPERATURE DEPENDENCE; ULTRAVIOLET RADIATION