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Title: Illumination angle and layer thickness influence on the photo current generation in organic solar cells: A combined simulative and experimental study

In most future organic photovoltaic applications, such as fixed roof installations, facade or clothing integration, the solar cells will face the sun under varying angles. By a combined simulative and experimental study, we investigate the mutual interdependencies of the angle of light incidence, the absorber layer thickness and the photon harvesting efficiency within a typical organic photovoltaic device. For thin absorber layers, we find a steady decrease of the effective photocurrent towards increasing angles. For 90-140 nm thick absorber layers, however, we observe an effective photocurrent enhancement, exhibiting a maximum yield at angles of incidence of about 50┬░. Both effects mainly originate from the angle-dependent spatial broadening of the optical interference pattern inside the solar cell and a shift of the absorption maximum away from the metal electrode.
Authors:
; ; ; ;  [1] ;  [1] ;  [2]
  1. Light Technology Institute (LTI), Karlsruhe Institute of Technology (KIT), Engesserstra├če 13, D-76131 Karlsruhe (Germany)
  2. (IMT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen (Germany)
Publication Date:
OSTI Identifier:
22492284
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 5; Journal Issue: 7; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; ABSORPTION; EFFICIENCY; ELECTRODES; ILLUMINANCE; INCIDENCE ANGLE; INTERFERENCE; LAYERS; ORGANIC SOLAR CELLS; PHOTONS; PHOTOVOLTAIC EFFECT; VISIBLE RADIATION; YIELDS