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Published January 1, 2012 | Version v1
Journal article Open

On the stability of a variety of organic photovoltaic devices by IPCE and in situ IPCE analyses - the ISOS-3 inter-laboratory collaboration

Creators

  • 1. ETSE, Lab Nanostruct Mat Photovolta Energy, Ctr Invest Nanociencia & Nanotecnol CIN2, CSIC, E-08193 Barcelona, Spain
  • 2. Tech Univ Dresden, Arbeitsgrp Organ Solarzellen OSOL, Inst Angew Photophys, D-01062 Dresden, Germany
  • 3. Tech Univ Denmark, Dept Energy Convers & Storage, DK-4000 Roskilde, Denmark
  • 4. Natl Renewable Energy Lab, Golden, CO 80401 USA
  • 5. Holst Ctr, NL-5656 AE Eindhoven, Netherlands
  • 6. Fraunhofer Inst Solar Energy Syst ISE, D-79110 Freiburg, Germany
  • 7. Hasselt Univ, WET OBPC, B-3590 Diepenbeek, Belgium
  • 8. Campus Univ Hasselt, IMOMEC Associated Lab, IMEC, B-3590 Diepenbeek, Belgium
  • 9. Ilmenau Univ Technol, Inst Phys, D-98693 Ilmenau, Germany

Description

This work is part of the inter-laboratory collaboration to study the stability of seven distinct sets of state-of-the-art organic photovoltaic (OPV) devices prepared by leading research laboratories. All devices have been shipped to and degraded at RISempty set-DTU up to 1830 hours in accordance with established ISOS-3 protocols under defined illumination conditions. In this work, we apply the Incident Photon-to-Electron Conversion Efficiency (IPCE) and the in situ IPCE techniques to determine the relation between solar cell performance and solar cell stability. Different ageing conditions were considered: accelerated full sun simulation, low level indoor fluorescent lighting and dark storage. The devices were also monitored under conditions of ambient and inert (N-2) atmospheres, which allows for the identification of the solar cell materials more susceptible to degradation by ambient air (oxygen and moisture). The different OPVs configurations permitted the study of the intrinsic stability of the devices depending on: two different ITO-replacement alternatives, two different hole extraction layers (PEDOT:PSS and MoO3), and two different P3HT-based polymers. The response of un-encapsulated devices to ambient atmosphere offered insight into the importance of moisture in solar cell performance. Our results demonstrate that the IPCE and the in situ IPCE techniques are valuable analytical methods to understand device degradation and solar cell lifetime.

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