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Title: Enhanced regeneration of degraded polymer solar cells by thermal annealing

The degradation and thermal regeneration of poly(3-hexylethiophene) (P3HT):[6,6]-phenyl-C{sub 61}-butyric acid methyl ester (PCBM) and P3HT:indene-C{sub 60} bisadduct (ICBA) polymer solar cells, with Ca/Al and Ca/Ag cathodes and indium tin oxide/poly(ethylene-dioxythiophene):polystyrene sulfonate anode have been investigated. Degradation occurs via a combination of three primary pathways: (1) cathodic oxidation, (2) active layer phase segregation, and (3) anodic diffusion. Fully degraded devices were subjected to thermal annealing under inert atmosphere. Degraded solar cells possessing Ca/Ag electrodes were observed to regenerate their performance, whereas solar cells having Ca/Al electrodes exhibited no significant regeneration of device characteristics after thermal annealing. Moreover, the solar cells with a P3HT:ICBA active layer exhibited enhanced regeneration compared to P3HT:PCBM active layer devices as a result of reduced changes to the active layer morphology. Devices combining a Ca/Ag cathode and P3HT:ICBA active layer demonstrated ∼50% performance restoration over several degradation/regeneration cycles.
Authors:
 [1] ;  [2] ; ; ; ;  [3] ;  [3] ;  [2]
  1. CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi 110012 (India)
  2. (Australia)
  3. Centre for Organic Electronics, Physics, University of Newcastle, Callaghan NSW-2308 (Australia)
Publication Date:
OSTI Identifier:
22280367
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 19; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM; BUTYRIC ACID; CALCIUM; CATHODES; ETHYLENE; FULLERENES; INDENE; INDIUM; POLYSTYRENE; SEGREGATION; SOLAR CELLS; TIN OXIDES