Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 95, Issue 4, Pages 1123-1130Publisher
ELSEVIER
DOI: 10.1016/j.solmat.2010.12.030
Keywords
Organic solar cells; Stability; TiOx; P3HT/PCBM
Funding
- nanoSTAR, the Institute for Nanoscale and Quantum Scientific and Technological Advanced Research at the University of Virginia
- Department of Energy (DOE)
- US Army: CERDC [LLC/GTS-S-09-1-196]
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We describe a study of the stabilization behavior of P3HT/PCBM organic solar cells under air and UV irradiation using a 20 nm thin TiOx protection layer made by partial hydrolysis of a Ti-alkoxide and spin coating in air. Data on the degradation of solar cell performance under air and under UV exposure are presented indicating that significant improvements are observed with TiOx layer protection. The protection mechanism has been investigated by transmission IR and UV spectroscopy and by ESR spectroscopy. The results of this study suggest how sal-gel derived TiOx films containing organic functionalities serve as effective passivation films for protection from oxygen when excited by photons, where the photooxidation of the bound organic moieties causes oxygen gas scavenging. (C) 2010 Elsevier B.V. All rights reserved.
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