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Phase separation-driven stratification in conventional and inverted P3HT:PCBM organic solar cells

Abstract : We have used neutron reflectivity to investigate the stratification of poly(3-hexylthiophene) (P3HT) and phenyl-C-61-butyric acid methyl ester (PCBM) blend films. Films were spun-cast on poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) and titanium oxide (TiOx) layers to mimic the procedures followed for the fabrication of conventional and inverted organic photovoltaics respectively. The resultant scattering length density profiles reveal a PCBM-rich layer is formed in the vicinity of PEDOT: PSS or TiOx, while PCBM is depleted at the free surface of the film. PCBM segregation close to the substrate is further enhanced by annealing. This stratification is considered to be favorable only for inverted devices. (C) 2013 Elsevier B. V. All rights reserved.
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Submitted on : Thursday, January 9, 2014 - 1:43:25 PM
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Eleni Pavlopoulou, Guillaume Fleury, Dargie Hailu Deribew, Fabrice Cousin, Mark Geoghegan, et al.. Phase separation-driven stratification in conventional and inverted P3HT:PCBM organic solar cells. Organic Electronics, Elsevier, 2013, 14 (5), pp.1249-1254. ⟨10.1016/j.orgel.2013.02.020⟩. ⟨hal-00926295⟩

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