Abstract
Inverted organic photovoltaic cells (IOPVCs), based on the planar heterojunction C60 /CuPc, were grown using MoO3 as anode buffer layer and CsI or Cs2 CO3 as cathode buffer layer (CBL), the cathode being an ITO coated glass. Work functions, Φ f , of treated cathode were estimated using the cyclic voltammetry method. It is shown that Φ f of ITO covered with a Cs compounds is decreased. This decrease is amplified by the annealing. It is shown that the thermal deposition under vacuum of the CBL induces a partial decomposition of the caesium compounds. In parallel, the formation of a compound with the In of ITO is put in evidence. This reaction is amplified by annealing, which allows obtaining IOPVCs with improved efficiency. The optimum annealing conditions is 150 °C for 5 min.
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