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The role of wide band gap oxide thin layer in inverted structure polymer solar cells was investigated by employing oxide films of TiO 2 and Nb 2 O 5 approximately 10 nm in thickness deposited onto FTO substrates. The experimental results demonstrated that the thin oxide layer serving to separate the electron collecting electrode and the photoactive film of a blend of poly(3-hexylthiophene) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM) was necessary to promote the formation ofdoi:10.4236/msa.2011.212226 fatcat:vzqori672zganabryqyxrlevou