Figure 4From: Semitransparent inverted polymer solar cells employing a sol-gel-derived TiO2 electron-selective layer on FTO and MoO3/Ag/MoO3 transparent electrodeTransmittance spectra of ITO and FTO substrates after annealing treatment at 20°C and 500°C. The hollow star line is the absorption spectra of P3HT:PCBM active layer.Back to article page