Figure 5From: Enhanced efficiency of inverted polymer solar cells by using solution-processed TiOx/CsOx cathode buffer layer Droplet images of P3HT:ICBA solution. Droplet images of P3HT:ICBA solution on the surface of FTO substrate (a), CsOx (b), TiOx (c), and TiOx/CsOx (d), respectively. The length of the FTO-coated glass substrate is 3.0 cm.Back to article page