Prof. Juan Luis Delgado from the Hybrid Materials for Photovoltaics Group in POLYMAT is the guest editor together with Prof. Vladimir Dyakonov, Scientific Director of the Bavarian Centre of Applied Energy Research (ZAE Bayern) in Germany. 

This issue has been dedicated to Prof. Nazario Martín, Prof. at Universidad Complutense de Madrid, on the ocassion of his 60th anniversary.