Facile synthesis of CuInGaS₂ quantum dot nanoparticles for bilayer-sensitized solar cells.

CuIn(0.7)Ga(0.3)S2 quantum dots (QDs) with particle size of 2-5 nm were directly synthesised by a vacuum one-pot-nanocasting process and homogeneously anchored on TiO2 nanocrystals (<50 nm) for the first time. We further present CuIn(0.7)Ga(0.3)S2 quantum dots and dye bilayer-sensitized solar cells with a power conversion efficiency 36.3% higher than mono-dye sensitized solar cells.