InterconnectedTiO2Nanowire Networks for PbS Quantum Dot Solar Cell Applications

[摘要] We present a simple method for the fabrication of an interconnected porousTiO2nanostructured film via dip coating in a colloidal suspension of ultrathinTiO2nanowires followed by high-temperature annealing. The spheroidization of the nanowires and the fusing of the loosely packed nanowire films at the contact points lead to the formation of nanopores. Using this interconnectedTiO2nanowire network for electron transport, a PbS/TiO2heterojunction solar cell with a large short-circuit current of 2.5 mA/cm2, aVocof 0.6 V, and a power conversion efficiency of 5.4% is achieved under 8.5 mW/cm2white light illumination. Compared to conventional planarTiO2film structures, these results suggest superior electron transport properties while still providing the large interfacial area between PbS quantum dots andTiO2required for efficient exciton dissociation.

[学科分类] 材料工程