水热法可控合成二氧化钛纳米晶及其在染料敏化太阳能电池中的应用

Abstract

A simple method for the controllable hydrothermal synthesis of nanocrystalline anatase TiO 2 (nc-TiO 2) particles involving the selection of suitable organic alkali peptizing agents is reported. A dye-sensitized solar cell (DSSC) with square-like nc-TiO 2 particles with side lengths about 8-13 nm-prepared using tetraethylammonium hydroxide (TEAOH)-in the photoelectrode showed higher photovoltaic performance than two other DSSCs with square-like nc-TiO 2 particles with side lengths about 7-10 nm-prepared using tetrabutylammonium hydroxide-or elongated nc-TiO 2 particles with lengths about 18-35 nm and width about 1018 nm-prepared using tetramethylammonium hydroxide (TMAOH)-in the photoelectrodes. When a scattering layer prepared from sub-micron size spheres or cone-like nc-TiO 2 particles-synthesized using a higher concentration of TMAOH-was added on top of the the photoelectrode fabricated from nc-TiO 2 synthesized with TEAOH, the energy conversion efficiency of the DSSC was markedly increased from 6.77% to 8.18%.