1 research outputs found
Cu<sub>2</sub>ZnSnS<sub>4</sub> Nanoparticle Sensitized Metal–Organic Framework Derived Mesoporous TiO<sub>2</sub> as Photoanodes for High-Performance Dye-Sensitized Solar Cells
We
present a facile hot injection and hydrothermal method to synthesize
Cu<sub>2</sub>ZnSnS<sub>4</sub> (CZTS) nanoparticles sensitized metal–organic
frameworks (MOFs)-derived mesoporous TiO<sub>2</sub>. The MOFs-derived
TiO<sub>2</sub> inherits the large specific surface area and abundantly
porous structures of the MOFs structure, which is of great benefit
to effectively enhance the dye loading capacity, prolong the incident
light traveling length by enhancing the multiple interparticle light-scattering
process, and therefore improve the light absorption capacity. The
sensitization of CZTS nanoparticles effectively enlarges the photoresponse
range of TiO<sub>2</sub> to the visible light region and facilitates
photoinduced carrier transport. The formed heterostructure between
CZTS nanoparticles and MOFs-derived TiO<sub>2</sub> with matched band
gap structure effectively suppresses the recombination rates of photogenerated
electron/hole pairs and prolongs the lifespan of the carriers. Photoanodes
based upon CZTS/MOFs-derived TiO<sub>2</sub> photoanodes can achieve
the maximal photocurrent of 17.27 mA cm<sup>–2</sup> and photoelectric
conversion performance of 8.10%, nearly 1.93 and 2.21 times higher
than those of TiO<sub>2</sub>-based photoanode. The related mechanism
and model are investigated. The strikingly improved photoelectric
properties are ascribed to a synergistic action between the MOFs-derived
TiO<sub>2</sub> and the sensitization of CZTS nanoparticles