Boron and sulfur co-doped TiO_2 nanofilm as effective photoanode for high efficiency CdS quantum-dot-sensitized solar cells

摘要

A modified polysulfide redox couple, (CH_3)_4N)_2S/((CH_3)_4N)_2S_n, was employed in CdS quantum dots (QDs) sensitized B/S co-doped TiO_2 solar cell with NiS as counter electrode, followed by chemical bath deposition (CBD) in an organic solution to prepare the QPs-cell to ensure high wettability and superior penetration ability of the B/S co-doped TiO_2 films, with the co-doping of B/S in TiO_2, its band-gap was narrowed and significantly extended the light capture range, and an enhanced energy conversion efficiency of up to 3.6% was observed under AM 1.5 G illuminations, with a significantly high V_(oc) of 1.217 V, a high ff of 88.2% and a short-circuit photocurrent (J_(sc)) of 3.35 mA cm~(-2).