Efficient CdPbS Quantum Dots-Sensitized TiO2 Photoelectrodes for Solar Cell Applications
Abstract:CdPbS quantum dots-sensitized TiO2 photoelectrode was prepared using chemical bath codeposition technique by dipping TiO2 film into a 0.5 M Cd(NO3)2–Pb(NO3)2 solution (molar ratio 9:1) and a 0.5 M Na2S methanol solution. The CdPbS quantum dots have the size about 4 to 6 nm and distribute homogeneously in the TiO2 film. The as-prepared electrode showed improved absorption spectra. The assembled quantum dots-sensitized solar cell (QDSSC) yielded a power conversion efficiency (η) of 1.88% and a short-circuit current of 15.28 mA/cm2 under AM 1.5 illumination of 100 mW/cm2, far outperformed the single PbS, CdS QDSSC and the η increased 49.2% than coupled PbS/CdS QDSSC. The solar cell presented IPCE peak value of 45.7% and the effective photovoltaic range covers the visible region and near infrared region.
Document Type: Research Article
Publication date: November 1, 2011
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