TiO2 doped with different ratios of graphene and optimized application in CdS/CdSe quantum dot-sensitized solar cells

Tuning band alignment by CdS layers using a SILAR method to enhance TiO2/CdS/CdSe quantum-dot solar-cell performance

“…In addition, PCE and all related factors (J sc , V oc , FF) almost remain constant after more than 6 layers of CdS (see Table S4, ESI †). The best performing device has an efficiency of about 6% (5.9-6.3% in different experiments), which is higher than those of other CdS/CdSe sensitized solar cells prepared in the same way [15][16][17][18] and is similar to the latest report (6.01%) in which CdS/ CdSe are co-sensitized on TiO 2 nanowire-coated hollow spheres. 19 The electrochemical impedance spectroscopy (EIS) measurements of the cells (Fig.…”

Graphene Frameworks Promoted Electron Transport in Quantum Dot-Sensitized Solar Cells

“…Therefore, promotion of photogenerated electron transport in the TiO 2 electrode has become one of the most promising methods by which to improve the photovoltaic performance of cells. Incorporation of conductive nanostructured architectures (such as carbon nanotube and graphene) has been reported as an effective approach to promote electron transport in the TiO 2 photoanode. − Among these nanostructures, graphene, a two-dimensional single-layer sheet of sp 2 hybridized carbon atoms with exceptional electronic, thermal, and mechanical properties, is extensively used in sensitized solar cells. − In fabricated TiO 2 /graphene composites, graphene could facilitate electron transport in TiO 2 films, thus decreasing the probability of recombination of charge carriers and ultimately improving the photoelectrical conversion efficiency. ,,, …”

The photovoltaic performance of CdS quantum dots sensitized solar cell using graphene/TiO2 working electrode

“…Moreover, G sheets have excellent electrical conductivity and could therefore act as bridges to accelerate electron transfer from TiO 2 to the FTO electrode, reducing the possibility of electron-hole recombination rates. Besides, graphene with a twodimensional structure can capture more TiO 2 nanoparticles which provide electronic-transport tunnel and shorten the electronic transmission way [32]. On the other hand, when G/TiO 2 ratio was further increased from 0.2 to 1.0 wt.…”