Graphene quantum dots optimization of dye-sensitized solar cells

Charge and energy transfer interplay in hybrid sensitized solar cells mediated by graphene quantum dots

“…For instance, in Ref. [32] the immersion time for GQD was 24 h, and the one for dye was 12 h. In Ref. [33] also, the immersion time for dye was 36 h and the GQDs were deposited by spin coating.…”

“…A method to circumvent these issues is to use hybrid sensitizers containing both GQD and conventional dyes such that their absorption spectra cover the useful range of the solar spectrum. Several studies reporting on the interaction between semiconductor quantum dots and different organic dyes were published [30,31], but few data are available for GQDs -dye interaction [32,33]. The proposed explanation for the improved efficiency of hybrid solar cells co-sensitized with GQD and N719 Ru-dye is the injection of hot electrons from GQD into TiO 2 photoanode [32] or the upconversion properties of GQD [33].…”

“…Several studies reporting on the interaction between semiconductor quantum dots and different organic dyes were published [30,31], but few data are available for GQDs -dye interaction [32,33]. The proposed explanation for the improved efficiency of hybrid solar cells co-sensitized with GQD and N719 Ru-dye is the injection of hot electrons from GQD into TiO 2 photoanode [32] or the upconversion properties of GQD [33]. However, for GQD's sizes of several nanometers the photon flux challenge is not met [34] making unlikely for the solar radiation to cause multiphoton processes and generate hot electron populations.…”

Photobleaching and stabilization of carbon nanodots produced by solvothermal synthesis

“…[11][12][13] Studies on the photostability of CDs itself, however, are very limited. Zhao et al demonstrated that the CDs produced by electro-oxidation of graphite showed no appreciable changes in photoluminescence intensity even after continuous exposure to white light of a 8.3 W Xe lamp.…”

Graphene quantum dots decorated electrospun TiO2 nanofibers as an effective photoanode for dye sensitized solar cells

“…Till date, there are only very few reports on GQDs decorated TiO 2 nanoparticles (NPs) as photoanode for the enhancement of photovoltaic performance of DSSC [11][12][13][14]. But, there is no report on the effect of GQDs onto TiO 2 NFs as photoanode for DSSCs.…”