Enhanced performance of dye-sensitized solar cells aided by Sr,Cr co-doped TiO 2 xerogel films made of uniform spheres

Hydrothermal synthesis of TiO2 nanoparticles doped with trace amounts of strontium, and their application as working electrodes for dye sensitized solar cells: tunable electrical properties & enhanced photo-conversion performance

“…The ionic radius of Sr 2+ (1.18Å) is higher than that of Ti 4+ (0.60Å) and so the insertion of larger ions into the lattice of smaller ions may enhance the possibility of local lattice distortions. 23 The reduction in average crystallite size with increasing concentration of Sr dopant has also been reported by A. Bakhshayesh et al 30 Hamedani et al 29 have reported that Sr 2+ enters the TiO 2 lattice either in the interstitial sites or as a substitution for Ti 4+ . The existence of larger sized Sr 2+ in substitutional sites can cause volume compensating oxygen vacancies; such defect clusters would occur along different [hkl] directions in the TiO 2 lattice resulting in an alteration of the atomic distances 31 and leading to distortion of the structure.…”

“…The simultaneous improvement of J sc and V oc values has been reported by many researchers. 24,30,34 The improvement in J sc is due to both the narrowed band gap of the 50 ppm Sr doped TiO 2 that facilitates the better photoexcitation of the semiconductor, and the increased dye absorption. The efficient photoexcitation of TiO 2 and enhanced photo-injection contributes to the higher electron density.…”

“…These oxygen vacancy lattice defects, resulting from the substitution of Sr 2+ in the sites of Ti 4+ , can trap photo-generated holes, elongating the life of the photo-excited electrons and holes and thereby increasing J sc . 23,29,30,34 The life times of the photon excited charges were measured using EIS studies and are presented in the next section. The increase in V oc for Sr doped TiO 2 samples up to 50 ppm is due to the enhancement in the number of electrons being injected and/or the suppression of recombination of injected electrons.…”

Development of TiO2 Nanomaterials and Dyes Selection (using DFT) for DSSC Applications –A Stepwise Review

“…Table 1 Shows the Summary of some efficiency of DSSCs with TiO2 as a photoanode. Bakhshayesh et al [141] reported the enhanced performance of dye-sensitized solar cells aided by Sr,Cr co-doped TiO2 xerogel films made of uniform spheres. The solar cells were fabricated based on different concentrations of Sr and Cr.…”

Fe-Cu Compounds in Dye-Sensitized Solar Cells: Influence of Magnetic Field on Mesoporous Structure

“…For even higher energy conversion efficiency values of DSSCs, researchers are improving the performance of individual cell components and, relatable to the work presented here, enhancing the mesoporous nanocrystalline film deposited on the transparent electrode which is known to improve its radiation absorptivity in the UV-Vis ranges on one hand, and enhance the adsorption of dye sensitizers [4][5][6]. While titanium dioxide (TiO2) is the most commonly used mesoporous material, a cheaper, recyclable and more optically absorptive alternative is sought, some of which include integrated schiff bases where they are able to achieve large surface areas and efficient electron transfer [7][8][9][10][11][12]. Another example is to replace it with a mechanically alloyed p-type Fe-Cu compound semiconductor that is found to enhance the UV-Vis absorptivity to 81% compared to that of TiO2 [13].…”