scholarly journals Sol-Gel Processed TiO2 Nanotube Photoelectrodes for Dye-Sensitized Solar Cells with Enhanced Photovoltaic Performance

Nanomaterials ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 296 ◽  
Author(s):  
Nikolai Tsvetkov ◽  
Liudmila Larina ◽  
Jeung Ku Kang ◽  
Oleg Shevaleevskiy
Keyword(s):  
Solar Cells ◽  
Sol Gel ◽  
Dye Sensitized Solar Cells ◽  
Electrical Impedance Spectroscopy ◽  
Tio2 Nps ◽  
Doped Tio2 ◽  
Dye Sensitized ◽  
Electrolyte Interface ◽  
Tio2 Nts ◽  
Sensitized Solar Cells

The performance of dye-sensitized solar cells (DSCs) critically depends on the efficiency of electron transport within the TiO2-dye-electrolyte interface. To improve the efficiency of the electron transfer the conventional structure of the working electrode (WE) based on TiO2 nanoparticles (NPs) was replaced with TiO2 nanotubes (NTs). Sol-gel method was used to prepare undoped and Nb-doped TiO2 NPs and TiO2 NTs. The crystallinity and morphology of the WEs were characterized using XRD, SEM and TEM techniques. XPS and PL measurements revealed a higher concentration of oxygen-related defects at the surface of NPs-based electrodes compared to that based on NTs. Replacement of the conventional NPs-based TiO2 WE with alternative led to a 15% increase in power conversion efficiency (PCE) of the DSCs. The effect is attributed to the more efficient transfer of charge carriers in the NTs-based electrodes due to lower defect concentration. The suggestion was confirmed experimentally by electrical impedance spectroscopy measurements when we observed the higher recombination resistance at the TiO2 NTs-electrolyte interface compared to that at the TiO2 NPs-electrolyte interface. Moreover, Nb-doping of the TiO2 structures yields an additional 14% PCE increase. The application of Nb-doped TiO2 NTs as photo-electrode enables the fabrication of a DSC with an efficiency of 8.1%, which is 35% higher than that of a cell using a TiO2 NPs. Finally, NTs-based DSCs have demonstrated a 65% increase in the PCE value, when light intensity was decreased from 1000 to 10 W/m2 making such kind device be promising alternative indoor PV applications when the intensity of incident light is low.

Al-doped TiO2 Photoanode for Dye-Sensitized Solar Cells

2011 ◽  
Vol 64 (6) ◽  
pp. 820 ◽  
Author(s):  
Fuzhi Huang ◽  
Yi-Bing Cheng ◽  
Rachel A. Caruso
Keyword(s):  
Solar Cells ◽  
Doping Concentration ◽  
Sol Gel ◽  
Dye Sensitized Solar Cells ◽  
Open Circuit ◽  
Tio2 Electrode ◽  
Doped Tio2 ◽  
Dye Sensitized ◽  
A Cell ◽  
Sensitized Solar Cells

Porous aluminium doped TiO2 was prepared through a sol–gel process in the presence of a template. The doping enlarges the band-gap of the anatase TiO2, which modifies the TiO2 electrical properties. The porous Al/TiO2 films were assembled into dye-sensitized solar cells. A 45 mV enhancement of open-circuit photovoltage and 11% increase of fill factor at 2 wt-% doping concentration, and 8.6% improvement of the overall efficiency at 0.5 wt-% doping concentration were achieved relative to that of a cell containing non-doped TiO2 under the same conditions. This advance is attributed to the increase in conductivity with the Al-doping of the TiO2 electrode.

Effect of Mn2+ Substitution into the Hst Lattice of ZnO via sol–gel Route for Boosting the Dye-Sensitized Solar Cells Performance

2021 ◽  
Author(s):  
Deepak Kumbhar ◽  
Sagar Delekar ◽  
Sarita Kumbhar ◽  
Ananta Dhodamani ◽  
Namdev Harale ◽  
...  
Keyword(s):  
Solar Cells ◽  
Sol Gel ◽  
Dye Sensitized Solar Cells ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

scholarly journals Electronic, Structural, and Optical Structure of Mono-Doped and Co-Doped (210) TiO2 Brookite Surfaces for Application in Dye-Sensitized Solar Cells—A First Principles Study

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3918
Author(s):  
Ratshilumela S. Dima ◽  
Lutendo Phuthu ◽  
Nnditshedzeni E. Maluta ◽  
Joseph K. Kirui ◽  
Rapela R. Maphanga
Keyword(s):  
Solar Cells ◽  
Band Gap ◽  
Dye Sensitized Solar Cells ◽  
Visible Region ◽  
Electromagnetic Spectrum ◽  
Doped Tio2 ◽  
Dye Sensitized ◽  
Sensitized Solar Cells ◽  
Co Doped ◽  
Optical Structure

Titanium dioxide (TiO2) polymorphs have recently gained a lot of attention in dye-sensitized solar cells (DSSCs). The brookite polymorph, among other TiO2 polymorphs, is now becoming the focus of research in DSSC applications, despite the difficulties in obtaining it as a pure phase experimentally. The current theoretical study used different nonmetals (C, S and N) and (C-S, C-N and S-N) as dopants and co-dopants, respectively, to investigate the effects of mono-doping and co-doping on the electronic, structural, and optical structure properties of (210) TiO2 brookite surfaces, which is the most exposed surface of brookite. The results show that due to the narrowing of the band gap and the presence of impurity levels in the band gap, all mono-doped and co-doped TiO2 brookite (210) surfaces exhibit some redshift. In particular, the C-doped, and C-N co-doped TiO2 brookite (210) surfaces exhibit better absorption in the visible region of the electromagnetic spectrum in comparison to the pure, S-doped, N-doped, C-S co-doped and N-S co-doped TiO2 brookite (210) surfaces.

scholarly journals High efficiency dye-sensitized solar cells with VOC–JSC trade off eradication by interfacial engineering of the photoanode|electrolyte interface

RSC Advances ◽  
2019 ◽  
Vol 9 (69) ◽  
pp. 40292-40300
Author(s):  
Anantharaj Gopalraman ◽  
Subbian Karuppuchamy ◽  
Saranyan Vijayaraghavan
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
High Efficiency ◽  
Dye Sensitized Solar Cells ◽  
Surface States ◽  
Trade Off ◽  
Interfacial Engineering ◽  
Dye Sensitized ◽  
Electrolyte Interface ◽  
Sensitized Solar Cells

VOC–JSC trade off is eliminated. Newly created surface states by OA in TiO2 facilitated the charge transfer kinetics.

Nb-Doped TiO2: A New Compact Layer Material for TiO2 Dye-Sensitized Solar Cells

2009 ◽  
Vol 113 (16) ◽  
pp. 6878-6882 ◽  
Author(s):  
Sangwook Lee ◽  
Jun Hong Noh ◽  
Hyun Soo Han ◽  
Dong Kyun Yim ◽  
Dong Hoe Kim ◽  
...  
Keyword(s):  
Solar Cells ◽  
Dye Sensitized Solar Cells ◽  
Compact Layer ◽  
Doped Tio2 ◽  
Layer Material ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

scholarly journals Improved Performance of Dye-Sensitized Solar Cells with TiO2 Nanoparticles/Zn-Doped TiO2 Hollow Fiber Photoanodes

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2922 ◽  
Author(s):  
Zainal Arifin ◽  
Suyitno Suyitno ◽  
Syamsul Hadi ◽  
Bayu Sutanto
Keyword(s):  
Solar Cells ◽  
Tio2 Nanoparticles ◽  
Double Layer ◽  
Short Circuit ◽  
Dye Sensitized Solar Cells ◽  
Photocurrent Density ◽  
Light Transmittance ◽  
Doped Tio2 ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

In this study, dye-sensitized solar cells (DSSCs) were fabricated using double-layer photoanodes consisting of TiO2 nanoparticles (NPs) and Zn-doped TiO2 hollow fibers (HFs). The TiO2 HFs were prepared by co-axial electrospinning and used as the light-scattering layer in the DSSC. The thickness variations of the TiO2 NP and Zn-doped TiO2 HF photoanode layers affect the performance of the DSSC, especially the short-circuit photocurrent density. The thickness of the TiO2 NP layer significantly affected the absorbance of photons and N719 dye molecules in the double-layer photoanode, while that of the Zn-doped TiO2 HF layer affected the scattering of light, as indicated by the low light transmittance in the photoanode. Conventional DSSCs consist of single-layer photoanodes, and exhibit relatively low efficiency, i.e., 1.293% and 0.89% for TiO2 NP and Zn-doped TiO2 HF, respectively. However, herein, the highest efficiency of the DSSC (3.122%) was achieved with a 15 μm NP-5 μm HF photoanode, for which the short-circuit photocurrent density, open-circuit photovoltage, and fill factor were 15.81 mA/cm2, 0.566 V, and 34.91%, respectively.

Modelling and Validation of Transmittance from Nanocrystalline Titania film for Photoanodic Action in Dye-Sensitized Solar Cells

2015 ◽  
Vol 4 (1) ◽  
Author(s):  
Divya Jyoti
Keyword(s):  
Solar Cells ◽  
Tin Oxide ◽  
Incident Light ◽  
Sol Gel ◽  
Dye Sensitized Solar Cells ◽  
Dip Coating ◽  
Optical Simulation ◽  
Nanocrystalline Tio2 ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

AbstractA four phase model air/glass/indium doped tin oxide/TiO2 has been studied by modifying Rouard’s model to calculate the final transmittance from TiO2 layer to be used as photoanode in dye-sensitized solar cells. An optical simulation for the reflectance and transmittance has been executed for the constructed nanocrystalline TiO2 films. To validate the theoretical results TiO2 film has been deposited onto indium doped tin oxide (ITO) layer by sol-gel dip coating technique. It has been found that the incident light suffers losses by 5-15% on passage through TiO2 coated ITO layer. Experimentally it has been observed on the basis of efficiency value that meso-nano combination is the best candidate to be used as photoanode in a dye-sensitize solar cell.

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