Zn-Porphyrin propped with hydantoin anchor: synthesis, photophysics and electron injection/recombination dynamics

2018 ◽  
Vol 20 (7) ◽  
pp. 5117-5127 ◽  
Author(s):  
Poomani Ram Kumar ◽  
Ebrahim M. Mothi ◽  
Mohan Ramesh ◽  
Arunkumar Kathiravan
Keyword(s):  
Solar Cell ◽  
Electron Injection ◽  
Dye Sensitized Solar Cell ◽  
Dye Sensitized ◽  
Recombination Dynamics

In this work, Zn-porphyrin with a hydantoin anchor (ZnPHy) was designed and synthesized for dye-sensitized solar cell (DSC) applications.

scholarly journals Theoretical Modification of Cyanidin as Sensitizers in Dye Sensitized Solar Cell (DSSC) Using Rhodanine Acetic Acid as Electron Withdrawing Group

2019 ◽  
Vol 4 (1) ◽  
pp. 34
Author(s):  
Sudarlin Sudarlin
Keyword(s):  
Acetic Acid ◽  
Solar Cell ◽  
Electron Density ◽  
Energy Gap ◽  
Electron Injection ◽  
Excited Electron ◽  
Dye Sensitized Solar Cell ◽  
Lumo Energy ◽  
Dye Sensitized ◽  
Electron Withdrawing Group

<p>Modification of cyanidin as sensitiser on Dye Sensitized Solar Cell (DSSC) has been carried out theoretically in this study using rhodanine acetic acid. The rhodanine acetic acid as electron withdrawing group can increase the electron density of the LUMO state, so injection of the excited electron to the semiconductor can also be increase. The theoretical method used is DFT/B3LYP theory by <em>NWChem</em> software. The calculation shows that the LUMO energy of cyanidin rhodanine acetic is higher than cyanidin, so electron injection to the conduction band of the semiconductor is easier. This condition is supported by reduced of HOMO-LUMO energy gap, so the range of the sunlight that can be involved in the electron excitation process is wider. In addition, the LUMO electron density of the cyanidin rhodanine acetic is localized at rhodanine acetic which makes the distance of the excited electron is closer to the semiconductor, thereby facilitating electron injection.</p>

MODELS OF ELECTRON INJECTION, DIFFUSION AND RECOMBINATION IN DYE-SENSITIZED SOLAR CELLS

2012 ◽  
Vol 26 (17) ◽  
pp. 1230009 ◽  
Author(s):  
J. H. CAI ◽  
H. CHEN ◽  
L. Y. HAN
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Electron Density ◽  
Dye Sensitized Solar Cells ◽  
Electron Injection ◽  
Chemical Mechanism ◽  
Dye Sensitized Solar Cell ◽  
Dye Sensitized ◽  
Physical And Chemical ◽  
Sensitized Solar Cells

In comparison with traditional solid p-n junction solar cells, the process of light-to-electric transformation in dye-sensitized solar cells is complicated. In order to obtain a comprehensive understanding of the physical and chemical mechanism in the complicated process, people have proposed some models to describe electron injection, diffusion and recombination occurred in the process. In this paper, we will give a brief review on these models. The electrical characteristic of dye-sensitized solar cell can be well described by the diffusion model, which was originally proposed by Södergren and later further developed by Ferber, Anta, Bisquert et al. The electron injection, diffusion and recombination manifest themselves via three parameters: injection efficiency η inj , diffusion coefficient D and recombination rate (time) K (τ) in the diffusion equation. Meanwhile, some microscopic models have also been developed to evaluate η inj , D and K. The dynamical behavior of electron injection can be described by a kinetic theory, and corresponding η inj can be understood from a conduction-band fluctuation model or a two-energy-level model. The power-law dependence of D and K on electron density can be well explained by trapping model, but the temperature behavior of D cannot be explained by this model. In the potential barrier model, a weak electron-density-dependent D is obtained, and the observed temperature dependence of D in experiment is naturally expected. Although currently the relevant experimental results cannot be consistently explained within one model, we believe that these models still are important for us to understand the physical and chemical mechanism in these microscopical processes and are helpful for us to further improve the photovoltaic performance of dye-sensitized solar cell.

Tailoring the conduction band of titanium oxide by doping tungsten for efficient electron injection in a sensitized photoanode

Nanoscale ◽  
2014 ◽  
Vol 6 (7) ◽  
pp. 3875-3880 ◽  
Author(s):  
Alex M. Cant ◽  
Fuzhi Huang ◽  
Xiao Li Zhang ◽  
Yang Chen ◽  
Yi-Bing Cheng ◽  
...  
Keyword(s):  
Optical Properties ◽  
Solar Cell ◽  
Titanium Oxide ◽  
Conduction Band ◽  
Electron Injection ◽  
Cell Performance ◽  
Dye Sensitized Solar Cell ◽  
Solar Cell Performance ◽  
Dye Sensitized

The combination of finely tuned chemical and optical properties of the photoanode material enabled a further enhancement of the dye-sensitized solar cell performance.

scholarly journals Comparison of electron injection and recombination on TiO 2 nanoparticles and ZnO nanorods photosensitized by phthalocyanine

2018 ◽  
Vol 5 (7) ◽  
pp. 180323 ◽  
Author(s):  
K. Virkki ◽  
E. Tervola ◽  
M. Ince ◽  
T. Torres ◽  
N. V. Tkachenko
Keyword(s):  
Zinc Oxide ◽  
Solar Cell ◽  
Transient Absorption ◽  
Zno Nanorods ◽  
Electron Injection ◽  
Primary Electron ◽  
Transient Absorption Spectroscopy ◽  
Dye Sensitized Solar Cell ◽  
Dye Sensitized ◽  
Similar Band

Titanium dioxide (TiO 2 ) and zinc oxide (ZnO) semiconductors have similar band gap positions but TiO 2 performs better as an anode material in dye-sensitized solar cell applications. We compared two electrodes made of TiO 2 nanoparticles and ZnO nanorods sensitized by an aggregation-protected phthalocyanine derivative using ultrafast transient absorption spectroscopy. In agreement with previous studies, the primary electron injection is two times faster on TiO 2 , but contrary to the previous results the charge recombination is slower on ZnO. The latter could be due to morphology differences and the ability of the injected electrons to travel much further from the sensitizer cation in ZnO nanorods.

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