Poonam Suri - Academia.edu (original) (raw)

Poonam Suri

Agnaldo Alves related author profile picture

Aurelien Du Pasquier related author profile picture

Litao Sun related author profile picture

Tsukasa Yoshida related author profile picture

Gerrit Boschloo related author profile picture

K Kalyanasundaram related author profile picture

Hideki Minoura related author profile picture

Franco Decker related author profile picture

Asim Bhaumik related author profile picture

Yahia Chergui related author profile picture

Uploads

Papers by Poonam Suri

Research paper thumbnail of Photovoltaic performance of dye-sensitized ZnO solar cell based on Eosin-Y photosensitizer

MATERIALS SCIENCE-POLAND

The paper reports on the fabrication and characterization of dye sensitized solar cells using ZnO... more The paper reports on the fabrication and characterization of dye sensitized solar cells using ZnO due to its stability against photo-corrosion and photochemical properties similar to TiO2. Thin films of nanocrystalline ZnO and Al-doped ZnO (AZO) were deposited on transparent conducting oxide glass using glass rod spreading method. Both doped and undoped ZnO films were found to be polycrystalline in nature. The ZnO electrode was dye sensitized by using an organic dye, Eosin-Y. The maximum quantum efficiency appears at the wavelength of 550 nm in both cases. However, the maximum quantum efficiency is higher (12%) in the case of ZnO cell electrode than AZO (7%) cell. The electric energy conversion efficiency was found to be 1.43% and 0.6% for undoped ZnO and Al-doped ZnO electrodes respectively. The lower conversion efficiency of the Al-doped ZnO solar cell could be attributed to lower injection efficiency due to less porosity in dye sensitized Al-doped ZnO electrode.

Research paper thumbnail of Synthesis of nanocrystalline ZnO powder via sol–gel route for dye-sensitized solar cells

This paper reports the growth mechanism of sol–gel-derived nanocrystalline ZnO powder. The influe... more This paper reports the growth mechanism of sol–gel-derived nanocrystalline ZnO powder. The influence of pH value of the sol on the crystallite size, morphology and structure of ZnO powder was investigated by using X-ray diffraction, transmission and scanning electron microscopy. Maximum size nanocrystallite (∼14 nm) of ZnO powder was obtained for pH value of 9. An increase in the band gap (blue shift) was observed with decrease in the size of the ZnO nanocrystallites. The variation in band gap was found to be in agreement with theoretical calculations using effective mass model. The growth mechanism of ZnO particles from zinc acetate dihydrate precursor by the sol–gel process has been discussed in terms of solvation, hydrolysis and polymerization. The synthesized ZnO powders were successfully used as the electrode material for dye-sensitized solar cells.

Research paper thumbnail of Effect of electrolytes on the photovoltaic performance of a hybrid dye sensitized ZnO solar cell

Solar Energy Materials and Solar Cells, 2007

The efficiency of dye sensitized solar cell depends on the number of factors such as impedance du... more The efficiency of dye sensitized solar cell depends on the number of factors such as impedance due to anions in the electrolytes, oxidation-reduction process of anions and size of cations of the electrolyte. This paper reports the effect of electrolytes on the photovoltaic performance of hybrid dye sensitized ZnO solar cells based on Eosin Y dye. The size of the cations has been varied by choosing different electrolytes such as LiBr+Br 2 , LiI+I 2 , tetrapropylammonium iodide +I 2 in mixed solvent of acetronitrile and ethylene carbonate. The impedance of anions has been determined by electrochemical impedance spectra. It is observed that Br À /Br 3 À offers high impedance as compared to I À /I 3 À couple. The oxidation-reduction reactions of electrolytes are measured by linear sweep voltammogram. It is found that Br À /Br 3 À is more suitable than an I À /I 3 À couple in dye sensitized solar cell (DSSC) in terms of higher open-circuit photovoltage production and higher overall energy conversion efficiency. This is attributed to more positive potential of the dye sensitizer than that of Br À /Br 3 À. The gain in V oc was due to the enlarged energy level difference between the redox potential of the electrolyte and the Fermi level (E f) of ZnO and the suppressed charge recombination as well.

Research paper thumbnail of Mechanism of charge recombination and IPCE in ZnO dye‐sensitized solar cells having I−/I 3− and Br−/Br 3− redox couple

Mechanism of charge recombination and IPCE in ZnO dye‐sensitized solar cells having I−/I 3− and Br−/Br 3− redox couple

Progress in Photovoltaics: Research and …

The influence of intensity and wavelength variation on the solar cell parameters of two different... more The influence of intensity and wavelength variation on the solar cell parameters of two different ZnO-based liquid state DSSCs named as Cell (A) ZnO/EosinY/LiI and Cell (B) ZnO/EosinY/LiBr was studied. It was found that Voc and Isc depend logarithmically and linearly on light ...

Research paper thumbnail of Photovoltaic performance of dye-sensitized ZnO solar cell based on Eosin-Y photosensitizer

MATERIALS SCIENCE-POLAND

The paper reports on the fabrication and characterization of dye sensitized solar cells using ZnO... more The paper reports on the fabrication and characterization of dye sensitized solar cells using ZnO due to its stability against photo-corrosion and photochemical properties similar to TiO2. Thin films of nanocrystalline ZnO and Al-doped ZnO (AZO) were deposited on transparent conducting oxide glass using glass rod spreading method. Both doped and undoped ZnO films were found to be polycrystalline in nature. The ZnO electrode was dye sensitized by using an organic dye, Eosin-Y. The maximum quantum efficiency appears at the wavelength of 550 nm in both cases. However, the maximum quantum efficiency is higher (12%) in the case of ZnO cell electrode than AZO (7%) cell. The electric energy conversion efficiency was found to be 1.43% and 0.6% for undoped ZnO and Al-doped ZnO electrodes respectively. The lower conversion efficiency of the Al-doped ZnO solar cell could be attributed to lower injection efficiency due to less porosity in dye sensitized Al-doped ZnO electrode.

Research paper thumbnail of Synthesis of nanocrystalline ZnO powder via sol–gel route for dye-sensitized solar cells

This paper reports the growth mechanism of sol–gel-derived nanocrystalline ZnO powder. The influe... more This paper reports the growth mechanism of sol–gel-derived nanocrystalline ZnO powder. The influence of pH value of the sol on the crystallite size, morphology and structure of ZnO powder was investigated by using X-ray diffraction, transmission and scanning electron microscopy. Maximum size nanocrystallite (∼14 nm) of ZnO powder was obtained for pH value of 9. An increase in the band gap (blue shift) was observed with decrease in the size of the ZnO nanocrystallites. The variation in band gap was found to be in agreement with theoretical calculations using effective mass model. The growth mechanism of ZnO particles from zinc acetate dihydrate precursor by the sol–gel process has been discussed in terms of solvation, hydrolysis and polymerization. The synthesized ZnO powders were successfully used as the electrode material for dye-sensitized solar cells.

Research paper thumbnail of Effect of electrolytes on the photovoltaic performance of a hybrid dye sensitized ZnO solar cell

Solar Energy Materials and Solar Cells, 2007

The efficiency of dye sensitized solar cell depends on the number of factors such as impedance du... more The efficiency of dye sensitized solar cell depends on the number of factors such as impedance due to anions in the electrolytes, oxidation-reduction process of anions and size of cations of the electrolyte. This paper reports the effect of electrolytes on the photovoltaic performance of hybrid dye sensitized ZnO solar cells based on Eosin Y dye. The size of the cations has been varied by choosing different electrolytes such as LiBr+Br 2 , LiI+I 2 , tetrapropylammonium iodide +I 2 in mixed solvent of acetronitrile and ethylene carbonate. The impedance of anions has been determined by electrochemical impedance spectra. It is observed that Br À /Br 3 À offers high impedance as compared to I À /I 3 À couple. The oxidation-reduction reactions of electrolytes are measured by linear sweep voltammogram. It is found that Br À /Br 3 À is more suitable than an I À /I 3 À couple in dye sensitized solar cell (DSSC) in terms of higher open-circuit photovoltage production and higher overall energy conversion efficiency. This is attributed to more positive potential of the dye sensitizer than that of Br À /Br 3 À. The gain in V oc was due to the enlarged energy level difference between the redox potential of the electrolyte and the Fermi level (E f) of ZnO and the suppressed charge recombination as well.

Research paper thumbnail of Mechanism of charge recombination and IPCE in ZnO dye‐sensitized solar cells having I−/I 3− and Br−/Br 3− redox couple

Mechanism of charge recombination and IPCE in ZnO dye‐sensitized solar cells having I−/I 3− and Br−/Br 3− redox couple

Progress in Photovoltaics: Research and …

The influence of intensity and wavelength variation on the solar cell parameters of two different... more The influence of intensity and wavelength variation on the solar cell parameters of two different ZnO-based liquid state DSSCs named as Cell (A) ZnO/EosinY/LiI and Cell (B) ZnO/EosinY/LiBr was studied. It was found that Voc and Isc depend logarithmically and linearly on light ...

Log In