Enhanced the Photovoltaic Performance of Dye Sensitized Solar Cells using Cu and Mn doped CdSe Nanoparticles (original) (raw)
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Optik, 2018
Cadmium selenide (CdSe), cobalt and nickel doped cadmium selenide (Ni, Co-CdSe) nanoparticles were synthesized by solvothermal method. The structure, size, morphology and optical properties of the nanoparticles were characterized. The X-ray diffraction pattern supported hexagonal, wurtzite structure and the crystallite sizes were found to be 13.7, 11.94 and 10.07 nm for CdSe, Ni and Co-CdSe nanoparticles respectively and it was also confirmed by TEM analysis. Scanning electron microscopic (SEM) images showed that the dopants adhered to the substrate uniformly and the effective doping was further confirmed by EDX spectral analysis. The band gap energy was computed as 2.5, 3.4 and 3.8 eV for CdSe, Ni and Co-CdSe nanoparticles respectively from UV spectroscopic analysis. The kinetics of electron transport properties were studied by electrochemical analysis and it was found that Co-CdSe has more electrochemical activity compared to Ni-CdSe nanoparticles. DSSCs were fabricated with a dye immobilized semiconductor photo anode (TiO2), redox active electrolytes, ruthenium dye as sensitizer and CdSe, Ni and Co-CdSe as counter electrodes. The maximum power conversion efficiency of solar cells were found to be 2.4 %, 4.1 % and 4.7% for CdSe, Ni and Co-CdSe nanoparticles and it was found that the dopants affect the morphology of the electrode materials which influence the efficiency of solar cell.
Fabrication and Characterization of Zn-doped CdTe nanoparticles based Dye sensitized solar cells
In the present work, undoped and Zn-doped CdTe nanoparticles are grown by chemical reduction method. The grown synthesized nanoparticles are characterized structurally by X-Ray diffraction (XRD) and transmission electron microscopy (TEM). The X-ray diffraction study confirmed the crystal structure of undoped and Zn-doped CdTe nanoparticles. Transmission electron microscopy study indicates the nature and size of the nanoparticles. The grown nanoparticles are characterized optically by Optical Absorption, Photoluminescence (PL) studies. The optical properties of the dye are also studied. The extraction of Hibiscus mutabilis is used as a natural dye. Also photoconductivity study shows the change of photosensitivity and relaxation time with doping. Dye sensitized solar cells based on doped as well as undoped CdTe have been fabricated and characterized through J-V study at dark and under illumination of light condition. The measurement of efficiency and fill factor, open circuit voltage and short circuit current density of the dye sensitized solar device are also carried out.
Cadmium sulfide nanoparticles were prepared by chemical precipitation method in aqueous medium using cadmium acetate and sodium sulfide. The synthesized nanoparticles were characterized by using UV-Vis studies, X-ray diffraction studies (XRD), field emission scanning electron microscopy (FESEM), energy dispersive x-ray analysis (EDAX) and BET analysis. The X-ray diffraction pattern revealed that the synthesized cadmium sulfide nanoparticles were polycrystalline nature and grain size 7 nm was calculated by using Scherer method. Specific surface area, pore volume and pore size were estimated by nitrogen adsorption-desorption analysis. The specific surface area of the synthesized material is 74.26 m 2 /g. The temperature and frequency dependence of dielectric constant, dielectric loss and AC conductivities were studied over a range of frequency (50 Hz to 5 MHz) and temperature (40-200°C). These results demonstrate that the CdS nanoparticles has a potential applications in DSSC's.
Fabrication and Characterization of Natural Dye Sensitized Solar Cell based on CdSe nanorods
The research study represents fabrication and characterizations of CdSe nanorod based dye-sensitized solar cells (DSSCs). In this work natural dyes are used as a photosensitizer to enhance the efficiency of the as prepared solar cells. It was extracted from Clitoria ternatea, Hibiscus rosa-sinensis and Ixora chinensis petals in a cost effective way. A comparative study is made to find the effect of optical absorption properties of different natural dyes on the CdSe nanorod-based DSSCs. The fill factor (FF), efficiency (η), short-circuit current density (J sc), open-circuit voltage (V oc) of the DSSCs are determined from current-voltage measurements and power –voltage characteristics. The incident photon-to-current efficiencies (IPCE) of the DSSCs are also reported.
Fabrication of CdS nanorods and nanoparticles with PANI for (DSSCs) dye-sensitized solar cells
Solar Energy, 2017
A thin film and core-shell dye-sensitized solar cell containing cadmium sulfide (CdS) are fabricated by using low cost solution processes. CdS nanoparticles (NPs) and nanorods (NRs) are embedded within the dye-sensitized solar cells structures and investigated. The morphology of CdS NPs and CdS NRs were controlled and characterized with multiple techniques including scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), Raman scattering, and optical absorption. The inclusion of CdS thin film in zinc oxide/polyaniline (ZnO/PANI) hybrid solar cells increases the energy conversion efficiency from 0.125% to 1.35%. The energy conversion efficiency of the core-shell devices was found higher than that of the corresponding planar structures fabricated under similar conditions. By increasing the crystallinity and absorption, the energy conversion efficiency of the CdS NRs device was increased to 2.44%.
Characterization of Dye Sensitized CdSe Quantum Dots
GRD Journals, 2018
The generation of dye sensitized solar cell (DSSC) and quantum dot-sensitized solar cells (QDSSCs) is considered as the third generation of the solar cell. Cadmium selenide (CdSe) is commonly used as n-type semiconducting layer for heterojunction thin film solar cells. In the present work, synthesis of nanoparticles of CdSe has been done using chemical precipitation technique. And extract dye from pomegranate fruit as the natural dyes. Co-sensitization by using two or more sensitizers with complementary absorption spectra to expand the spectral response range is an effective approach to enhance device performance of quantum dot sensitized solar cells (QDSSCs). To improve the light-harvesting in the visible/near-infrared (NIR) region, CdSe quantum dots (QDs) was combined with pomegranate dye for co-sensitized solar cells. . The prepared CdSe QDs were characterized by UV–Vis absorption, and PL spectra. The CdSe quantum dots were prepared successfully of size 2.9 nm synthesized used LEEH as a capping agent. The size of nanoparticles in pomegranate dye found to be 8.99nm. The proposed solution have been characterized by, UV-Visible spectra and photoluminescence studies. The size of nanoparticles is estimated from Yu model. When CdSe quantum dots are combined with dye, CdSe shows absorption from 387nm to 530nm.
Cadmium oxide nanoparticles were prepared by precipitation method using cadmium acetate and ammonia solution. The synthesized CdO nanoparticles were characterized by using FTIR, X-ray diffraction studies (XRD), Field emission scanning electron microscopy (FE-SEM), Energy dispersive spectrometry (EDS), BET analysis, I-V characterisitics and dielectric studies. FTIR analysis confirmed the Cd-O bond formation in synthesized nanomaterial. The X-ray diffraction pattern revealed that synthesized cadmium oxide nanoparticles are face centered cubic with average crystallite size of 25 nm. The morphology and elemental composition were confirmed by FE-SEM and EDAX.The synthesized CdO nanoparticles showed high surface area of 31.5 m 2 /g, which enables high absorption of dye molecule in DSSC fabrication for increasing the efficiency of solarcell. The temperature and frequency dependence of dielectric constant, dielectric loss and AC conductivities were studied over a range of (50 Hz to 5 MHz) and temperature (40-200°C). Solar cell was fabricated using CdS as photo cathode material, TiO2/CdO as photo anode material, potassium iodide/iodine as electrolyte solution, ruthenium red dye as sensitizer and solar conversion efficiency was found to be 1.62%.
An effective use of nanocrystalline CdO thin films in dye-sensitized solar cells
Solar Energy, 2006
Thin films of cadmium oxide (CdO) were synthesized by layer-by-layer deposition method on indium doped tin oxide (ITO) substrates. Post-deposition annealing at 250°C for 24 h produced pure phase CdO films by removal of trace amount of cadmium hydroxide, as confirmed from X-ray diffractogram. First time employment of CdO in place of TiO 2 in dyesensitized solar cells is reported to check feasibility and cell performance. A dye-sensitized nanocrystalline CdO photo-electrode was obtained by adsorbing cis-dithiocyanato (4,4 0 -dicarboxylic acid-2,2 0 -bipyridide) ruthenium (II) (N3) dye by keeping at 45°C for 20 h. The efficiency of dye-sensitized nanocrystalline CdO thin film solar cell was increased from 0.24% to 2.95% due to dye adsorption. This must be highest reported conversion efficiency for other metal oxides than TiO 2 based dye-sensitized solar cells.
Cadmium sulfide nanoparticles were prepared by chemical coprecipitation method using cadmium acetate and, sodium sulfide usingand tetrabutylammonium bromide (TBAB) as a capping agent. The synthesized nanoparticles were characterized by using UVVis spectroscopic analysis, Xray diffraction analysis (XRD), Field emission scanning electron microscopic analysis (FESEM), Energy dispersive Xray analysis (EDAX) and BET surface area nitrogen adsorptiondesorption analysis. The band gap of capped CdS was calculated by using UVVis absorption spectrum as 3.23 eV. The Xray diffraction pattern revealed that the synthesized cadmium sulfide nanoparticles were polycrystalline nature with wurtzite hexagonal structure and crystallite size was calculated as 7.2 nm by using Debye Scherer method. The surface area, pore volume and pore size were found to be 93.15 m /g, 1.64 × 10 cm /g and 6.2 Å by BET nitrogen adsorptiondesorption analysis. The dielectric constant, dielectric loss and AC conductivities were studied over a range of frequency (50 Hz– 5 MHz) and temperature (40–200 °C). Solar cell was fabricated using cadmium sulfide as photocathode material, titanium dioxide as photoanode material, potassium iodide/iodine as an electrolyte solution, ruthenium dye as a sensitizer and power conversion efficiency was found to be 2.7 %.
Cu-doped ZnO nanoporous film for improved performance of CdS/CdSe quantum dot-sensitized solar cells
Thin Solid Films, 2014
Copper (Cu) doped zinc oxide (ZnO) powders were synthesized by co-precipitation method with different at% (0 and 0.5 at%) of Cu dopant. Cu-doped ZnO nanoporous (NP) films were fabricated to enhance the performance of the ZnO based cadmium sulfide (CdS) and cadmium selenide (CdSe) quantum dot-sensitized solar cells (QDSSCs). The existence of Cu ions in the Cu-doped ZnO NP film was detected by X-ray fluorescence. The surface morphology, microstructure and crystal structure of Cu-doped ZnO NP films were analyzed by scanning electron microscopy, transmission electron microscopy and X-ray diffraction. The optical property of CdS/CdSe co-sensitized Cu-doped ZnO NP film was studied by UV-vis absorption spectroscopy. The photovoltaic performance and electrical property of Cu-doped ZnO CdS/CdSe QDSSCs were studied by current-voltage characteristic curves and electrochemical impedance spectroscopy under air mass 1.5 condition. As a result, short circuit current density and fill factor increased from 9.074 mA/cm 2 and 0.403 to 9.865 mA/cm 2 and 0.427 respectively, based on the enhanced absorbance and electron transport by Cu-doping. This led to the increasing light conversion efficiency from 2.27% to 2.61%.