Abstract:Dye-sensitized solar cells (DSSCs) are a feasible option for photovoltaic energy. Zinc oxide is an n-type semiconductor employed as photoanode on DSSCs. ZnO thin films were electrodeposited to study the effects of different potentials applied during deposition. SEM images, XRD and UV-Vis analysis were conducted to reveal the morphologic, structural and optical properties of the films at three potentials. DSSCs were assembled and the photovoltaic parameters were obtained through J-V plots. DSSC with 0.031% of e… Show more
“…In this case, the betacyanin pigment would act as the sensitizer. The values of the bandgap energy in this work were close to other reported ZnO dye-sensitized solar cells [21] and natural pigment-modified ZnO materials prepared from laali [22].…”
Section: Characterization Of Composite Materialssupporting
In this work, we reported the synthesis of green-emissive composite materials of zinc oxide (ZnO) and isolated betacyanin pigment from red dragon fruit (RDF) extract utilizing organic linkers, i.e. (3-chloropropyl)trimethoxysilane (CPTMS) and (3-aminopropyl)trimethoxysilane (APTMS). Betacyanin was extracted using a maceration technique, while CPTMS-ZnO and APTMS-ZnO were prepared by mixing ZnO and the respective organic linker in ethanol. The obtained ZnO/CPTMS and APTMS-ZnO composites were separately added into the RDF extract, followed by stirring at room temperature for 24 h. As high as 80 and 90% of betacyanin was successfully impregnated onto CPTMS-ZnO and APTMS-ZnO, respectively. A comparison study was made by preparing RDF-CPTMS and RDF-APTMS first and then introducing them onto ZnO. In this case, as high as 81 and 100% of betacyanin in RDF-CPTMS and RDF-APTMS, respectively, were impregnated onto ZnO. These results revealed that APTMS was a better organic linker than CPTMS and the order of the steps to introduce APTMS was important. The presence of betacyanin on the composite materials was confirmed by FTIR and fluorescence spectroscopy. All the composite materials had an excitation signal at 426–428 nm and emission signals at 459 and 517–518 nm, demonstrating their promising application as green-emissive materials.
“…In this case, the betacyanin pigment would act as the sensitizer. The values of the bandgap energy in this work were close to other reported ZnO dye-sensitized solar cells [21] and natural pigment-modified ZnO materials prepared from laali [22].…”
Section: Characterization Of Composite Materialssupporting
In this work, we reported the synthesis of green-emissive composite materials of zinc oxide (ZnO) and isolated betacyanin pigment from red dragon fruit (RDF) extract utilizing organic linkers, i.e. (3-chloropropyl)trimethoxysilane (CPTMS) and (3-aminopropyl)trimethoxysilane (APTMS). Betacyanin was extracted using a maceration technique, while CPTMS-ZnO and APTMS-ZnO were prepared by mixing ZnO and the respective organic linker in ethanol. The obtained ZnO/CPTMS and APTMS-ZnO composites were separately added into the RDF extract, followed by stirring at room temperature for 24 h. As high as 80 and 90% of betacyanin was successfully impregnated onto CPTMS-ZnO and APTMS-ZnO, respectively. A comparison study was made by preparing RDF-CPTMS and RDF-APTMS first and then introducing them onto ZnO. In this case, as high as 81 and 100% of betacyanin in RDF-CPTMS and RDF-APTMS, respectively, were impregnated onto ZnO. These results revealed that APTMS was a better organic linker than CPTMS and the order of the steps to introduce APTMS was important. The presence of betacyanin on the composite materials was confirmed by FTIR and fluorescence spectroscopy. All the composite materials had an excitation signal at 426–428 nm and emission signals at 459 and 517–518 nm, demonstrating their promising application as green-emissive materials.
“…Nunes et al employed the ZnO nanorods prepared by electrochemical methods for the DSSC and reported as much as 0.31% efficiency. However, the lower value of the efficiency was attributed to the carriers recombination owing to the non‐uniformity of the FTO substrate [3]. Tanmoy et al prepared and studied the DSSC based on the sulphur/nitrogen co‐doped graphene dot decorated ZnO nanorods and reported 0.293% cell efficiency [24].…”
Section: Resultsmentioning
confidence: 99%
“…Further, the growth of ZnO nanostructures can be controlled using the electrochemical process parameters, such as deposition time, applied potential, molar concentration, oxygen flow, and bath temperatures. Nunes et al [3] presented the preparation of ZnO nanorods by varying the negative potential from −1.4 to −0.5 V and employed as a photoanode material in DSSCs. Scanning electron microscopy (SEM) study confirmed the preparation of nanosheets with nodular structure by varying the applied potential.…”
“…Zinc oxide is an environmentally safe material, as it has a high binding energy at room temperature (60 meV) and also has a large direct energy gap (3.37 eV) [1][2][3] and thus can be used in various hardware applications , such as solar cells , smart windows, gas sensors, piezoelectric transducers, transparent high power electronics, varistors, and ultraviolet (UV) light-emitters [4][5][6] . Sub-Extra energy levels will be generated in the band gap of the semiconductors when it is doped with metal 7,8 .…”
Thin films of ZnO nano crystalline doped with different concentrations (0, 6, 9, 12, and 18 )wt. % of copper were deposited on a glass substrate via pulsed laser deposition method (PLD). The properties of ZnO: Cu thin-nanofilms have been studied by absorbing UV-VIS, X-ray diffraction (XRD) and atomic force microscopes (AFM). UV-VIS spectroscopy was used to determine the type and value of the optical energy gap, while X-ray diffraction was used to examine the structure and determine the size of the crystals. Atomic force microscopes were used to study the surface formation of precipitated materials. The UV-VIS spectroscopy was used to determine the type and value of the optical energy gap.
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