The effect of pH and selenization on the properties of CuInSe2 thin films prepared by electrodeposition technique for device applications

Rohom, Ashwini B.; Londhe, Priyanka U.; Chaure, Nandu B.

doi:10.1007/s10008-014-2582-0

Cited by 13 publications

(9 citation statements)

References 26 publications

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“…First, the N-GQDs are bound to the surface of the CIS/ZnS QDs and serve as ligands instead of MPA. 44 − 60 Second, the carboxylate groups in MPA are bonded with N-GQDs and lead to energy transfer between N-GQDs and CIS/ZnS QDs. Consequently, N-GQDs can act as a capping agent with MPA on the CIS core.…”

Section: Resultsmentioning

confidence: 99%

“…The full width at half-maximum (FWHM) of the nanocomposite is calculated to be 98 nm, while that for N-GQDs is 80 nm that detects recombination in the hybrid structures of N-GQDs and CIS/ZnS QDs. − There are two approaches to quenching the emission of QDs. First, the N-GQDs are bound to the surface of the CIS/ZnS QDs and serve as ligands instead of MPA. − Second, the carboxylate groups in MPA are bonded with N-GQDs and lead to energy transfer between N-GQDs and CIS/ZnS QDs. Consequently, N-GQDs can act as a capping agent with MPA on the CIS core. , The results thus suggest that a lower concentration of CIS/ZnS with 0.5 favors and produces an optimum fluorescence in the nanocomposite.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, in a strong basic medium at pH 8 and 10, an increase in PL intensity is observed due to the deprotonation of carboxylate groups in CIS/ZnS QDs and N-GQDs. However, this forms an anionic double layer, disturbs the electron transfer between N-GQDs and CIS/ZnS QDs, and decreases the stability of the nanocomposites. − …”

Section: Resultsmentioning

confidence: 99%

“…According to biomolecules, the quenching effects of cholesterol and AA are strongly comparable to those of glucose and cholic acid, which quenched the nanocomposite emission by 46 and 32%, respectively. This is attributed to the presence of hydroxyl groups adsorbed on the surface of NG/CIS/ZnS QDs, and the excited electrons in the nanocomposite are transferred to AA, leading to quenching of the PL spectra of NG/CIS/ZnS QDs. − It can be concluded that there may be a slight interference of detection of cholesterol by the nanocomposite QDs with glucose and cholic acid.…”

Section: Resultsmentioning

confidence: 99%

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Nanocomposite of CuInS/ZnS and Nitrogen-Doped Graphene Quantum Dots for Cholesterol Sensing

et al. 2021

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In this paper, nitrogen graphene quantum dots (N-GQDs) and copper indium sulfide/zinc sulfide (CIS/ZnS) QDs were synthesized via facile hydrothermal and aqueous solution routes, respectively. Herein, a fluorescent nanocomposite has been synthesized between N-GQDs and CIS/ZnS QDs in an aqueous phase. This nanocomposite was characterized by photoluminescence, Raman, and ultraviolet–visible (UV–vis) spectroscopies, high-resolution transmission electron microscopy (HRTEM), and X-ray diffraction (XRD). This fluorescent nanocomposite was developed as a highly sensitive, selective nonenzymatic cholesterol optical biosensor in 0.312–5 mM cholesterol. HRTEM micrographs confirmed the preparation of CIS/ZnS QDs and N-GQDs with average diameters of 3 and 5 nm, respectively. The as-prepared NG/CIS/ZnS QD nanocomposite had a high sensitivity for cholesterol with a wide linear range of concentration of 0.312–5 mM with an excellent correlation coefficient (R 2) of 0.9688 and limit of detection (LOD) of 0.222 mM.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Nanocomposite of CuInS/ZnS and Nitrogen-Doped Graphene Quantum Dots for Cholesterol Sensing

et al. 2021

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“…14 One step, multi-step, pulsed, stacked layer electrodeposition techniques are commonly adapted to prepared CIS, CIGS and CZTS chalcopyrite thin lms. [15][16][17][18][19][20] The power conversion efficiency 7.0% is reported by Qiu et al 21 using one-step electrodeposition from aqueous bath. A non-aqueous electrolyte can be used to deposit semiconductor, oxide and insulator thin lms, which allows depositing layer at higher growth potentials which can be limited in aqueous medium due to hydrogen evolution.…”

Section: Introductionmentioning

confidence: 82%

CuInSe₂ thin film solar cells prepared by low-cost electrodeposition techniques from a non-aqueous bath

2015

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Polycrystalline CuInSe2 (CIS) thin films have been prepared by low-cost electrochemical method from non-aqueous ethylene glycol solvent onto cadmium sulfide (CdS) thin films. The codeposition potential for Cu, In and Se was optimized with cyclic voltammetry measurements. CIS layers were electrodeposited at -1.1, -1.3 and -1.5 V versus Ag/AgCl references in air-tight custom made electrodeposition cell. The films were selenized at 400 °C for 20 minutes. The optical, structural, morphological, compositional and optoelectronic properties of as-prepared and selenized samples were studied using UV-Vis spectrophotometer, X-ray diffractometer, Transmission electron microscopy (TEM), Scanning electron microscope (SEM), Energy dispersive x-ray analysis (EDAX) and current-voltage (I-V) measurements. Three prominent sharp peaks of tetragonal CIS, (112), (204)/(220), and (312/116) were revealed in all asprepared and selenized samples. Upon selenization the crystallinity of the samples was found to be improved remarkably. Compact, void free, and nearly uniform thin films of grain size ~ 1 µm were deposited. The as-deposited and selenized CIS samples were Cu-rich whereas the contents of Se was ~ 50% obtained by EDAX analysis. The value of inter-planer distance, d = 3.339 Å was measured by HRTEM corresponds to (112) plane of tetragonal CIS crystal structure. The circular spotted rings observed in selected area diffraction (SAD) pattern were confirmed (112), (204)/(220) and (312)/(116) reflections of CIS. The solar cell parameters, Voc, Jsc, FF and efficiency were found to be 303 mV, 28 mA/cm 2 and FF ~ 53 % and η = 4.5 % for the CIS film deposited at -1.5 V. The values of shunt conductance, GD = 2.5 mS/cm 2 and GL = 7.9 mS/cm 2 and series resistance, RD = 0.81 Ωcm 2 and RL = 0.19 Ωcm 2 were calculated for dark and illuminated conditions. Mott-Schottky analysis is also carried out on the final solar cell in dark and illuminated condition to study the carrier concentration and defects in the CdS/CIS interface.

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Study of electrochemically grown copper indium diselenide (CIS) thin films for photovoltaic applications

Rohom

Londhe

Bhand

et al. 2016

J Mater Sci: Mater Electron

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CIS thin films have been grown electrochemically from an aqueous electrolyte at room temperature on fluorine doped tin oxide coated glass substrate at different deposition potentials ranging from -0.7 to -1.0 V versus Ag/AgCl reference electrode. Cyclic voltammetry was studied at slow scan rate to optimize the deposition potential. The thin film samples were selenized in a tubular furnace at 400°C for 20 min. X-ray diffraction and Raman analysis was used to study the structural properties. Optical absorption, scanning electron microscopy and energy dispersive X-ray analysis (EDAX) have been used to investigate the band-gap, surface morphology and compositional analysis. Electrical properties were studied with the help of current-voltage measurements. Conductivity type for CIS thin films was studied by using photo-electrochemical study. The prominent reflections (112), (204/220) and (312/ 116) of tetragonal chalcopyrite CIS have been revealed for all as-grown and selenized samples. The energy band gap of the selenized CIS thin film deposited at various deposition potentials was found to be *1.03 to 1.24 eV. Granular, uniform and void free surface was observed in as-prepared sample, while large clusters were noticed in selenized samples. EDAX results reveal that the stoichiometric CIS thin film are deposited -0.8 V, however, Curich and In-rich CIS layers were grown at lower and higher cathodic deposition potentials, deviated from -0.8 V. The values ideality factor (g) calculated from I-V measurements were found to be decreased upon selenization. The Raman spectra of stoichiometric CIS thin film shows dominant A1 mode with spectral features sensitive to the microcrystalline quality of the layers. A ordered defect compound layer and secondary phases of CuSe are observed in In-rich and Cu-rich CIS layers, respectively.

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The effect of pH and selenization on the properties of CuInSe2 thin films prepared by electrodeposition technique for device applications

Cited by 13 publications

References 26 publications

Nanocomposite of CuInS/ZnS and Nitrogen-Doped Graphene Quantum Dots for Cholesterol Sensing

Nanocomposite of CuInS/ZnS and Nitrogen-Doped Graphene Quantum Dots for Cholesterol Sensing

CuInSe₂ thin film solar cells prepared by low-cost electrodeposition techniques from a non-aqueous bath

Study of electrochemically grown copper indium diselenide (CIS) thin films for photovoltaic applications

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The effect of pH and selenization on the properties of CuInSe2 thin films prepared by electrodeposition technique for device applications

Cited by 13 publications

References 26 publications

Nanocomposite of CuInS/ZnS and Nitrogen-Doped Graphene Quantum Dots for Cholesterol Sensing

Nanocomposite of CuInS/ZnS and Nitrogen-Doped Graphene Quantum Dots for Cholesterol Sensing

CuInSe2 thin film solar cells prepared by low-cost electrodeposition techniques from a non-aqueous bath

Study of electrochemically grown copper indium diselenide (CIS) thin films for photovoltaic applications

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CuInSe₂ thin film solar cells prepared by low-cost electrodeposition techniques from a non-aqueous bath