Piezo-effect and physics of CdS-based thin-film photovoltaics

Shvydka, Diana; Drayton, Jennifer; Compaan, A.; Karpov, V. G.

doi:10.1063/1.2056607

Cited by 36 publications

(21 citation statements)

References 13 publications

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“…Moreover, CdS is one of the most common window layer used in different photovoltaic cell structures. Recently, a strong reversible piezo-effect in CdTe/CdS photovoltaic consistent with the piezo parameters of CdS was reported by Shvydka et al [21]. The results induced understanding of the concept of piezo-photovoltaics and suggested specific practical implications.…”

Section: Introductionsupporting

confidence: 61%

Free-standing nanocrystalline-Cadmium sulfide/Polyvinylidene fluoride composite thin film: synthesis and characterization

Bhunia

Ghosh

et al. 2015

J Polym Res

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Nanocrystalline Cadmium sulfide (CdS) impregnated polyvinylidene fluoride (PVDF) composite freestanding flexible films were prepared by sol-gel technique. The films were poled in vacuum under high electric field. Effect of CdS loading in PVDF host matrix on the optical properties was studied critically for the as-deposited and poled samples. The reduction in the relative intensities of the peaks arising out of α -PVDF as compared to that of β-PVDF for the poled samples was observed in X-ray diffraction (XRD) studies. This type of observation indicates a possible transition from α to β phase due to poling. Modulation of optical and microstructural properties with CdS loading was also addressed. Bonding environment was studied by X-ray photoelectron spectroscopy (XPS) and Fourier transformed infrared spectroscopy measurements. XPS studies indicated the presence of highly aligned CdS nanocrystallites in the poled PVDF matrix which may effectively modulate the piezoelectric behavior of the composite film. The Photoluminescence (PL) spectra recorded as above for a representative unpoled and poled nano-CdS/PVDF composite film.

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Section: Introductionsupporting

confidence: 61%

Free-standing nanocrystalline-Cadmium sulfide/Polyvinylidene fluoride composite thin film: synthesis and characterization

Bhunia

Ghosh

et al. 2015

J Polym Res

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“…Piezoelectric effects around GBs could directly affect the doping and transport properties in these materials. 55 In particular, x-ray microdiffraction experiments are currently in progress in order to correlate such experimental results with direct measurements of the stress tensor around GBs.…”

Section: Discussionmentioning

confidence: 99%

Local redistribution of dopants and defects induced by annealing in polycrystalline compound semiconductors

et al. 2009

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International audienceThe annealing of chlorine-doped polycrystalline CdTe films leads to the occurrence of an abnormal grain structure with the formation of both primary and secondary grains, the latter being larger and growing at the expense of the former. The spatial distribution of dopants and defects has been investigated within both types of grains by time-of-flight secondary-ion-mass spectroscopy imaging and spatially resolved cathodoluminescence. It is found that chlorine atoms similarly segregate in the vicinity of grain boundaries in both primary and secondary grains, whereas chlorine donors are homogeneously distributed away from grain boundaries. It is shown that, contrary to primary grains, secondary grains exhibit specific concentration processes around grain boundaries, such as cadmium vacancy accumulation and dislocation piling up. The existence of long-range stresses around grain boundaries only within secondary grains is also evidenced and attributed to piezoelectric effects. Grain boundaries thus act as getters for dopants and defects by draining them from the interior of secondary grains. These physical mechanisms emphasize efficient purifying effects associated with the beneficial formation and growth of secondary grains within an abnormal grain structure as induced by annealing. The depicted processes can be applied to a wide variety of polycrystalline compound semiconductors and can find direct applications in the field of solar cells based on these materials

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“…As an example, its photocatalytic behavior can be employed for hydrogen generation, 10 its chemoresistivity allows fabrication of conductometric gas sensors, 11 and its chemiluminescence can serve to the realization of photoelectrochemical reporter units in analysis of biological processes like tyrosinase. 12 Other than its appreciated chemical-physical properties, CdS also impacts other research fields: CdS-based films show also piezoelectric effects, 13 photoconductivity, 14 electroluminescence, 15 which lead to employments as piezoelectric transducer, photoresistor, solar cell, 16 and more. Scope of the present paper is to highlight its photo-enhanced properties that modify the chemical activity at surface.…”

mentioning

confidence: 99%

Resonant photoactivation of cadmium sulfide and its effect on the surface chemical activity

Giberti

Fabbri

Gaiardo³

et al. 2014

Applied Physics Letters

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Photo-enhanced surface chemical activity of cadmium sulfide gives rise to a wide class of surface-dependent phenomena, such as heterogeneous photocatalysis, chemoresistivity and chemiluminescence, which have several technological and scientific applications. In this work, the photochemical properties of nanostructured cadmium sulfide films are investigated by means of electrical conductance measurements in controlled atmosphere, while irradiated by light of wavelengths ranging from 400 to 645 nm. Chemisorption of benzene, carbon monoxide, methane, ethanol and hydrogen sulfide onto CdS surface has been analyzed as a function of the wavelength, in a gas concentration range of the order of parts per million. It resulted that the increase of photoconductance with gas adsorption is resonant with the bandgap energy. It turns out that this resonant enhancement of the surface chemical activity can be of advantage for all the optical and chemical mechanisms that depend upon it. An interpretation of these results, in terms of electronic optical transitions and Fermi level shift induced by light, is proposed

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Piezo-effect and physics of CdS-based thin-film photovoltaics

Cited by 36 publications

References 13 publications

Free-standing nanocrystalline-Cadmium sulfide/Polyvinylidene fluoride composite thin film: synthesis and characterization

Free-standing nanocrystalline-Cadmium sulfide/Polyvinylidene fluoride composite thin film: synthesis and characterization

Local redistribution of dopants and defects induced by annealing in polycrystalline compound semiconductors

Resonant photoactivation of cadmium sulfide and its effect on the surface chemical activity

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