Surface photovoltage phase spectroscopy – a handy tool for characterisation of bulk semiconductors and nanostructures

Donchev, V.; Kirilov, K.; Ivanov, Ts.; Germanova, K.

doi:10.1016/j.mseb.2006.01.010

Cited by 131 publications

(97 citation statements)

References 17 publications

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“…This is confirmed by the spectral behaviour of the SPV phase, which increases towards -0º with increasing the photon energy (see [6] for more detailed explanations). Therefore a builtin electric field is present in the surface region where the QDs, QWs and SCH layers are situated.…”

Section: Resultssupporting

confidence: 53%

“…The experimental set-up of the SPS is described elsewhere [6]. A conductive transparent electrode (probe) is fixed in front of the sample surface and the variations of the photovoltage, caused by periodic light excitation, are measured by means of Lock-in detection.…”

Section: Methodsmentioning

confidence: 99%

“…In this work we extend the characterisation of such structures by studying their optical absorption. For this purpose we apply surface photovoltage (SPV) spectroscopy (SPS) that is a high sensitive and contactless characterization technique, considered as an alternative for the optical absorption spectroscopy of nanostructures [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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Surface photovoltage spectroscopy of interdiffused InAs/InGaAlAs quantum dashes‐in‐well structure

Ivanov

Wang

Djie

et al. 2007

Phys. Status Solidi (c)

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We report room temperature surface photovoltage (SPV) spectroscopy studies of both as-grown and interdiffused InAs quantum dash (QD)-in-InAlGaAs quantum well (QW) structures grown by molecular beam epitaxy on (100) InP substrates. The interdiffusion is achieved by means of rapid thermal annealing at 800 ºC for 30 s. The SPV spectra reveal step-like structures related to the optical absorption in the QDs, QWs, InGaAlAs separate carrier confinement layer, InAlAs lower cladding layer and InP substrate. The annealing results in a high-energy shift of these spectral structures. The shift is attributed to the group-III atoms intermixing from the thermal induced interdiffusion across the heterointerfaces. The effect of interdiffusion is larger for the elements with larger surface-to-volume ratio (QDs and QWs). The blue shift of the QD transition is observed also in the photoluminescence spectra. The results contribute to the optimization of the technological procedure for QD bandgap tuning via the interdiffusion technique.

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Section: Resultssupporting

confidence: 53%

Section: Methodsmentioning

confidence: 99%

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Surface photovoltage spectroscopy of interdiffused InAs/InGaAlAs quantum dashes‐in‐well structure

Ivanov

Wang

Djie

et al. 2007

Phys. Status Solidi (c)

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“…UV-Vis diffuse reflectance spectra were collected on a TU-1901 UVVis spectrophotometer, which was equipped with an integrating sphere, and BaSO 4 was used as the reference. The measurements of surface photovoltage spectroscopy (SPS) were carried out according to the procedure described in reference (22,23).…”

Section: Characterization Of the Photocatalystsmentioning

confidence: 99%

Enhanced Photo-induced Charge Separation and Simulated Solar Photocatalytic Activity of α-Fe2O3/BiOCl Prepared In-situ

Liu

Zhong

et al. 2015

Journal of Advanced Oxidation Technologies

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Abstract:In this paper, α-Fe 2 O 3 /BiOCl composites were in-situ prepared by a hydrothermal routine and characterized by BET surface area, X-ray diffraction (XRD), UV/Vis diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM) and surface photovoltage spectroscopy (SPS), respectively. The separation efficiency of photo-induced charges was investigated using benzoquinone (BQ) as scavenger. The relationship between α-Fe 2 O 3 loading and the photocatalytic performance was investigated. When the molar ratio of Fe/Bi is 1/3, the composite material exhibits higher photocatalytic performance than the pure α-Fe 2 O 3 and BiOCl towards decolorization of Methyl Orange (MO) aqueous solution under the simulated sun light irradiation. The enhanced mechanism was also discussed.

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“…For example, Sharma et al [6] have studied SPV and phase spectral dependences in bulk semi-insulating GaAs, where the energy bands at the surface are almost flat and the main contribution to the SPV signal measured under super-bandgap (sub-bandgap) excitation comes from the Dember effect (defect level related processes). Also when combined with the phase spectrum, the SPV measurements will be able to analyze semiconductors with complicated nanostructures [18,19]. The introduction of the SPV phase spectrum and detailed relationship between the SPV amplitude and the SPV phase has been discussed by Donchev and co-workers [18].…”

Section: Introductionmentioning

confidence: 99%

Surface photovoltage phase spectroscopy study of the photo-induced charge carrier properties of TiO2 nanotube arrays

et al. 2011

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By using the surface photovoltage (SPV) technique based on a lock-in amplifier, surface states located 3.1 eV below the conduction band of TiO 2 have been detected in TiO 2 nanotube arrays prepared by anodization of titanium foil in fluoride-based ethylene glycol solution. The photo-induced charge transportation behavior of TiO 2 nanotube arrays was also studied by qualitatively analyzing their SPV phase spectra measured under different external bias. When a negative bias was applied, carriers excited from surface states have the same transportation properties as those excited from the valence band; in contrast, when a positive bias was applied, these two kinds of photo-excited carriers exhibit different transportation behavior.surface photovoltage, phase spectra, TiO 2 nanotube arrays, surface state, charge carrier property

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Surface photovoltage phase spectroscopy – a handy tool for characterisation of bulk semiconductors and nanostructures

Cited by 131 publications

References 17 publications

Surface photovoltage spectroscopy of interdiffused InAs/InGaAlAs quantum dashes‐in‐well structure

Surface photovoltage spectroscopy of interdiffused InAs/InGaAlAs quantum dashes‐in‐well structure

Enhanced Photo-induced Charge Separation and Simulated Solar Photocatalytic Activity of α-Fe2O3/BiOCl Prepared In-situ

Surface photovoltage phase spectroscopy study of the photo-induced charge carrier properties of TiO2 nanotube arrays

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