Two-Carrier Photothermoelectric Effects in GaAs

Harper, James G.; Matthews, Herman E.; Bube, Richard H.

doi:10.1063/1.1659387

Cited by 39 publications

(21 citation statements)

References 4 publications

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“…The photo-Seebeck effect in conventional semiconductors has been reported in earlier studies [7][8][9][10] and recently also demonstrated in an oxide semiconductor. 11 In general, the Seebeck coefficient S decreases with increasing electrical conductivity σ under the light illumination as a consequence of photo-doping effect.…”

Section: Introductionmentioning

confidence: 92%

Photo-Seebeck effect in tetragonal PbO single crystals

Mondal

Okazaki

Taniguchi

et al. 2013

Journal of Applied Physics

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We report the observation of photo-Seebeck effect in tetragonal PbO crystals. The photoinduced carriers contribute to the transport phenomena, and consequently the electrical conductivity increases and the Seebeck coefficient decreases with increasing photon flux density. A parallel-circuit model is used to evaluate the actual contributions of photoexcited carriers from the measured transport data. The photo-induced carrier concentration estimated from the Seebeck coefficient increases almost linearly with increasing photon flux density, indicating a successful photo-doping effect on the thermoelectric property.The mobility decreases by illumination but the reduction rate strongly depends on the illuminated photon energy. Possible mechanisms of such photon-energy-dependent mobility are discussed.

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Section: Introductionmentioning

confidence: 92%

Photo-Seebeck effect in tetragonal PbO single crystals

Mondal

Okazaki

Taniguchi

et al. 2013

Journal of Applied Physics

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“…10) In 1970s, the photo-Seebeck effect has been explored in several semiconductors Si, GaAs, and CdS. [11][12][13] These materials exhibit finite photoresponse for the Seebeck coefficient as well as the conductivity. The light illumination for Ge increases and decreases jSj, naively understood within the photo-doping effect.…”

Section: Introductionmentioning

confidence: 99%

“…Note that the photo-Seebeck effect measured with different photon energies might be a powerful tool to investigate detailed electronic band structure as well. 12) However, there are only a few reports regarding the photo-Seebeck effect, and the thermoelectric transport nature of the photo-induced carriers is poorly understood so far.…”

Section: Introductionmentioning

confidence: 99%

Photo-Seebeck Effect in ZnO

et al. 2012

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We examine how the photo-induced carriers contribute the thermoelectric transport, i.e. the nature of the photo-Seebeck effect, in the wide-gap oxide semiconductor ZnO for the first time. We measure the electrical conductivity and the Seebeck coefficient with illuminating light. The light illumination considerably changes the Seebeck coefficient as well as the conductivity, which is sensitive to the photon energy of the illuminated light. By using a simple parallel-circuit model, we evaluate the contributions of the photo-induced carriers to the conductivity and the Seebeck coefficient, whose relationship shows a remarkable resemblance to that in doped semiconductors. Our results also demonstrate that the light illumination increases both the carrier concentration and the mobility, which can be compared with impurity-doping case for ZnO. Future prospects for thermoelectrics using light are discussed.Comment: 5 pages, 4 figures, to be published in J. Phys. Soc. Jp

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“…The photoSeebeck effect was first observed in germanium by Tauc 18 and was, subsequently, reported in silicon, gallium, arsenic, and cadmium sulfide. [19][20][21] Recently, the Seebeck effect was first reported in a wide-gap oxide semiconductor, zinc oxide (ZnO). 22 Here, we attempted to characterize the reversibility of both the thermoelectricity and photochromism of WO 3 induced by alternating light and dark storage, in addition to photo-thermoelectric properties of this material, as this would potentially expand the function of the smart window by providing not only shade from sunlight, but also the generation of electricity in response to irradiation with sunlight.…”

mentioning

confidence: 99%

Photo-controllable thermoelectric properties with reversibility and photo-thermoelectric effects of tungsten trioxide accompanied by its photochromic phenomenon

Azuma

Kawano

Kakemoto

et al. 2014

Journal of Applied Physics

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The addition of photo-controllable properties to tungsten trioxide (WO3) is of interest for developing practical applications of WO3 as well as for interpreting such phenomena from scientific viewpoints. Here, a sputtered crystalline WO3 thin film generated thermoelectric power due to ultraviolet (UV) light-induced band-gap excitation and was accompanied by a photochromic reaction resulting from generating W5+ ions. The thermoelectric properties (electrical conductivity (σ) and Seebeck coefficient (S)) and coloration of WO3 could be reversibly switched by alternating the external stimulus between UV light irradiation and dark storage. After irradiating the film with UV light, σ increased, whereas the absolute value of S decreased, and the photochromic (coloration) reaction was detected. Notably, the opposite behavior was exhibited by WO3 after dark storage, and this reversible cycle could be repeated at least three times. Moreover, photo-thermoelectric effects (photo-conductive effect (photo-conductivity, σphoto) and photo-Seebeck effect (photo-Seebeck coefficient, Sphoto)) were also detected in response to visible-light irradiation of the colored WO3 thin films. Under visible-light irradiation, σphoto and the absolute value of Sphoto increased and decreased, respectively. These effects are likely attributable to the excitation of electrons from the mid-gap visible light absorption band (W5+ state) to the conduction band of WO3. Our findings demonstrate that the simultaneous, reversible switching of multiple properties of WO3 thin film is achieved by the application of an external stimulus and that this material exhibits photo-thermoelectric effects when irradiated with visible-light.

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Two-Carrier Photothermoelectric Effects in GaAs

Cited by 39 publications

References 4 publications

Photo-Seebeck effect in tetragonal PbO single crystals

Photo-Seebeck effect in tetragonal PbO single crystals

Photo-Seebeck Effect in ZnO

Photo-controllable thermoelectric properties with reversibility and photo-thermoelectric effects of tungsten trioxide accompanied by its photochromic phenomenon

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