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Volumn 1, Issue 11, 2013, Pages 834-843

Persistent photoconductivity in 2D electron gases at different oxide interfaces

Author keywords

2D electron gas; Interfaces; Oxides; Photoconductivity

Indexed keywords


EID: 84888037889     PISSN: None     EISSN: 21951071     Source Type: Journal    
DOI: 10.1002/adom.201300150     Document Type: Article
Times cited : (58)

References (60)
  • 13
    • 84888027500 scopus 로고    scopus 로고
    • 3 Heterostructures, PHD Dissertation, 2009, Augsburg.
    • 3 Heterostructures, PHD Dissertation, 2009, Augsburg.
    • Thiel, S.P.1
  • 14
    • 84888039470 scopus 로고    scopus 로고
    • Interface Engineering for Oxide Electronics: Tuning electronic properties by atomically controlled growth, Ph.D. Thesis, 2006, University of Twente, Enschede, The Netherlands.
    • M. Huijben, Interface Engineering for Oxide Electronics: Tuning electronic properties by atomically controlled growth, Ph.D. Thesis, 2006, University of Twente, Enschede, The Netherlands.
    • Huijben, M.1
  • 20
    • 84888070368 scopus 로고    scopus 로고
    • The direct gap of STO, i.e., the typical threshold for optical interband transitions, is instead 3.75 eV.
    • The direct gap of STO, i.e., the typical threshold for optical interband transitions, is instead 3.75 eV.
  • 35
    • 84888055718 scopus 로고    scopus 로고
    • Measurements were performed on unpatterned samples. We placed transverse Hall contacts perpendicular to the current flow direction and extracted the part of the signal odd in H. Furthermore, we carried out an electrostatic simulation of our exact contact geometry using the COMSOL software and verified that our Hall voltage was not appreciably affected by geometrical errors.
    • Measurements were performed on unpatterned samples. We placed transverse Hall contacts perpendicular to the current flow direction and extracted the part of the signal odd in H. Furthermore, we carried out an electrostatic simulation of our exact contact geometry using the COMSOL software and verified that our Hall voltage was not appreciably affected by geometrical errors.
  • 41
    • 84888017417 scopus 로고    scopus 로고
    • A more accurate analysis of the first tens of seconds would suggest a convolution of two or more short time constants. We don't investigate this aspect in the present work for a number of reasons: i) working with a continuous Hg lamp we are not able to investigate properly the shortest timescales; ii) adding extra free parameters would lessen the significance of our fits; iii) the focus of this investigation lies elsewhere, and precisely in the comparison with irradiation from visible light, where the short time component vanishes.
    • A more accurate analysis of the first tens of seconds would suggest a convolution of two or more short time constants. We don't investigate this aspect in the present work for a number of reasons: i) working with a continuous Hg lamp we are not able to investigate properly the shortest timescales; ii) adding extra free parameters would lessen the significance of our fits; iii) the focus of this investigation lies elsewhere, and precisely in the comparison with irradiation from visible light, where the short time component vanishes.
  • 50
    • 84888043729 scopus 로고    scopus 로고
    • While the decay dynamics measured after light irradiaton probes more directly the different kind of metastable excitations, the dynamics under irradiation by different lights are more difficult to compare, as being directly affected by the specific relevant parameters (fluence, wavelength, absorption coefficients at given wavelentgth) of the different radiations that are acting on the sample during the measurements.
    • While the decay dynamics measured after light irradiaton probes more directly the different kind of metastable excitations, the dynamics under irradiation by different lights are more difficult to compare, as being directly affected by the specific relevant parameters (fluence, wavelength, absorption coefficients at given wavelentgth) of the different radiations that are acting on the sample during the measurements.
  • 51
    • 79960619142 scopus 로고    scopus 로고
    • M. Stengel, Phys. Rev. B 2011, 106, 136803-136807.
    • (2011) Phys. Rev. B , vol.106 , pp. 136803-136807
    • Stengel, M.1
  • 57
    • 84888052336 scopus 로고    scopus 로고
    • In ref 33 a narrow bandgap polar layer able to absorb directly a fractions of the solar light is considered. Electron-hole couples are then separated by the electric field. In our case, the polar layers are transparent in the visible region. The absorption mechanism we propose is a low-cross-section process directly generating separated electron-hole couples.
    • In ref 33 a narrow bandgap polar layer able to absorb directly a fractions of the solar light is considered. Electron-hole couples are then separated by the electric field. In our case, the polar layers are transparent in the visible region. The absorption mechanism we propose is a low-cross-section process directly generating separated electron-hole couples.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.