Research ArticleMATERIALS SCIENCE

Direct observation of shift and ballistic photovoltaic currents

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Science Advances  11 Jan 2019:
Vol. 5, no. 1, eaau5588
DOI: 10.1126/sciadv.aau5588
  • Fig. 1 Experimental scheme for probing bulk photovoltaic current in the extrinsic spectral.

    (A) Schematic illustration of the sample geometry and electrode and field configuration. (B) Block diagram illustrating experimental configuration. (1) Bi12GeO20 crystal, (2) lock-in amplifier, (3) modulator driving electronics, (4) function generator, (5) Kr/Ar ion laser, (6) polarizer, (7) electromagnet, (8) electro-optic modulator, (9) λ/2 or λ/4 achromatic wave plate, and (10) Hall contacts. (C) Measured optical absorption in Bi12GeO20.

  • Fig. 2 Bulk photovoltaic currents under linearly and circularly polarized illumination in Bi12GeO20, and the corresponding Hall component.

    (A) Measured variation in photocurrent jl, in Bi12GeO20, under linearly polarized λ = 488.1 nm light, as a function of β, the angle between the light polarization and [010]. (B) Measured spectral dependences of linear jl and circular jc photovoltaic currents, normalized to incident power. (C) Hall component of the circular photovoltaic current Embedded Image as a function of magnetic field, for right (σ+) and left (σ) circularly polarized λ = 488.1 nm light.

  • Fig. 3 Separation of shift and ballistic contributions to the bulk photovoltaic current.

    (A) Spectral dependences of shift js and ballistic jb photovoltaic currents, each normalized to incident power. (B) Corresponding spectral shift and ballistic Glass coefficients. (C) Spectral dependence of the nonthermalized carrier mobility in Bi12GeO20.

Supplementary Materials

  • Supplementary material for this article is available at http://advances.sciencemag.org/cgi/content/full/5/1/eaau5588/DC1

    Symmetry considerations for separation of ballistic and shift photovoltaic currents

    Fig. S1. Experimental separation of shift and ballistic contributions to the bulk photovoltaic current in the extrinsic regime in Bi12SiO20.

  • Supplementary Materials

    This PDF file includes:

    • Symmetry considerations for separation of ballistic and shift photovoltaic currents
    • Fig. S1. Experimental separation of shift and ballistic contributions to the bulk photovoltaic current in the extrinsic regime in Bi12SiO20.

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