Thin film photovoltaic cell structure, nanoantenna, and method for manufacturing

摘要

A thin film photovoltaic cell structure (1) comprises a substrate (2); a first dielectric layer (3) on the substrate (2); an active layer (4) on the first dielectric layer (3); and a plasmonic light concentrator arrangement (5) on the active layer (4) for coupling incident light at a first wavelength band into the active layer (4). According to the present invention, the thin film photovoltaic cell structure (1) further comprises a second dielectric layer (6) formed of a dielectric material which is transparent at the first wavelength band and at a second wavelength band on the plasmonic light concentrator arrangement (5); the first dielectric layer (3), the active layer (4), the plasmonic light concentrator arrangement (5), and the second dielectric layer (6) being configured to form a resonant cavity for coupling incident light at the second wavelength band into a standing wave confined in the resonant cavity.

主权项

1. A thin film photovoltaic cell structure comprising:
a substrate; a first dielectric layer on the substrate; an active layer on the first dielectric layer; and a plasmonic light concentrator arrangement on the active layer for coupling incident light at a first wavelength band into the active layer; the thin film photovoltaic cell structure further comprising a second dielectric layer formed of a material which is transparent at the first wavelength band and at a second wavelength band on the plasmonic light concentrator arrangement; the first dielectric layer, the active layer, the plasmonic light concentrator arrangement, and the second dielectric layer being configured to form a resonant cavity for coupling incident light at the second wavelength band into a standing wave confined in the resonant cavity; characterized in that the plasmonic light concentrator arrangement comprises a nanoantenna for concentrating the incident light at the first wavelength band into a spot extending into the active layer, the spot being created due to excitation of the eigenmodes of the antenna unit; wherein the nanoantenna comprises a unit cell comprising two pairs of first sub-wavelength metal patches placed around a central gap separate from each other, the two first patches of each pair lying on opposite sides of the central gap centrally located on a straight connection line crossing the central gap, the connection lines of the two pairs of first sub-wavelength metal patches being directed substantially perpendicularly to each other.