A numerical study into the influence of quantum dot size on the sub-bandgap interband photocurrent in intermediate band solar cells | Zendy

A. Mellor | Zendy; A. Ĺuque | Zendy; I. Tobı́as | Zendy; Antonio Martı́ | Zendy

Open Access

A numerical study into the influence of quantum dot size on the sub-bandgap interband photocurrent in intermediate band solar cells

Author(s) -

A. Mellor,

A. Ĺuque,

I. Tobı́as,

Antonio Martı́

Publication year - 2013

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4792598

Subject(s) - photocurrent , multiple exciton generation , band gap , quantum dot , solar cell , semimetal , direct and indirect band gaps , optoelectronics , condensed matter physics , molecular physics , materials science , physics

A numerical study is presented of the sub-bandgap interband photon absorption in quantum dot intermediate band solar cells. Absorption coefficients and photocurrent densities are calculated for the valence band to intermediate band transitions using a four-band k·p method. It is found that reducing the quantum dot width in the plane perpendicular to the growth direction increases the photocurrent from the valence band to the intermediate-band ground state if the fractional surface coverage of quantum dots is conserved. This provides a path to increase the sub-bandgap photocurrent in intermediate band solar cells

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