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Abstract
We report an external solar power conversion efficiency of ~0.1% in Bi-Mn-O thin films grown onto (111) oriented Niobium doped SrTiO3 (STO) single crystal substrate by pulse laser deposition (PLD). The films contain BiMnO3 (BMO) and Mn3O4 (MO) phases, which both grow epitaxially. The growth conditions were tailored to obtain films with different Bi/Mn ratios. The films were subsequently illuminated under a sun simulator (AM 1.5 G). We find that the Bi/Mn ratio in the film affects the magnitude of the photo induced voltage and photocurrent and therefore the photovoltaic conversion efficiency. Specifically, a higher Bi/Mn ratio (towards unity) in the film increases the power conversion efficiency. This effect is described in terms of a more favorable energy band alignment of the film/substrate hetero-structure junction, which controls photo carrier separation.
Highlights
IntroductionPhotons with energy higher than the band gap of the material are absorbed to create excitons
In photovoltaic devices, photons with energy higher than the band gap of the material are absorbed to create excitons
We report an external solar power conversion efficiency of ~0.1% in Bi-Mn-O thin films grown onto (111) oriented Niobium doped SrTiO3 (STO) single crystal substrate by pulse laser deposition (PLD)
Summary
Photons with energy higher than the band gap of the material are absorbed to create excitons The latter are separated by an internal electric field and collected by the electrodes. The efficiency of charge carrier collection depends on the magnitude of the internal electric field present inside the material. This field usually originates from a p-n homo or hetero-junction [1] that forms depending on the nature of semiconductor material used in the device. In ferroelectric materials, which possess a spontaneous polarization, there is an internal electric field (commonly identified with the depolarization field, EDP) that extends over the whole thin film volume [2,3], thereby separating the charge carriers even more efficiently. The results demonstrate that an increased percentage of BMO phase in the films contributes significantly to the enhancement of the PV efficiency
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