Author:
Schulze Tim F.,Cheng Yuen Yap,Fückel Burkhard,MacQueen Rowan W.,Danos Andrew,Davis Nathaniel J. L. K.,Tayebjee Murad J. Y.,Khoury Tony,Clady Raphaël G. C. R.,Ekins-Daukes N. J.,Crossley Maxwell J.,Stannowski Bernd,Lips Klaus,Schmidt Timothy W.
Abstract
Photochemical upconversion is applied to a hydrogenated amorphous silicon solar cell in the presence of a back-scattering layer. A custom-synthesized porphyrin was utilized as the sensitizer species, with rubrene as the emitter. Under a bias of 24 suns, a peak external quantum efficiency (EQE) enhancement of ~2 % was observed at a wavelength of 720 nm. Without the scattering layer, the EQE enhancement was half this value, indicating that the effect of the back-scatterer is to double the efficacy of the upconverting device. The results represent an upconversion figure of merit of 3.5 × 10–4 mA cm–2 sun–2, which is the highest reported to date.
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