A new concept of photochemical upconversion for thin film silicon solar cells

We consider a scheme to increase the conversion efficiency of a single bandgap solar cell by applying photochemical upconversion UC , i.e. joining two low energy photons together by incoherent means. Photochemical UC makes use of two molecular species; one for absorption of the low energy photons and one for UC via triplet triplet annihilation as well as emission of the higher energy photons. We describe a model wherein we place a experimentally fully characterized UC unit behind a thin a Si H bifacial solar cell. We calculate the relative increase of the photocurrent of the a Si H cell depending on the solar concentrations utilize