PN tandem solar cells show very poor performance for lacking of ideal p-type semiconductors and efficient “p-type” sensitizers. Organometal halide perovskites are attractive light absorbers owning to their direct band gaps, high absorption coefficient and specific bipolar charge transport perperty. In this work, a novel PN tandem solar cell has been developed, by integration of dye sensitized n-type TiO2 photoanode and organometal halide perovskite sensitized p-type NiO photocathode in a sandwich type photoelectrochemical system by sharing the common iodide based liquid electrolyte. The tandem device outperforms either of the two half cells, with a record efficiency of 2.82% among kinds of PN tandem type solar cells. The highest photovoltage of 1030mV and highest photocurrent desnity of 4.30 mA cm−2 have been achieved by varying the thickness of TiO2. The results demonstrate a new approach for the beneficial utilization of the multiple sensitizers, i.e., perovskite and dye, in one photoelectrochemical cell system towards efficient, low cost photovoltaics.

© 2015 Optical Society of America

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