A hybrid lead iodide perovskite and lead sulfide QD heterojunction solar cell to obtain a panchromatic response

Lioz Etgar*, Peng Gao, Peng Qin, Michael Graetzel, Mohammad Khaja Nazeeruddin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

77 Scopus citations

Abstract

We report for the first time on co-sensitization between CH 3NH3PbI3 perovskite and PbS quantum dots (QDs) in a heterojunction solar cell to obtain a panchromatic response from the visible to near IR regions. Following the deposition of the sensitizers on a TiO2 film, an Au thin layer is evaporated on top as a back contact. Importantly, the CH3NH3PbI3 nanoparticles and the PbS QDs used here simultaneously play both the role of a light harvester and a hole conductor, rendering superfluous the use of an additional hole transporting material. The mesoscopic CH3NH3PbI 3 (perovskite)-PbS (QD)/TiO2 heterojunction solar cell shows an impressive short circuit photocurrent (Jsc) of 24.63 mA cm-2, much higher than those of the individual CH3NH 3PbI3 perovskite and the PbS QD solar cells. The advent of such co-sensitization mesoscopic heterojunction solar cells paves the way to extend the absorbance region of the promising low cost, high-efficiency perovskite based solar cells. This journal is

Original languageAmerican English
Pages (from-to)11586-11590
Number of pages5
JournalJournal of Materials Chemistry A
Volume2
Issue number30
DOIs
StatePublished - 14 Aug 2014

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