Publication date: 27th June 2014
Blends and bilayers of PbS quantum dots (QDs) and different organic materials have been prepared with the aim of systematically studying electron and hole injection into the QDs. A set of polymers (P3HT, PCPDTBT, PBT1) with higher LUMO than the conduction band of the QDs has been chosen as electron donor material. Organic molecules (Spiro-OMe-TAD, C60 fullerene, C60-PCBM) with a HOMO deeper than the valence band of the QDs has been employed as electron acceptor materials. A spectroscopic study, including techniques as UV-vis absorption, photoluminescence, and transient absorption spectroscopy, has been carried out on the samples. The results comprise a first set of data that will be employed for the design of QD sensitized hybrid solar cells.[1] Recently, an PCE of 5.50% has been reported in a bilayer solar cell where the active layer contained PbSxSe1-x QDs and a low band-gap polymer[2], a result that may be improved with the fabrication of blends that provide a higher interface for exciton dissociation.
[1] J. Phys. Chem. Lett. 2014, 5, 348−360, dx.doi.org/10.1021/jz4023656
[2] Adv. Mater. 2013, 25, 5772–5778, DOI: 10.1002/adma.201302340
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