Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)
Publication date: 5th February 2015
Blends 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, PBT1, PTB7) with higher LUMO than the conduction band of the QDs has been chosen as electron donor material. The position of the HOMO of these polymers seems to affect the performance of the blends by limiting the possibilities of hole transfer. 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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