Colloidal Quantum Dot Photovoltaics Enhanced by Perovskite Shelling

Abstract
Solution-processed quantum dots are a promising material for large-scale, low-cost solar cell applications. New device architectures and improved passivation have been instrumental in increasing the performance of quantum dot photovoltaic devices. Here we report photovoltaic devices based on inks of quantum dot on which we grow thin perovskite shells in solid-state films. Passivation using the perovskite was achieved using a facile solution ligand exchange followed by postannealing. The resulting hybrid nanostructure created a more intrinsic CQD film, which, when incorporated into a photovoltaic device with graded bandstructure, achieved a record solar cell performance for single-step-deposited CQD films, exhibiting an AM1.5 solar power conversion efficiency of 8.95%.

Citation
Yang, Z., Janmohamed, A., Lan, X., García de Arquer, F. P., Voznyy, O., Yassitepe, E., … Sargent, E. H. (2015). Colloidal Quantum Dot Photovoltaics Enhanced by Perovskite Shelling. Nano Letters, 15(11), 7539–7543. doi:10.1021/acs.nanolett.5b03271

Acknowledgements
This publication is based in part on supported by Award KUS-11-009-21, from King Abdullah University of Science and Technology (KAUST), by the Ontario Research Fund Research Excellence Program, by the Natural Sciences and Engineering Research Council (NSERC) of Canada, and by the International Cooperation of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Knowledge Economy (2012T100100740). A.J. thanks NSERC for Undergraduate Student Research Award Funding. E.Y. acknowledges support from FAPESP-BEPE fellowship (2014/18327-9). The authors thank E. Palmiano, L. Levina, R. Wolowiec, and D. Kopilovic for helpful discussions.

Publisher
AMER CHEMICAL SOC

Journal
NANO LETTERS

DOI
10.1021/acs.nanolett.5b03271

Additional Links
https://pubs.acs.org/doi/10.1021/acs.nanolett.5b03271

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