High-Efficiency Colloidal Quantum Dot Photovoltaics via Robust Self-Assembled Monolayers
García de Arquer, F. Pelayo
Yoon, Yung Jin
Ip, Alexander H.
Kim, Jin Young
Sargent, Edward H.
KAUST Grant NumberKUS-11-009-21
Online Publication Date2015-11-02
Print Publication Date2015-11-11
Permanent link to this recordhttp://hdl.handle.net/10754/598487
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Abstract© 2015 American Chemical Society. The optoelectronic tunability offered by colloidal quantum dots (CQDs) is attractive for photovoltaic applications but demands proper band alignment at electrodes for efficient charge extraction at minimal cost to voltage. With this goal in mind, self-assembled monolayers (SAMs) can be used to modify interface energy levels locally. However, to be effective SAMs must be made robust to treatment using the various solvents and ligands required for to fabricate high quality CQD solids. We report robust self-assembled monolayers (R-SAMs) that enable us to increase the efficiency of CQD photovoltaics. Only by developing a process for secure anchoring of aromatic SAMs, aided by deposition of the SAMs in a water-free deposition environment, were we able to provide an interface modification that was robust against the ensuing chemical treatments needed in the fabrication of CQD solids. The energy alignment at the rectifying interface was tailored by tuning the R-SAM for optimal alignment relative to the CQD quantum-confined electron energy levels. This resulted in a CQD PV record power conversion efficiency (PCE) of 10.7% with enhanced reproducibility relative to controls.
CitationKim G-H, García de Arquer FP, Yoon YJ, Lan X, Liu M, et al. (2015) High-Efficiency Colloidal Quantum Dot Photovoltaics via Robust Self-Assembled Monolayers. Nano Lett 15: 7691–7696. Available: http://dx.doi.org/10.1021/acs.nanolett.5b03677.
SponsorsThis publication is based in part on work supported by Award KUS-11-009-21, made by 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). We thank Emre Yassitepe and Cao-Thang Dinh for helpful discussions. We also thank E. Palmiano, L. Levina, A. Labelle, R. Wolowiec, and D. Kopilovic for their help over the course of this study.
PublisherAmerican Chemical Society (ACS)