AuthorsFan, James Z.
Pina, Joao M.
Sagar, Laxmi Kishore
Proppe, Andrew H.
Rasouli, Armin Sedighian
García de Arquer, F Pelayo
KAUST DepartmentPhysical Science and Engineering (PSE) Division
Material Science and Engineering Program
KAUST Solar Center (KSC)
KAUST Grant NumberCRG2018-3737.
Online Publication Date2020-06-16
Print Publication Date2020-07-08
Embargo End Date2021-06-16
Permanent link to this recordhttp://hdl.handle.net/10754/663783
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AbstractShortwave infrared colloidal quantum dots (SWIRCQDs) are semiconductors capable of harvesting across the AM1.5G solar spectrum. Today’s SWIR-CQD solar cells rely on spin-coating; however, these films exhibit cracking once thickness exceeds ∼500 nm. We posited that a blade-coating strategy could enable thick QD films. We developed a ligand exchange with an additional resolvation step that enabled the dispersion of SWIRCQDs. We then engineered a quaternary ink that combined highviscosity solvents with short QD stabilizing ligands. This ink, bladecoated over a mild heating bed, formed micron-thick SWIR-CQD films. These SWIR-CQD solar cells achieved short-circuit current densities (Jsc) that reach 39 mA cm−2 , corresponding to the harvest of 60% of total photons incident under AM1.5G illumination. External quantum efficiency measurements reveal both the first exciton peak and the closest Fabry−Perot resonance peak reaching approximately 80%this is the highest unbiased EQE reported beyond 1400 nm in a solution-processed semiconductor.
CitationFan, J. Z., Vafaie, M., Bertens, K., Sytnyk, M., Pina, J. M., Sagar, L. K., … Sargent, E. H. (2020). Micron Thick Colloidal Quantum Dot Solids. Nano Letters. doi:10.1021/acs.nanolett.0c01614
SponsorsThe authors thank L. Levina, E. Palmiano, R. Wolowiec, and D. Kopilovic for their assistance during the period of study. The authors also thank the members of QD Solar for their assistance and discussions during the period of study: V. Tran, T. Vo, T. Gibbs, M. Labine, A. MacDonald, E. Mosaferi, R. Quintero-Bermudez, and A. Fisher.
This work was supported by Ontario Research Fund-Research Excellence program (ORF7 ministry of Research and Innovation, Ontario Research Fund-Research Excellence Round 7) and by the Natural Sciences and Engineering Research Council (NSERC) of Canada in the form of Alexander Graham Bell Canada Graduate Scholarships (CGS-D), Materials for Enhanced Energy Technologies (MEET) scholarships, and the NSERC Collaborative Research and Training Experience (CREATE) Program Grant Number 466083. The authors acknowledge financial support from QD Solar. This publication is also based upon work supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No. OSR-CRG2018-3737.
PublisherAmerican Chemical Society (ACS)