Highly Passivated n-Type Colloidal Quantum Dots for Solution-Processed Thermoelectric Generators with Large Output Voltage
AuthorsNugraha, Mohamad I.
de Arquer, F. Pelayo Garcia
Sargent, Edward H.
Alshareef, Husam N.
KAUST DepartmentFunctional Nanomaterials and Devices Research Group
KAUST Solar Center
KAUST Solar Center (KSC)
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
KAUST Grant NumberOSR-CRG2018-3737
Embargo End Date2020-06-26
Permanent link to this recordhttp://hdl.handle.net/10754/656057
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AbstractColloidal quantum dots (CQDs) are attractive materials for thermoelectric applications due to their simple and low-cost processing; advantageously, they also offer low thermal conductivity and high Seebeck coefficient. To date, the majority of CQD thermoelectric films reported upon have been p-type, while only a few reports are available on n-type films. High-performing n- and p-type films are essential for thermoelectric generators (TEGs) with large output voltage and power. Here, high-thermoelectric-performance n-type CQD films are reported and showcased in high-performance all-CQD TEGs. By engineering the electronic coupling in the films, a thorough removal of insulating ligands is achieved and this is combined with excellent surface trap passivation. This enables a high thermoelectric power factor of 24 µW m−1 K−2, superior to previously reported n-type lead chalcogenide CQD films operating near room temperature (<1 µW m−1 K−2). As a result, an all-CQD film TEG with a large output voltage of 0.25 V and a power density of 0.63 W m−2 at ∆T = 50 K is demonstrated, which represents an over fourfold enhancement to previously reported p-type only CQD TEGs.
CitationNugraha, M. I., Kim, H., Sun, B., Desai, S., de Arquer, F. P. G., Sargent, E. H., … Baran, D. (2019). Highly Passivated n-Type Colloidal Quantum Dots for Solution-Processed Thermoelectric Generators with Large Output Voltage. Advanced Energy Materials, 9(28), 1901244. doi:10.1002/aenm.201901244
SponsorsThe authors would like to acknowledge Xinwei Guan for supporting XRD measurement. Figures 1a and 6a were created by Heno Hwang, a scientific illustrator at King Abdullah University of Science and Technology (KAUST). This publication is 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.
JournalAdvanced Energy Materials