Highly Passivated n-Type Colloidal Quantum Dots for Solution-Processed Thermoelectric Generators with Large Output Voltage
Type
ArticleAuthors
Nugraha, Mohamad I.Kim, Hyunho
Sun, Bin
Desai, Saheena
de Arquer, F. Pelayo Garcia
Sargent, Edward H.
Alshareef, Husam N.

Baran, Derya

KAUST Department
Functional Nanomaterials and Devices Research GroupKAUST Solar Center
KAUST Solar Center (KSC)
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
KAUST Grant Number
OSR-CRG2018-3737Date
2019-06-26Embargo End Date
2020-06-26Permanent link to this record
http://hdl.handle.net/10754/656057
Metadata
Show full item recordAbstract
Colloidal 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.Citation
Nugraha, 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.201901244Sponsors
The 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.Publisher
WileyJournal
Advanced Energy MaterialsAdditional Links
http://doi.wiley.com/10.1002/aenm.201901244ae974a485f413a2113503eed53cd6c53
10.1002/aenm.201901244