Dopant-Assisted Matrix Stabilization Enables Thermoelectric Performance Enhancement in n-Type Quantum Dot Films.
Type
ArticleAuthors
Nugraha, Mohamad Insan
Sun, Bin

Kim, Hyunho

El Labban, Abdulrahman

Desai, Saheena
Chaturvedi, Neha

Hou, Yi
García de Arquer, F Pelayo

Alshareef, Husam N.

Sargent, E.

Baran, Derya

KAUST Department
Biological and Environmental Science and Engineering (BESE) DivisionFunctional Nanomaterials and Devices Research Group
KAUST Solar Center (KSC)
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
KAUST Grant Number
CRG2018-3737.Date
2021-04-15Online Publication Date
2021-04-15Print Publication Date
2021-04-28Embargo End Date
2022-04-15Submitted Date
2021-01-28Permanent link to this record
http://hdl.handle.net/10754/668824
Metadata
Show full item recordAbstract
Efficient thermoelectric generators require further progress in developing n-type semiconductors that combine low thermal conductivity with high electrical conductivity. By embedding colloidal quantum dots (CQDs) in a metal halide matrix (QDMH), the metal halide matrix can enhance phonon scattering, thus suppressing thermal transport; however, simultaneously achieving high electrical conductivity in such systems has previously been limited by the deleterious impact of a large density of interfaces on charge transport. Therefore, new strategies are needed to improve charge carrier transport without sacrificing matrix-enabled low thermal transport. Here, we report the use of chemical doping in the solution state to improve electron transport while maintaining low thermal transport in QDMH films. By incorporating cesium carbonate (Cs2CO3) salts as a dopant prior to matrix formation, we find that the dopant stabilizes the matrix in colloidal inks and enables efficient n-type doping in QDMH films. As a result, this strategy leads to an enhanced n-type thermoelectric behavior in solution-processed QDMH films near room temperature, with a thermal conductivity of 0.25 W m–1 K–1—significantly lower than in prior films based on organic-ligand-cross-linked CQD films (>0.6 W m–1 K–1) and spark-plasma-sintered CQD systems (>1 W m–1 K–1). This study provides a pathway to developing efficient n-type thermoelectric materials with low thermal conductivity using single-step deposition and low-temperature processing.Citation
Nugraha, M. I., Sun, B., Kim, H., El-Labban, A., Desai, S., Chaturvedi, N., … Baran, D. (2021). Dopant-Assisted Matrix Stabilization Enables Thermoelectric Performance Enhancement in n-Type Quantum Dot Films. ACS Applied Materials & Interfaces. doi:10.1021/acsami.1c01886Sponsors
The authors would like to acknowledge Nimer Wehbe at KAUST Core Labs for supporting XPS measurements in this work. Research in this publication was supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award no. OSRCRG2018-3737.Publisher
American Chemical Society (ACS)PubMed ID
33856780Additional Links
https://pubs.acs.org/doi/10.1021/acsami.1c01886ae974a485f413a2113503eed53cd6c53
10.1021/acsami.1c01886
Scopus Count
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