Journal article
Low-Temperature-Processed Colloidal Quantum Dots as Building Blocks for Thermoelectrics
Advanced energy materials, v 9(13), 1803049
04 Apr 2019
Abstract
Colloidal quantum dots (CQDs) are demonstrated to be promising materials to realize high-performance thermoelectrics owing to their low thermal conductivity. The most studied CQD films, however, are using long ligands that require high processing and operation temperature (>400 degrees C) to achieve optimum thermoelectric performance. Here the thermoelectric properties of CQD films cross-linked using short ligands that allow strong inter-QD coupling are reported. Using the ligands, p-type thermoelectric solids are demonstrated with a high Seebeck coefficient and power factor of 400 mu V K-1 and 30 mu W m(-1) K-2, respectively, leading to maximum ZT of 0.02 at a lower measurement temperature (<400 K) and lower processing temperature (<300 degrees C). These ligands further reduce the annealing temperature to 175 degrees C, significantly increasing the Seebeck coefficient of the CQD films to 580 V K-1. This high Seebeck coefficient with a superior ZT near room temperature compared to previously reported high temperature-annealed CQD films is ascribed to the smaller grain size, which enables the retainment of quantum confinement and significantly increases the hole effective mass in the films. This study provides a pathway to approach quantum confinement for achieving a high Seebeck coefficient yet strong inter-QD coupling, which offers a step toward low-temperature-processed high-performance thermoelectric generators.
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Details
- Title
- Low-Temperature-Processed Colloidal Quantum Dots as Building Blocks for Thermoelectrics
- Creators
- Mohamad I. Nugraha - King Abdullah University of Science and TechnologyHyunho Kim - King Abdullah University of Science and TechnologyBin Sun - University of TorontoMd Azimul Haque - King Abdullah University of Science and TechnologyFrancisco Pelayo Garcia de Arquer - University of TorontoDiego Rosas Villalva - King Abdullah University of Science and TechnologyAbdulrahman El-Labban - KAUST, Phys Sci & Engn Div PSE, KSC, Thuwal 239556900, Saudi ArabiaEdward H. Sargent - University of TorontoHusam N. Alshareef - King Abdullah University of Science and TechnologyDerya Baran - King Abdullah University of Science and Technology
- Publication Details
- Advanced energy materials, v 9(13), 1803049
- Publisher
- Wiley
- Number of pages
- 7
- Grant note
- KAUST Solar Center Competitive Fund (CCF) Competitive Research Grant (CRG)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000467131300004
- Scopus ID
- 2-s2.0-85061614137
- Other Identifier
- 991022059920804721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Physical
- Energy & Fuels
- Materials Science, Multidisciplinary
- Physics, Applied
- Physics, Condensed Matter