Highly Passivated n-Type Colloidal Quantum Dots for Solution-Processed Thermoelectric Generators with Large Output Voltage

Mohamad I. Nugraha, Hyunho Kim, Bin Sun, Saheena Desai, F. Pelayo Garcia de Arquer, Edward H. Sargent, Husam N. Alshareef, Derya Baran

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

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 (
Original languageEnglish (US)
Pages (from-to)1901244
JournalAdvanced Energy Materials
Volume9
Issue number28
DOIs
StatePublished - Jun 26 2019

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