Affiliation:
1. Department of Electrical and Computer Engineering University of Toronto 10 King's College Road Toronto Ontario M5S 3G4 Canada
2. Department of Chemistry Korea University Seoul 02841 Republic of Korea
3. Department of Materials Science and Engineering University of Toronto 184 College Street Toronto Ontario M5S 3E4 Canada
4. Department of Chemistry University of Toronto 80 St. George Street Toronto Ontario M5S 3H6 Canada
Abstract
AbstractIn the III–V family of colloidal quantum dot (CQD) semiconductors, InSb promises access to a wider range of infrared wavelengths compared to many light‐sensing material candidates. However, achieving the necessary size, size‐dispersity, and optical properties has been challenging. Here the synthetic challenges associated with InSb CQDs are investigated and it is found that uncontrolled reduction of the antimony precursor hampers the controlled growth of CQDs. To overcome this, a synthetic strategy that combines nonpyrophoric precursors with zinc halide additives is developed. The experimental and computational studies show that zinc halide additives decelerate the reduction of the antimony precursor, facilitating the growth of more uniformly sized CQDs. It is also found that the halide choice provides additional control over the strength of this effect. The resultant CQDs exhibit well‐defined excitonic transitions in spectral range of 1.26–0.98 eV, along with strong photoluminescence. By implementing a postsynthesis ligand exchange, colloidally stable inks enabling the fabrication of high‐quality CQD films are achieved. The first demonstration of InSb CQD photodetectors is presented reaching 75% external quantum efficiency (QE) at 1200 nm, to the knowledge the highest short‐wave infrared (SWIR) QE reported among heavy‐metal‐free infrared CQD‐based devices.
Funder
Natural Sciences and Engineering Research Council of Canada
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
2 articles.
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