Bandgap Tuning by Using a Lattice Distortion Induced by Two Symmetries That Coexist in a Quantum Dot
SCIE
SCOPUS
- Title
- Bandgap Tuning by Using a Lattice Distortion Induced by Two Symmetries That Coexist in a Quantum Dot
- Authors
- Eui-Hyun Kong; Yong-June Chang; Hyun-Jin Park; Jang, HM
- Date Issued
- 2014-04
- Publisher
- Wiley
- Abstract
- Among the interests in the application of quantum dots (QDs), the bandgap tuning is of key importance in controlling their material properties. The bandgap of a QD can be adjusted by adopting a variety of different physicochemical methods. Herein, a novel way of the bandgap tuning is developed in an Ag2S-based QD system by suitably quenching the transformation from monoclinic Ag2S to cubic Ag and by subsequently inducing a lattice-distorted region of approximate to 1-nm-scale in a QD. The two distinct crystalline phases of Ag2S and Ag coexisting with the lattice-distorted region are experimentally demonstrated by visually showing this remarkable coexistence in a QD. A new approach is presented to the bandgap tuning (2.51 to 1.64 eV) and enhancing optical properties by suitably tailoring the degree of the lattice-distorted region in a QD. This conceptual method could pave a new way to utilizing quantum effects in various QD applications.
- Keywords
- quantum dots; bandgap tuning; lattice distortions; silver sulfide; photovoltaics; SENSITIZED SOLAR-CELLS; ION CONDUCTOR BETA-AG2S; REVERSE-MICELLE METHOD; SILVER CHALCOGENIDES; TIO2; CDS; NANOCRYSTALS; AG2S; PHOTOLUMINESCENCE; PHOTOELECTRODES
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/14615
- DOI
- 10.1002/SMLL.201303040
- ISSN
- 1613-6810
- Article Type
- Article
- Citation
- Small, vol. 10, no. 7, page. 1300 - 1307, 2014-04
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