Making Nonconjugated Small-Molecule Organic Radicals Conduct
- Authors
- Yu, Ilhwan; Jo, Yerin; Ko, Jaehyoung; Kim, Dae-Yoon; Sohn, Daewon; Joo, Yongho
- Issue Date
- Jul-2020
- Publisher
- AMER CHEMICAL SOC
- Keywords
- Nonconjugated conductor; stable radical; small-molecule conductor; Single-crystal
- Citation
- NANO LETTERS, v.20, no.7, pp.5376 - 5382
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANO LETTERS
- Volume
- 20
- Number
- 7
- Start Page
- 5376
- End Page
- 5382
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/1852
- DOI
- 10.1021/acs.nanolett.0c01730
- ISSN
- 1530-6984
- Abstract
- Charge neutral, nonconjugated organic radicals have emerged as extremely useful active materials for solid-state electronic applications. This previous achievement confirmed the potential of radical-based macromolecules in organic electronic devices; however, charge transport in radical molecules has not been studied in great detail from a fundamental perspective. Here we demonstrate the charge transport in a nonconjugated organic small radical, 4-hydroxy-2,2,6,6-tetramethylpiperidin-1-oxyl (h-TEMPO). The chemical component of this radical molecule allows us to form a single crystal via physical vapor deposition (PVD). While the charge transport of this macroscopic open-shell single crystal is rather low, thermal annealing of the well-defined single crystal enables the molecule to have a rapid charge transfer reaction due to the electronic communication of open-shell sites with each other, which results in electrical conductivities greater than 0.05 S m–1. This effort demonstrates a drastically different model than the commonly accepted conjugated polymers or molecules for the creation of next-generation conductors.
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