Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 13, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202115389
Keywords
carrier and exciton migration; electrochemical deposition; organic single crystal; orientation control; thin films
Categories
Funding
- National Natural Science Foundation of China [21975078, 51521002]
- Guangdong Basic and Applied Basic Research Foundation [2021A1515010311]
- Natural Science Foundation of Guangdong Province [2019B030301003]
- 111 Project
- Thousand Youth Talents Plan
- China Scholarship Council [202006155049]
- Gutenberg Research College
- Chinese Academy of Sciences [ZDBS-LY-JSC027, XDB30000000]
- Projekt DEAL
- Max Planck Society
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Electrochemical deposition is an efficient technique for preparing conjugated polymer films on electrodes, allowing control over film thickness, crystal size, and crystal orientation. The films produced by this method have a unique crystal structure and exhibit exceptional carrier and exciton migration.
Electrochemical deposition has emerged as an efficient technique for preparing conjugated polymer films on electrodes. However, this method encounters difficulties in synthesizing crystalline products and controlling their orientation on electrodes. Here we report electrochemical film deposition of a large polycyclic aromatic hydrocarbon. The film is composed of single-crystalline nanorods, in which the molecules adopt a cofacial stacking arrangement along the pi-pi direction. Film thickness and crystal size can be controlled by electrochemical conditions such as scan rate and electrolyte species, while the choice of anode material determines crystal orientation. The film supports exceptionally efficient migration of both free carriers and excitons: the free carrier mobility reaches over 30 cm(2) V-1 s(-1), whereas the excitons are delocalized with a low binding energy of 118.5 meV and a remarkable exciton diffusion length of 45 nm.
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