期刊
CHEMICAL PHYSICS
卷 357, 期 1-3, 页码 21-27出版社
ELSEVIER
DOI: 10.1016/j.chemphys.2008.07.026
关键词
Conjugated polymer; Charge carrier injection; Charge trapping; Nanoparticles; Fluorescence; Organic electronics; Single molecules studies
资金
- Department of Energy
- Basic Energy Sciences
- National Science Foundation
- Welch Foundation
- Air Force Office of Scientific Research
- Marie Curie OIF
The hole injection from a carbazole derivative hole transport layer into nanoparticles (r = 25 +/- 15 nm) of the conjugated polymer MEH-PPV was investigated by an indirect single-particle fluorescence-quenching technique. The results Suggest that there is a kinetic barrier for hole injection that prevents polymer particles from being charged in the dark. This barrier can be overcome with the assistance of optical excitation of the MEH-PPV nanoparticles, achieving a thermodynamic population of injected holes at positive bias. The amount of injected holes at equilibrium is observed to depend upon the bias in a manner highly consistent with device simulations based on a continuum model. Overall, the results demonstrate that the hole injection into nano domains of conjugated polymers is a complex process depending upon molecular interfacial effects determined by device geometry and electrostatic interactions. (C) 2008 Elsevier B.V. All rights reserved.
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