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Carrier tunneling and device characteristics in polymer light-emitting diodes
Abstract
In this paper it is demonstrated that the characteristics of light-emitting diodes based upon MEH-PPV [more fully known as poly(2-methoxy,5-(2′-ethyl-hexoxy)-1,4-phenylene- vinylene)] are determined by tunneling of both the holes and the electrons through interface barriers caused by the band offset between the polymer and the electrodes. It is shown that manipulating these offsets can control the useful operating voltage of the device as well as its efficiency. A model is developed that clearly explains the device characteristics of a wide range of diodes based upon MEH-PPV. The turn-on voltage for an ideal device is shown to be equal to the band gap, i.e., 2.1 eV for MEH-PPV, and is slightly lower at 1.8 eV for an indium-tin oxide/MEH-PPV/Ca device. If there is a significant difference in the barrier height, the smaller of the two barriers controls the I–V characteristics, while the larger barrier determines the device efficiency. In indium-tin-oxide/MEH-PPV/Ca devices, the barrier to hole injection is 0.2 eV and the barrier to electron injection is only 0.1 eV. This combination of electrodes is close to optimal for MEH-PPV, but lowering the hole barrier can still lead to a doubling of the device efficiency.
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Citations
Cited by
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Li, G., Chu, C.-W., Shrotriya, V., Huang, J., & Yang, Y. (2006) · Applied Physics Letters · doi:10.1063/1.2212270 · Cited by 788
Electrical characteristics and efficiency of single-layer organic light-emitting diodes
Malliaras, G. G., Salem, J. R., Brock, P. J., & Scott, C. (1998) · Physical Review B · doi:10.1103/physrevb.58.r13411 · Cited by 663
Polymer Photovoltaic Cells Based on Solution‐Processable Graphene and P3HT
Liu, Q., Liu, Z., Zhang, X., Yang, L., Zhang, N., Pan, G., Yin, S., Chen, Y., & Wei, J. (2009) · Advanced Functional Materials · doi:10.1002/adfm.200800954 · Cited by 494
Metadata
- Authors
- Parker, I. D.
- Venue
- Journal of Applied Physics
- Publisher
- AIP Publishing
- Published
- 1994-02-01
- Volume
- 75
- Issue
- 3
- Pages
- 1656-1666
- ISSN
- 0021-8979 (ISSN-L)
- 1089-7550
- OpenAlex
- W2021878030
- Cited by
- 1,523
- References
- 0
- FWCI
- 105.41
- Type
- journal article
- Language
- en
- Open access
- closed
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- Parker, I. D. (1994). Carrier tunneling and device characteristics in polymer light-emitting diodes. Journal of Applied Physics. https://doi.org/10.1063/1.356350
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Bibliographic data: Semantic Scholar, OpenAlex, Crossref.
Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
