Can True Space-Charge-Limited Currents be Observed in (pi-symbol)-Conjugated Polymers
Journal Article
·
· Journal of Applied Physics
The observation of space-charge-limited (SCL) currents in hole conductors requires that the hole density injected at the electrode, p{sub inj}, overwhelm the bulk free hole density p{sub f}. It also requires that any mobile ion density n{sub ion} be insignificant. SCL currents are often claimed in amorphous films of {pi}-conjugated polymers. However, we estimate p{sub f} in poly(p-phenylene-vinylene) derivatives from the conductivities and carrier mobilities as 10{sup 17}-10{sup 19} cm{sup -3} and show that even if n{sub ion} = 0, the currents in {pi}-conjugated polymers are often better described as Poole-Frenkel (PF) currents. When n{sub ion} > 0, even the PF model is an oversimplification.
- Research Organization:
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC36-08GO28308
- OSTI ID:
- 976973
- Journal Information:
- Journal of Applied Physics, Vol. 99, Issue 11, 2006; Related Information: Article No. 116104; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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