Self-heating, bistability, and thermal switching in organic semiconductors
- Fischer, Axel
- Pahner, Paul
- Lüssem, Björn
- Leo, Karl
- Scholz, Reinhard
- Koprucki, Thomas
- Gärtner, Klaus
- Glitzky, Annegret
2010 Mathematics Subject Classification
- 82D37 80A20 34C55
2008 Physics and Astronomy Classification Scheme
- 81.05.Fb, 73.61.Wp, 72.80.Le
- Organic semiconductor, C60, Joule self-heating, S-shaped negative differential resistance (SNDR), thermal switching, bistability, hysteresis, Arrhenius-like conductivity law
We demonstrate electric bistability induced by the positive feedback of self-heating onto the thermally activated conductivity in a two-terminal device based on the organic semiconductor C60. The central undoped layer with a thickness of 200 nm is embedded between thinner n-doped layers adjacent to the contacts minimizing injection barriers. The observed current-voltage characteristics follow the general theory for thermistors described by an Arrhenius-like conductivity law. Our findings including hysteresis phenomena are of general relevance for the entire material class since most organic semiconductors can be described by a thermally activated conductivity.
- Phys. Rev. Lett., 110 (2013) pp. 126601/1--126601/5.