Photovoltaic measurement of the built-in potential in organic light emitting diodes and photodiodes
- 1 August 1998
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 84 (3), 1583-1587
- https://doi.org/10.1063/1.368227
Abstract
We measure the voltage at which the current under illumination in poly[2-methoxy, 5-(2-ethylhexoxy)-1,4-phenylene vinylene] based light emitting diodes is equal to the dark current. At low temperatures, this voltage, which we term the “compensation” voltage, is found to be equal to the built-in potential, as measured with electroabsorption on the same diode. Diffusion of thermally injected charges at room temperature, however, shifts the compensation voltage to lower values. A model explaining this behavior is developed and its implications for the operation of organic light emitting diodes and photovoltaic cells are briefly discussed.Keywords
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