Dual-function semiconducting polymer devices: Light-emitting and photodetecting diodes
- 21 March 1994
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 64 (12), 1540-1542
- https://doi.org/10.1063/1.111885
Abstract
Thin film devices made with poly[2‐methoxy‐5‐(2’‐ethyl‐hexyloxy)‐1,4‐phenylene vinylene], MEH‐PPV, are known to be efficient light‐emitting diodes. The same devices, under reverse bias, exhibit excellent sensitivity as photodiodes. Thus the polymer tunnel diode is a dual‐function device. For the Ca/MEH‐PPV/ITO (indium/tin oxide) layered structure, the external quantum efficiency for electroluminescence is ≊1% photons/electron (forward bias ≳2.5 V). The same device is sensitive as a photodiode: The dc sensitivity (−10 V, reverse bias) is 9×10−2 A/W (at ∼1‐μW/cm2 input) corresponding to a quantum yield of more than 20% electrons/photon.Keywords
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