Author:

Keywords:

Science & Technology, Technology, Physical Sciences, Materials Science, Multidisciplinary, Optics, Physics, Applied, Materials Science, Physics, CPM, conjugated polymer, blends, sub-bandgap absorption, CONJUGATED POLYMERS, CHARGE-TRANSPORT, DISSOCIATION, 0205 Optical Physics, 0206 Quantum Physics, 0303 Macromolecular and Materials Chemistry, Optoelectronics & Photonics, 5102 Atomic, molecular and optical physics

Abstract:

The constant photocurrent method (CPM) was used to study sub-bandgap absorption in blends of the conjugated polymer MEH-PPV (poly [2-methoxy-5- [2′-ethyl-hexyloxy] -1,4-phenylene vinylene]) and the fullerene PCBM ((6,6) phenyl C61 butyric acid methylester) at different concentrations. The application of CPM to organic semiconductors is discussed in detail. It is argued that in these materials CPM leads to information about the product of the absorption coefficient and the quantum yield, which hampers the interpretation of the results.