Study of the nanoscale surface photovoltage of organic semiconductors combining optical and Kelvin probe microscopy
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Study of the nanoscale surface photovoltage of organic semiconductors combining optical and Kelvin probe microscopy
DIPC Seminars
- Speaker
-
Elisa Palacios- Lidon CIOyN, Universidad de Murcia, Murcia, Spain
- When
-
2012/01/27
13:00
- Place
- Donostia International Physics Center (DIPC).Paseo Manuel de Lardizabal, 4 (nearby the Facultad de Quimica), Donostia
- Add to calendar
-
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Elisa Palacios- Lidon
CIOyN, Universidad de Murcia(Campus Espinardo), E-30100 Murcia (Spain)
[elisapl@um.es](mailto:elisapl@um.es)
Nowadays, organic and molecular electronic has become a hot topic
since devices based on this technology offer a cheap and versatile
alternative to conventional silicon ones. The reliability of organic
photodevices such as plastic solar cells and OLEDs lies on
understanding and tuning their electro optical properties. In these
systems, the relevant photo induced physico-chemical processes take
place at the nanoscale and therefore, a deeper understanding of the
correlation between structural optical and electronic properties at
this scale will shed some light on the open questions about transport
properties and degradation processes of these materials.
To fulfil these requirements, in this work we will explore the
capabilities of Kelvin Probe Microscopy technique (KPM) combined with
traditional optical techniques applied to organic semiconductor thin
films. We propose a novel measuring methodology together with an
appropriated data analysis to study the temporal evolution of
photo-physical and photo-chemical phenomena such as the mesoscale
polymer electronic light induced response and polymer
photo-degradation as well as the local nanoscale electro-optical
properties. In addition, a correlation between changes in the surface
photovoltage (SPV) and in the optical properties due to external
illumination can be established.
One example of the potential and versatility of this technique is the
evolution of the SPV when it is irradiated. During illumination the
SPV reach a maximum value and then, it decrease until no SPV effect is
measured. The corresponding optical micrographs indicate that light
induces photobleaching degrading the polymer. It has been found that
the SPV characteristics strongly depend on the irradiation wavelength
and on the irradiation intensity in a non-trivial way.