Photovoltaic and charge Carrier Transport Parameters of PTOPT
No Thumbnail Available
Date
2007-08
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa University
Abstract
Low cost and easy processability of organic electronic and photonic devices, which
is made from conductive polymer make them to be called a 'noble materials'. The
rise of the idea of self healing materials, especially polymeric materials[21], seems
to make a remarkable change on the short lifetime of the device which is made of organic
polymers. As a consequence, a rapid and de nite analysis of different physical
phenomenons in polymeric devices is expected from the theoretical as well as the the
experimental physics. In this thesis, the photovoltaic and charge transport properties
of the photovoltaic cells made from poly[3-(4-octylphenyl)-2,2'-bithiophene](PTOPT)
was studied. A Schottky diode is prepared from a single layer polymer sandwiched
in Al and PEDOT:PSS/ITO electrode. That is Al/PTOPT/PEDOT:PSS/ITO layered
device structure. By applying a forward bias voltage, the current value for different
voltage is measured and found that a rectifying contact is formed. Then, under
AM 1.5 (one sun) illumination, the J-V data was collected and a power conversion
ef ciency of 0.35% is recorded. Furthermore, dark current-voltage measurement is
made by reversing the polarity of the electrodes. The symmetric nature of the J-V
semi-logarithmic plot reveals that there is a unipolar charge injection in both sides of
the electrodes. As the consequence, from the space charge limited region of the J-V
data, we studied the electric eld dependence of the hole transport in the device and
we determined the zero eld mobility ("$#&%('*),+) -/.102+435)768 93:0,; <>=@? BA ) and the eld
activation factor (CD%E'GFH+0I3J.K02+- L76M N3:0I; O7'P? A /67RQ)
Description
Keywords
Photovoltaic and charge Carrier