Photovoltaic and Charge Carrier Transport Parameters of PTOPT

Bizuneh, G/michael (2007) Photovoltaic and Charge Carrier Transport Parameters of PTOPT. Masters thesis, Addis Ababa University.

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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 definite 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 efficiency 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 field dependence of the hole transport in the device and we determined the zero field mobility ("$#&%('*),+ )�-/

Item Type: Thesis (Masters)
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Divisions: Africana
Depositing User: Selom Ghislain
Date Deposited: 24 Sep 2018 13:40
Last Modified: 24 Sep 2018 13:40

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