Electrical Characterization of Photodetectors Based on Poly(3-hexylthiophene-2,5-diyl) Layers
- Resource Type
- article
- Authors
- Juan Carlos Ferrer; José Luis Alonso; Susana Fernández de Ávila
- Source
- Sensors, Vol 14, Iss 3, Pp 4484-4494 (2014)
- Subject
- photodetectors
conducting polymers
P3HT
organic devices
Chemical technology
TP1-1185
- Language
- English
- ISSN
- 1424-8220
This paper presents the electrical characteristics of solution-processed organic photodetectors based on poly(3-hexylthiophene-2,5-diyl) semiconducting polymer layers deposited by spin-coating on interdigitated metal electrodes. Four different electrode shapes have been used for this study in order to appraise the optimum electrode geometry. The measurement of the resistance as a function of the temperature reveals a transition from negative to positive temperature coefficient material around 80 °C for the polymer layers. Besides, slow reversible changes in the photodetectors conductivity were observed when moved from vacuum to the air and under illumination with a xenon lamp, which can be explained by the formation of charge transfer complexes with molecular oxygen and the polymer. The photogenerated current-light power ratio was found to be approximately linear in the 200 to 550 mW/cm2 range.