Electrical Characterization of Photodetectors Based on Poly(3-hexylthiophene-2,5-diyl) Layers

Sensors

Juan Carlos Ferrer¹  José Luis Alonso² 

[1] Área de Electrónica, Universidad Miguel Hernández, Av. Universidad s/n, Ed. Quorum V, Elche 03202, Spain;

关键词: photodetectors;    conducting polymers;    P3HT;    organic devices;   

DOI  :  10.3390/s140304484

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.