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Tuning the photoresponse in organic field-effect transistors

Mirella El Gemayel,Matthias Treier Chiara Musumeci, Chen Li, Klaus Müllen, Paolo Samorì, USA (2012)

We report on the fabrication of solution processed organic phototransistors (OPTs) based on perylenebis(dicarboximide)s (PDIs). We found that the responsivity to the photo-illumination depends on the transistor’s channel length and that it can be tuned by varying the device geometry. The analysis of different morphologies of the active semiconducting layer revealed that single PDI fibers exhibit the higher photo-response when compared to more poorly organized films. The highest responsivity value of 4.08±1.65 x 105 A/W was achieved on a multifiber based OPT. These findings represent a step forward towards the use of organic based phototransistors as photosensors.

Partners : MPG, UdS

Place of Publication : USA

Date of Publication : 2012/01/05

Link to the online version of the article.