Comparative study of P3HT: Graphene nanocomposite based device on flexible PET and glass substrate

Abstract

The flexible substrates are beneficial to manufacture devices with the features including, light weight, economic, and conformability to any surface. However, it is a key challenge to fabricate the composite based devices over flexible substrates of performance similar to the rigid devices. In this paper, we report the fabrication of P3HT:graphene nanocomposite based photodiodes with the architecture of ITO/P3HT:graphene/Al on Indium tin oxide (ITO) coated glass substrate as well as on the ITO coated flexible polyethylene terephthalate (PET) substrate. The measured current-voltage (I-V) characteristics of the fabricated devices on both the PET and glass substrate under dark condition have found to be similar to the Schottky diode. Various essential diode parameters, such as, barrier height, ideality factor, series resistance have been estimated. The flexible device show relatively large photocurrent and small dark current over the measurement range compare to the device over hard substrate that might results from the better interface properties. This indicates the enormous potential of flexible devices for many imperative future applications.