Flexible pentacene organic field-effect phototransistor

A photoresponsive organic field-effect transistor was fabricated on indium tin oxide deposited onto polyethersulphone flexible substrate with pentacene as the active material and poly(4-vinyl phenol) as the dielectric material. The mobility, threshold voltage and maximum number of interface traps for the pentacene-OTFT under dark, UV and white light illuminations were found to be 2.22 × 10−1 cm2/V s, 12.97 V, 1.472 × 1013 eV−1 cm−2 and 2.93 × 10−1 cm2/V s,14.84 V, 1.431 × 1013 eV−1 cm−2 and 2.95 × 10−1 cm2/V s, 17.70 V, 1.447 × 1013 eV−1 cm−2, respectively. The phototransistor under UV and white illuminations exhibits a high photosensitivity in the off state. The obtained results indicate that the flexible pentacene transistor could be potentially used in photodetectors by a white light and UV optical gate.