We report on the photoresponse from tetracene-based and pentacene-based thin-film transistors (TFTs) with semitransparent Ni Ox source/drain electrodes and Si O2 p+ -Si substrate. Both organic TFTs have been fabricated with identical channel thickness and device geometry. Compared with pentacene-based TFTs, the tetracene-TFT exhibited superior potentials as a photodetector in the visible and ultraviolet range although it showed a field mobility (μ=0.003 cm2 V s) which is two orders of magnitude lower than that of the pentacene-based TFT (μ=∼0.3 cm2 V s). The tetracene-TFT displayed a high photo-to-dark current ratio (Iph Idark) of 3× 103, while that of the pentacene-TFT was only ∼10.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)