Enhanced Photodetectivity of Organic Phototransistors (OPTs) in Various Range of Light Source with Single-walled Carbon Nanotubes
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Photodetectors get much more interests for advanced health care service and climate change monitoring. Organic phototransistors (OPTs) have advantages such as low temperature processability, large area flexible device fabricable and bandgap tunability. However, there are some restrictions in OPTs such as low drain current and insufficient detectivity. We adopted semiconducting single-walled carbon nanotubes (s-SWNTs) to obtain higher detectivity. All the OPTs show reasonable detectivity enhancement with s-SWNT layer through carrier density increment. Especially, the UV range s-SWNT assisted OPTs show highly enhanced detectivity with polyfuorene derivative which is the s-SWNT sorting polymer. The optical carrier density was decided by the nature of defects in active layer. The others show negative detection characteristics were shown and it assumed that defects by hetero-material interfaces with conjugated polymers such as F8BT, N2200, and etc. The enhanced photoresponsivity was analyzed through conventional field-effect transistor measurement under light and dark environment.