66 / 2020-03-19 16:05:48

Thickness-dependent photoresponse of P3HT:PCBM organic photodiode fabricated by drop-casting method

Photodetector; active layer; dark current; responsivity; detectivity

Microelectronic Devices and Materials > Organic Semiconductor Devices and Technologies

In this article, P3HT:PCBM organic photodetectors with micrometer level thickness active layer are fabricated by drop casting method. It is found that while the dark current of these detectors are all ~10 nA cm^-2, the photoresponse of these OPD decreases with thickness. When the active layer thickness is ~2 µm, a responsivity as high as 0.86 A/W is achieved when biased at -3V, resulting in a detectivity up to 10¹³ Jones.