  The rapidly developing research field of organic analogue sensors aims to
replace traditional semiconductors with naturally occurring materials.
Photosensors, or photodetectors, change their electrical properties in response
to the light levels they are exposed to. Organic photosensors can be
functionalised to respond to specific wavelengths, from ultra-violet to red
light. Performing cyclic voltammetry on fungal mycelium and fruiting bodies
under different lighting conditions shows no appreciable response to changes in
lighting condition. However, functionalising the specimen using PEDOT:PSS
yields in a photosensor that produces large, instantaneous current spikes when
the light conditions change. Future works would look at interfacing this
organic photosensor with an appropriate digital back-end for interpreting and
processing the response.
