Disclosed herein is an electronic device of a three-terminal type
including, a control electrode, first and second electrodes, and an
active layer provided between the first and second electrodes so as to
face the control electrode with an insulating layer interposed
therebetween, the active layer being formed from an aggregate of a
composite material formed from inorganic semiconductor fine particles
covered with a protective layer, the protective layer including an alkyl
chain having, at one end thereof, a functional group bonded to an
inorganic semiconductor fine particle and further having an organic
semiconductor molecule bonded to the other end thereof.