57 results about "Physical Composition" patented technology

Provided are a quantum dot and graphene photosensitive field-effect transistor and a manufacturing method thereof. The field-effect transistor structurally and sequentially includes a silicon-based substrate layer, a silicon dioxide layer, a graphene layer, an electrode layer and a quantum dot layer located on the upper portion of the graphene layer and in a middle channel of the electrode layer. The manufacturing process of the field-effect transistor is as follows: firstly, the silicon-based substrate layer and the silicon dioxide layer are prepared in an existing mature technique; secondly, the graphene layer is prepared on the upper portion of the silicon dioxide layer in a wet process transfer method, then the electrode layer including a source electrode and a drain electrode is prepared in a multisource organic vapor phase deposition method, and ultimately, the quantum dot layer is prepared in the middle channel of the electrode layer in a layer-by-layer covering method. The quantum dot layer is ingeniously applied to the middle channel area of the electrode layer in the method that the electrodes are evaporated first and then the quantum dot layer is applied, the quantum dot layer is attached to the upper portion of the graphene layer to form physical composition of quantum dots and graphene materials. The field-effect transistor has high responsivity for incident light of an infrared band.