摘要:
An embodiment of the invention relates to a memory comprising a strained double-heterostructure having an inner semiconductor layer which is sandwiched between two outer semiconductor layers, wherein the lattice constant of the inner semiconductor layer differs from the lattice constants of the outer semiconductor layers, the resulting lattice strain in the double-heterostructure inducing the formation of at least one quantum dot inside the inner semiconductor layer, said at least one quantum dot being capable of storing charge carriers therein, and wherein, due to the lattice strain, the at least one quantum dot has an emission barrier of 1.15 eV or higher, and provides an energy state density of at least three energy states per 1000 nm3, all said at least three energy states being located in an energy band of 50 meV or less.
摘要:
Embodiments of the present disclosure describe structures and techniques to increase carrier injection velocity for integrated circuit devices. An integrated circuit device includes a semiconductor substrate, a first barrier film coupled with the semiconductor substrate, a quantum well channel coupled to the first barrier film, the quantum well channel comprising a first material having a first bandgap energy, and a source structure coupled to launch mobile charge carriers into the quantum well channel, the source structure comprising a second material having a second bandgap energy, wherein the second bandgap energy is greater than the first bandgap energy. Other embodiments may be described and/or claimed.
摘要:
A field effect transistor comprises a SiC substrate 1, a source 3a and a drain 3b formed on the surface of the SiC substrate 1, an insulating structure comprising an AlN layer 5 formed in contact with the SiC surface and having a thickness of one molecule-layer or greater, and a SiO2 layer formed thereon, and a gate electrode 15 formed on the insulation structure. Leakage current can be controlled while the state of interface with SiC is maintained in a good condition.
摘要:
A quantum device functioning as a memory device is provided for allowing high-speed writing and erasing of data with a low gate voltage. A source electrode and a drain electrode are formed on a substrate. A gate electrode is formed between the source and drain electrodes. Between the substrate and the gate electrode, a first barrier layer, a first quantum well layer, a second barrier layer, a second quantum well layer and a third barrier layer are stacked to form coupled quantum well layer. The thickness of each of the first and second barrier layers allows electron tunneling. The thickness of the third barrier layer does not allow electron tunneling. The energy level of the first quantum well layer is higher than the Fermi level of a conduction layer. The energy level of the second quantum well layer is lower than the energy level of the first quantum well layer. With an application of voltage to the gate electrode, a transition of electrons takes place by means of tunneling through the first quantum well layer to the second quantum well layer and the electrons are accumulated therein.
摘要:
A semiconductor memory device comprises a non-doped thick barrier layer formed on the semiconductor substrate, an impurity doped floating conducting layer formed on the thick barrier layer, a thin barrier layer formed on the floating conducting layer and having an asymmetric barrier whose barrier height is higher on the side of the floating conducting layer, a channel layer formed on the thin barrier layer, and a first electrode and a second electrode formed on the channel layer. A write bias voltage which makes a potential of the second electrode higher than that of the first electrode is applied so as to inject electrons from the first electrode to the floating conducting layer through the thin barrier layer, thereby writing information in the floating conducting layer. A read bias voltage lower than the write bias voltage is applied between the first and the second electrodes, and the information stored in the floating conducting layer is read based on whether or not a current flows in the channel layer.