Patent ID: 7745816

Claim:
A nano-transistor, comprising: (a) a photon absorption member; and (b) a carrier injecting member having a first layer formed on the photon absorption member and a second layer formed on the first layer and adapted for injecting carriers from the second layer into the photon absorption member, wherein the carrier injecting member has a horizontal dimension in a scale of nanometers, wherein the photon absorption member and the first and second layers are configured to have an energy band structure that defines a quantum dot in the first layer, such that when a photon is incident to the photon absorption member, an electron-hole pair is generated therein responsively, and one of the electron and hole of the photo-generated electron-hole pair is transported and trapped into the quantum dot in the first layer so as to enhance the concentration of the corresponding carrier therein, thereby enhancing a rate of injected carriers tunneling through the quantum dot in the first layer into the photon absorption member, wherein the injected carriers are complementary to the corresponding carrier trapped in the quantum dot.