Summary of Ultralow Power Transistors Function for Years Without Batteries
Cambridge University researchers developed ultralow power transistors capable of operating for years without batteries by harvesting environmental energy. These thin-film transistors (TFTs) utilize indium-gallium-zinc-oxide films with minimized oxygen vacancies to function in a near-off state at voltages under 1 volt and power levels below 1 nanowatt. The design employs the Schottky barrier to isolate electrodes, allowing for smaller sizes and compatibility with printable materials like glass, paper, and plastic.
Parts used in the Ultralow Power Transistor Project:
- Indium-gallium-zinc-oxide (In-Ga-Zn-O) thin films
- Near-off-state current mechanism
- Schottky barrier
- Glass substrate material
- Paper substrate material
- Plastic substrate material
Researchers at Cambridge University have just achieved a spectacular breakthrough in electronics design. They have developed new ultralow power transistors that could function for months or even years without a battery. These transistors look for energy from the environment around, thus reducing the amount of power used.
Dr Sungsik Lee, one of the researchers at the Department of Engineering says, “if we were to draw energy from a typical AA battery based on this design, it would last for a billion years.” The new design could be produced in low temperatures and they are versatile enough to be printed on materials like glass, paper, and plastic.
Basically, transistors are semiconductor devices that function like a faucet. Turn a transistor on and the electricity flows, turn it off and the flow stops. When a transistor is off however, some electric current could still flow through, just like a leaky faucet. This current, which is called a near-off-state, was exploited by the engineers to power the new transistors.
The researchers developed a thin-film transistor (TFT) from In-Ga-Zn-O (indium-gallium-zinc-oxide) thin films. To make the material less conductive, the films were fabricated to avoid oxygen vacancies. Eventually, they achieved a new design that operates in near the OFF state at low supply voltages (<1 volt) and ultralow power (<1 nanowatt).
The transistor’s design also utilizes a ‘non-desirable’ characteristic, namely the ‘Schottky barrier’ to create smaller transistors. Transistors today cannot be manufactured into smaller sizes since the smaller a transistor gets, the more its electrodes influence each other, causing a non-functioning transistor.The use of the Schottky barrier in the new design creates seal between the electrodes that make them work independently from each other.
For more detail: Ultralow Power Transistors Function for Years Without Batteries
- How long can the new transistors function without a battery?
The transistors could function for months or even years without a battery. - What energy source do these transistors use?
They look for energy from the environment around them. - Can these transistors be printed on specific materials?
Yes, they are versatile enough to be printed on materials like glass, paper, and plastic. - What material is used to fabricate the thin-film transistor?
The researchers developed the transistor from In-Ga-Zn-O (indium-gallium-zinc-oxide) thin films. - How does the new design prevent electrode interference?
It utilizes the Schottky barrier to create a seal between electrodes so they work independently. - What is the power consumption level of the new design?
The design operates at ultralow power of less than 1 nanowatt. - At what voltage does the new transistor operate?
It operates in near the OFF state at low supply voltages less than 1 volt. - Why was oxygen vacancy avoidance important in fabrication?
Avoiding oxygen vacancies made the films less conductive, which was necessary for the new design.
