Search
Menu
Photonics HandbookResearch & Technology

Perovskite Optoelectronic Logic Gates Activate Sensor Platforms

Facebook X LinkedIn Email
SEOUL, South Korea, May 16, 2022 — Researchers at the Korea Institute of Science and Technology (KIST) and the Gwangju Institute of Science and Technology (GIST) designed an optoelectronic logic gate (OELG) made from organic-inorganic perovskite photodiodes. The OELG architecture will help computers quickly calculate and process large amounts of information, the researchers said.

A logic gate platform that can accurately compute extensive data sets, while consuming less power, is needed to support the trend toward data-intensive technologies such as artificial intelligence. Existing electronic circuits and processors are limited by performance shortfalls in switching, operation, computing, and decision-making.

The perovskite OELG is based on the bipolar spectral photoresponse characteristics of a self-powered perovskite photodetector (SPPD) that has a back-to-back (p+-i-n-p-p+) diode structure consisting of low-band and high-band perovskites. The key components used in the SPPD OELG to execute Boolean logics are a back-to-back configuration (i.e., p+-i-n-p-p+) based on two vertically stacked perovskite diodes, and optical gate modulation using visible and near-infrared light. The SPPD OELG uses light as an input signal. The desired binary logic operation is achieved by inputting two different wavelengths of light.

Conceptual image of an optical processor chip for optical computers using perovskite optoelectronic logic gates (OELGs). The OELG designed by a team of researchers from KIST and GIST could be applied to healthcare sensing, as well as multiple applications in optical computing and communication. Courtesy of Korea Institute of Science and Technology (KIST).
Conceptual image of an optical processor chip for optical computers using perovskite optoelectronic logic gates (OELGs). The OELG designed by a team of researchers from KIST and GIST could be applied to health care sensing, as well as multiple applications in optical computing and communication. Courtesy of KIST.
The output discrimination of the SPPD OELG is based on the polarity of the photocurrent, which can be tuned by optical gate modulation using visible (625 nm) and near-infrared (940 nm) light. The output state of 1 or 0 is determined by the positive or negative output photocurrent, respectively, allowing the SPPD OELG to execute more than one logic gate operation for the same input. The researchers demonstrated five basic logic operations — AND, OR, NAND, NOR, and NOT — with a single SPPD.


An 8 × 8 logic array consisting of 64 SPPD pixels comprises the OELG platform, which executed all five logic gates at 100% yield without any errors, regardless of electrical noise or current variation between the pixels. The ability of one logic gate to perform the functions of five could enable high spatial efficiency and integration in optical processors.

“The optoelectronic logic gate developed through this research is an outcome of optical computing R&D that realizes five basic logic operations into one device, and will greatly contribute to next-generation optical communication, optical networks, and health care R&D,” GIST professor Gun Young Jung said.

In addition to its high-speed and high-efficiency characteristics, the SPPD OELG demonstrated low energy loss physically, and can operate without an electrical power supply by using only light energy. In contrast, electronic semiconductor logic gates, which serve as the “brains” of today’s computers, have a limited capacity to perform high-speed data calculation and processing. They also consume a lot of energy and generate considerable heat.

Data processing with specific instructions (e.g., add, multiply, or count) could be implemented with a combinational circuit of multiple SPPD-OELGs in a single chip, the researchers said. This would be more efficient spatially and economically, compared to conventional logic circuits based on electronic transistors.

In the future, SPPD-OELGs could improve applications for optical computing, optical communication, and logic memory. In the short term, the new OELGs could be applied to light-fidelity (Li-Fi) transmission, security circuits, and health care sensors, using to advantage the optoelectronic output states based on the photocurrent polarity.

“Perovskite optoelectronic logic gates that execute multiple logic operations in response to optical input are expected to be used for ultrasmall and low-power universal optical sensor platforms in the future,” KIST researcher Yusin Pak said.

The research was published in Nature Communications (www.doi.org/10.1038/s41467-022-28374-w).

Published: May 2022
Glossary
optoelectronics
Optoelectronics is a branch of electronics that focuses on the study and application of devices and systems that use light and its interactions with different materials. The term "optoelectronics" is a combination of "optics" and "electronics," reflecting the interdisciplinary nature of this field. Optoelectronic devices convert electrical signals into optical signals or vice versa, making them crucial in various technologies. Some key components and applications of optoelectronics include: ...
photocurrent
The current that flows through a photosensitive device, such as a photodiode, as the result of exposure to radiant power.
photodetector
A photodetector, also known as a photosensor or photodiode, is a device that detects and converts light into an electrical signal. Photodetectors are widely used in various applications, ranging from simple light sensing to more complex tasks such as imaging and communication. Key features and principles of photodetectors include: Light sensing: The primary function of a photodetector is to sense or detect light. When photons (particles of light) strike the active area of the photodetector,...
optical computingoptical computelogic gatesoptical logic gatesoptoelectronicsAsia PacificKISTGISToptical communicationoptical sensorssensorsperovskitesMaterialsphotocurrentCommunicationsphotodetectorperovskite photodetectorElectro-optical gatesResearch & Technologyeducation

We use cookies to improve user experience and analyze our website traffic as stated in our Privacy Policy. By using this website, you agree to the use of cookies unless you have disabled them.