UCLA team develops a perovskite photodectector
UCLA researchers have developed a perovskite photodetector that could reduce manufacturing costs and improve the quality of medical and commercial light sensors.
The research team led by Yang Yang, the Carol and Lawrence E. Tannas Jr. Professor of Engineering at the UCLA Henry Samueli School of Engineering and Applied Science, has developed a photodetector that uses thin coatings of perovskite. The perovskite coating is roughly 300nm, while the silicon layer in common photodetectors is 100Âµm, or more than 330 times as thick.
As a result, the device efficiently and quickly transports signals with minimum loss. It also offers improved sensitivity under dim light. The research was published today in Nature Communications.
"This device has the potential to improve the efficiency and contrast in optical sensors used in various applications," said Yang Yang, principal investigator on the research and a member of the California NanoSystems Institute. "Production requires less energy and time than is currently needed to make photodetectors, and so promises to make manufacturing on the industrial scale very cost-efficient."
The photodetector is made using a process that essentially coats layers of the device in a liquid form of perovskite at roughly 300degF. The process doesn't require the energy-consuming high heat or powerful vacuum procedures used to develop today's commercial photodetectors.
The researchers also inverted the typical design of a perovskite-based photovoltaic cell, altering the materials that interface directly with the perovskite layer to improve its performance, especially response speed.
"Our innovation is using the perovskite material on a photodetector, and then putting it in the proper structure so that the material can work most efficiently," said Ziruo Hong, one of the authors of the paper and a research engineer in Yang Yang's lab.
The research was supported by the National Science Foundation and Air Force Office of Scientific Research.