Toward Gant-voltage Generation Beyond 1000 Volts

Reading time ( words)

University of Tokyo researchers have succeeded in developing ferroelectric devices delivering a high voltage of 23 volts under visible light. This result is expected to contribute to clean energy generation from sunlight.

Semiconductor materials capable of converting light into electricity are utilized in photovoltaic cells. However, the voltage that can be generated by present semiconductor-based devices is of the order of a few volts at most. Recently it has been reported that high voltages can be generated in ferroelectric thin films, which has stimulated active research and development of photoelectric conversion devices using ferroelectric materials. However, multiple challenges remained, such as difficulty in establishing device design and still unknown principles behind power generation.

The research group of Associate Professor Yuji Noguchi, then-Project Researcher Ryotaro Inoue and Professor Masaru Miyayama at the Graduate School of Engineering demonstrated the generation of a high voltage from visible light using a crystal of the ferroelectric material barium titanate using a polarization wall with a few nanometers thickness between domains. In addition, the research group showed that by controlling the structure of the polarization wall is possible in principle to obtain huge voltages of over 1000 volts.

“This results obtained in this study may also be applicable to other polar materials such as zinc oxides and gallium nitride,” says Associate Professor Noguchi. He continues, “The combination of this research with conventional semiconductor photovoltaic systems may lead to increases in photoelectric conversion efficiency.”



Suggested Items

Kirigami Inspires New Method for Wearable Sensors

10/22/2019 | University of Illinois
As wearable sensors become more prevalent, the need for a material resistant to damage from the stress and strains of the human body’s natural movement becomes ever more crucial. To that end, researchers at the University of Illinois at Urbana-Champaign have developed a method of adopting kirigami architectures to help materials become more strain tolerant and more adaptable to movement.

Brittle Pals Bond for Flexible Electronics

05/13/2019 | Rice University
Mixing two brittle materials to make something flexible defies common sense, but Rice University scientists have done just that to make a novel dielectric. Dielectrics are the polarized insulators in batteries and other devices that separate positive and negative electrodes. Without them, there are no electronic devices.

Beyond Scaling: An Electronics Resurgence Initiative

06/05/2017 | DARPA
The Department of Defense’s proposed FY 2018 budget includes a $75 million allocation for DARPA in support of a new, public-private “electronics resurgence” initiative. The initiative seeks to undergird a new era of electronics in which advances in performance will be catalyzed not just by continued component miniaturization but also by radically new microsystem materials, designs, and architectures.

Copyright © 2020 I-Connect007. All rights reserved.