Electronic Materials & Devices Laboratory, Kyushu University


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744 Motooka, Nishi-ku, Fukuoka 819-0395
Graduate School of Information Science and Electrical Engineering, Kyushu University
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Research Projects
High-speed ultra-small E/O converters utilizing a novel semiconducting material “ZION”

We are facing serious “information explosion” problems. It causes huge energy consumption and environmental impacts. Recently, The Guardian reported that “about 7% of the world’s electricity consumption is taken by IT devices in 2017, and this is forecast to grow annually at about 7% through to 2030”. They also reported “a desktop PC running eight hours a day emits 175 kg of CO2 in a year”.

My laboratory is trying to solve these problems with “exciton devices”. Exciton - an electrically neutral quasiparticle- is a bound state of an electron-hole pair attracted by the electrostatic Coulomb force. The most interesting feature of an exciton is that it can be generated by and converted back into a photon within a short time. Devices using excitons as carriers should bring great improvements to the speed of electronic–optical (E/O) conversion along with significant miniaturizations of E/O converters. They will replace electric wiring on computer chips with optics, and thus enable us to make high-performance and low-power consuming data processors!

In my laboratory, we have developed an excitonic device with a new semiconducting material, (ZnO)x(InN)1-x (hereafter ZION). It has a large exciton binding energy that potentially bring us excitonic devices operational at room temperature.

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