We report a giant persistent photoconductivity (GPPC) phenomenon in VO2 film device prepared on corning glass substrate. With a single pulse laser irradiation onto the device at bias voltages of 7 V and 8 V, the VO2 film makes an insulator-to-metal transition with a sharp increase of photo current. The photo current remained at a highly conductive state for long period, e.g. the photo current for VO2 device was decreased only ~1% in one day. The GPPC was found within the limit of critical voltages of the hysteresis loop in voltage vs current curve of the device. High speed time-current measurements on the device with a 20 ms single pulse laser irradiation revealed that the onset of abrupt photo current occurs in less than 1 ms time scale. The GPPC in VO2 device can contribute in realizing ultrafast optical remote control of advanced electronic devices i.e. optical memories, displays, and remote ultrafast switching devices.
|Journal||Applied Materials Today|
|Publication status||Published - 2021 Mar|
Bibliographical noteFunding Information:
H. L. Ju and G. Y. Lee would like to thank the Basic Science Research Program for support through the National Research Foundation of Korea (NRF) funded by the Korean government (MOE) ( NRF-2020R1F1A1061298 , NRF-2018R1A6A3A01012528 , NRF-2019R1I1A1A01041427 ). B. S. Mun would like to acknowledge the supports from the National Research Foundation of Korea ( NRF-2015R1A5A1009962 , NRF-2019R1A2C2008052 ) and the GIST Research Institute Grant funded by the Gwangju Institute of Science and Technology (GIST) 2020.
© 2020 The Author(s)
All Science Journal Classification (ASJC) codes
- Materials Science(all)