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All‐Optical‐Input Transistors: Light‐Controlled Enhancement of Plasmon‐Induced Photocurrent
Author(s) -
Gao Xu Dong,
Fei Guang Tao,
Zhang Yao,
Zhang Li De,
Hu Ze Min
Publication year - 2018
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201802288
Subject(s) - photocurrent , materials science , plasmon , optoelectronics , transistor , schottky barrier , photoconductivity , optical power , optics , laser , physics , voltage , quantum mechanics , diode
Although phototransistors for controlling photocurrent with electricity have been studied intensively for several decades, transistors with all‐optical inputs that can control the photocurrent with light have not been investigated thus far. In this paper, a plasmonic porous Ag/TiO 2 transistor is fabricated with all‐optical inputs. One light input acts as the source to generate a plasmonic‐hot‐electron photocurrent, while the other gate light changes the current channel by adjusting the height of an Ag/TiO 2 Schottky barrier. As a result, the plasmon‐induced photocurrent generated by the source light can be enhanced by several to one hundred times by controlling the gate light. In addition to signal enhancement, the device can also be used for signal modulation and switching.