Abstract:
:We report color-selective photodetection from intermediate, monolayered, quantum dots buried in between amorphous-oxide semiconductors. The proposed active channel in phototransistors is a hybrid configuration of oxide-quantum dot-oxide layers, where the gate-tunable electrical property of silicon-doped, indium-zinc-oxide layers is incorporated with the color-selective properties of quantum dots. A remarkably high detectivity (8.1 × 1013 Jones) is obtained, along with three major findings: fast charge separation in monolayered quantum dots; efficient charge transport through high-mobility oxide layers (20 cm2 V-1 s-1); and gate-tunable drain-current modulation. Particularly, the fast charge separation rate of 3.3 ns-1 measured with time-resolved photoluminescence is attributed to the intermediate quantum dots buried in oxide layers. These results facilitate the realization of efficient color-selective detection exhibiting a photoconductive gain of 107, obtained using a room-temperature deposition of oxide layers and a solution process of quantum dots. This work offers promising opportunities in emerging applications for color detection with sensitivity, transparency, and flexibility.The development of highly sensitive photodetectors is important for image sensing and optical communication applications. Cho et al., report ultra-sensitive photodetectors based on monolayered quantum dots buried in between amorphous-oxide semiconductors and demonstrate color-detecting logic gates.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Cho KS,Heo K,Baik CW,Choi JY,Jeong H,Hwang S,Lee SYdoi
10.1038/s41467-017-00893-xsubject
Has Abstractpub_date
2017-10-10 00:00:00pages
840issue
1issn
2041-1723pii
10.1038/s41467-017-00893-xjournal_volume
8pub_type
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