| Autor: |
Jung KH; ICT Creative Research Laboratory, Electronics and Telecommunications Research Institute, Daejeon 34129, Republic of Korea., Yeon C; Thin Film Materials Development Team, Soulbrain, Gongdan-Gil, Gongju 14-102, Republic of Korea., Yang J; ICT Creative Research Laboratory, Electronics and Telecommunications Research Institute, Daejeon 34129, Republic of Korea.; Department of Advanced Device Technology, Korea University of Science and Technology, Daejeon 34113, Republic of Korea., Cheon YJ; ICT Creative Research Laboratory, Electronics and Telecommunications Research Institute, Daejeon 34129, Republic of Korea., Lim JW; ICT Creative Research Laboratory, Electronics and Telecommunications Research Institute, Daejeon 34129, Republic of Korea.; Department of Advanced Device Technology, Korea University of Science and Technology, Daejeon 34113, Republic of Korea., Yun SJ; ICT Creative Research Laboratory, Electronics and Telecommunications Research Institute, Daejeon 34129, Republic of Korea.; Department of Advanced Device Technology, Korea University of Science and Technology, Daejeon 34113, Republic of Korea. |
| Abstrakt: |
Two-dimensional (2D) transition metal dichalcogenides (TMDs) have attracted significant attention for their outstanding optoelectrical properties. Unlike most TMDs with layer-dependent photoresponsivity, rhenium disulfide (ReS 2 ) shows excellent thickness-independent photoresponsivity. Herein, we show a surfactant-free polyvinyl alcohol (PVA)-assisted exfoliation method for 2D-TMDs in aqueous solution and a transparent photosensitive memristor synapse device based on ReS 2 nanosheets composited with PVA. ReS 2 nanosheets are obtained via PVA-assisted exfoliation. After exfoliation, the ReS 2 -PVA dispersion solution is spin-coated on a substrate and dried to form a nanocomposite film without additional processing. Transparent memristors are then fabricated on plastic or glass substrates to demonstrate the applicability of the ReS 2 -PVA film. The devices show "write once, read many" memory behavior with a high ON/OFF current ratio (1.0 × 10 4 at 0.5 V) during electrical operation. In the high resistive state, synaptic functions with long-term memory behavior are successfully mimicked by applying photonic stimuli to the transparent ReS 2 -PVA memristors. The excitatory postsynaptic current stimulated by the photosignal is gradually reduced by electric stimuli. The proposed PVA-assisted exfoliation method is cost-effective, environmentally friendly, and applicable to various TMD nanomaterials. Furthermore, the ReS 2 -PVA nanocomposite film obtained via a simple solution-based process demonstrates excellent photosynaptic behavior. |
