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Reconfigurable logic and neuromorphic circuits based on electrically tunable two-dimensional homojunctions

Abstract

Reconfigurable logic and neuromorphic devices are crucial for the development of high-performance computing. However, creating reconfigurable devices based on conventional complementary metal–oxide–semiconductor technology is challenging due to the limited field-effect characteristics of the fundamental silicon devices. Here we show that a homojunction device made from two-dimensional tungsten diselenide can exhibit diverse field-effect characteristics controlled by polarity combinations of the gate and drain voltage inputs. These electrically tunable devices can achieve reconfigurable multifunctional logic and neuromorphic capabilities. With the same logic circuit, we demonstrate a 2:1 multiplexer, D-latch and 1-bit full adder and subtractor. These functions exhibit a full-swing output voltage and the same supply and signal voltage, which suggests that the devices could be cascaded to create complex circuits. We also show that synaptic circuits based on only three homojunction devices can achieve reconfigurable spiking-timing-dependent plasticity and pulse-tunable synaptic potentiation or depression characteristics; the same function using complementary metal–oxide–semiconductor devices would require more than ten transistors.

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Fig. 1: Structure and mechanism of the ETH device.
Fig. 2: Field-effect characteristics of the ETH device.
Fig. 3: Reconfigurable logic functions circuit.
Fig. 4: Reconfigurable synaptic functions circuit.

Data availability

The data that support the plots within this manuscript and other findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

This work was supported in part by the National Natural Science Foundation of China (61625402, 61921005 and 61974176), and the Collaborative Innovation Center of Advanced Microstructures and Natural Science Foundation of Jiangsu Province (BK20180330), Fundamental Research Funds for the Central Universities (020414380084). K.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by MEXT, Japan, A3 Foresight by JSPS and a CREST (JPMJCR15F3) from JST. The authors thank S. Liu and Q. Qian from Southeast University, and L. Shao from Nanjing University for their helpful discussions.

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F.M., S.-J.L. and C.P. conceived the idea and designed the experiments. F.M. and S.-J.L. supervised the whole project. C.P. fabricated the ETH devices and performed all the experiments. Chenyu Wang, Y.W., T.C. and P.W. assisted in the device fabrication and circuit measurements. C.P., Chenyu Wang, S.-J.L. and F.M. analysed the experimental data. K.W. and T.T. prepared the h-BN samples. Cong Wang, S.W., A.G., B.C. and E.L. contributed to the discussions. C.P., S.-J.L. and F.M. co-wrote the manuscript with inputs from all the co-authors.

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Correspondence to Shi-Jun Liang or Feng Miao.

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Pan, C., Wang, CY., Liang, SJ. et al. Reconfigurable logic and neuromorphic circuits based on electrically tunable two-dimensional homojunctions. Nat Electron 3, 383–390 (2020). https://doi.org/10.1038/s41928-020-0433-9

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