Duan Research Group

Hetero-integrated Nanostructures and Nanodevices


Programmable devices based on reversible solid-state doping of two-dimensional semiconductors with superionic silver iodide

Sung-Joon Lee, Zhaoyang Lin, Jin Huang, Christopher S. Choi, Peng Chen, Yuan Liu, Jian Guo, Chuancheng Jia, Yiliu Wang, Laiyuan Wang, Qingliang Liao, Imran Shakir, Xidong Duan, Bruce Dunn, Yue Zhang, Yu Huang & Xiangfeng Duan

Nat. Electron. 3, 630-637 (2020)

Two-dimensional (2D) semiconductors are attractive for electronic devices with atomically thin channels. However, controlling the electronic properties of the 2D materials by incorporating impurity dopants is inherently difficult due to the limited physical space in the atomically thin lattices. Here we show that a solid-state ionic doping approach can be used to tailor the carrier type in 2D semiconductors and create programmable devices. Our strategy exploits a superionic phase transition in silver iodide to induce switchable ionic doping. We create few-layer tungsten diselenide (WSe2) devices that can be reversibly transformed into transistors with reconfigurable carrier types and into diodes with switchable polarities by controllably poling the van der Waals integrated silver iodide above the superionic phase transition temperature. We also construct complementary logic gates by integrating and programming identical transistors, and show that the programmed functions can be erased by an external trigger (temperature or ultraviolet irradiation) to create the temporary and delible electronics that are desirable for electronic security.
UCLA, Department of Chemistry and Biochemistry
607 Charles E. Young Drive East, Box 951569
Los Angeles, CA 90095-1569
E-mail: xduan@chem.ucla.edu