Nonvolatile van der Waals Heterostructure Phototransistor for Encrypted Optoelectronic Logic Circuit
Shuang Wang, Xuan Pan, Lingyuan Lyu, Chenyu Wang, Pengfei Wang, Chen Pan, Yuekun Yang, Cong Wang, Jingwen Shi, Bin Cheng, Wentao Yu, Shi‐Jun Liang, Feng Miao
Abstract
With the rising demand for information security, there has been a surge of interest in harnessing the intrinsic physical properties of device for designing a secure logic circuit. Here we provide an innovative approach to realize the secure optoelectronic logic circuit based on nonvolatile van der Waals (vdW) heterostructure phototransistors. The phototransistors comprising WSe2 and h-BN flakes exhibit electrical tunability of nonvolatile conductance under cooperative operations of electrical and light stimulus. This intriguing feature allows the phototransistor to work as a building block for the design of secure optoelectronic logic circuit in which the information encryption can be directly achieved with a designed secret key. On the basis of this approach, we assemble two phototransistors into an optoelectronic hybrid circuit and implement a functionally complete set of logic gates (i.e., NOR, XOR, and NAND) in a reconfigurable manner. Our findings highlight the potential of nonvolatile phototransistors for the development of reconfigurable secure optoelectronic circuits.