Liang Lei, Pan Er, Cao Guiming, Chen Jiangang, Wang Ruixue, Dong Biao, Liu Qing, Chen Xiong, Luo Xiao, Kong Yongfa, Li Wenwu, Liu Fucai
School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China.
School of Physics, Nankai University, Tianjin, 300071, China.
Nat Commun. 2025 May 14;16(1):4462. doi: 10.1038/s41467-025-59697-z.
Ferroelectric materials are promising for developing non-volatile memory, neuromorphic computing, and photovoltaic technologies. Taking advantage of variable switching kinetics provides an important strategy for designing multifunctional ferroelectric devices. However, the conventional ferroelectrics due to the unmovable atomic species generally own a single switching kinetics, thus versatile and configurable switching kinetics still remain challenging. In this work, we systematically investigate the switching kinetics of the van der Waals ferroionic CuInPS through polarization-determined ferroelectric photovoltaic behaviors. Based on the time- and field-dependent polarization switching and numerical simulation, we discover three switching modes, including intralayer switching, interlayer switching and intralayer-interlayer coupling switching in CuInPS. Through designing the poling voltage amplitude and width, we achieve the configurable kinetic control of polarization switching in CuInPS, enabling tunable binary, gradual and accumulative switching with defined poling voltages in a single device. The work demonstrated here is instructive for the development of nanoscale multifunctional ferroelectric devices.
铁电材料在开发非易失性存储器、神经形态计算和光伏技术方面具有广阔前景。利用可变的开关动力学为设计多功能铁电器件提供了重要策略。然而，由于原子种类不可移动，传统铁电体通常具有单一的开关动力学，因此多功能且可配置的开关动力学仍然具有挑战性。在这项工作中，我们通过极化确定的铁电光伏行为系统地研究了范德华铁离子CuInPS的开关动力学。基于时间和场依赖的极化切换以及数值模拟，我们在CuInPS中发现了三种切换模式，包括层内切换、层间切换和层内-层间耦合切换。通过设计极化电压幅度和宽度，我们实现了CuInPS中极化切换的可配置动力学控制，能够在单个器件中通过定义的极化电压实现可调谐的二进制、渐进式和累积式切换。这里展示的工作对纳米级多功能铁电器件的开发具有指导意义。
