Related Experiment Video
Updated: May 27, 2025
10:40
A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
Published on: April 8, 2018
8.2K
Gate-Tunable Circular Photogalvanic Effects in Two-dimensional Perovskite Ferroelectric-based Transistor toward
Wuqian Guo1, Haojie Xu1,2, Fapeng Sun1,2
1State Key Laboratory of Functional Crystals and Devices, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, P. R. China.
Angewandte Chemie (International Ed. in English)
|February 19, 2025
Summary
Researchers achieved gate-tunable circular photogalvanic effects (CPGE) in perovskite ferroelectrics, enabling multi-state memory. This spintronics advance offers high photocurrent anisotropy for novel optoelectronic devices.
Area of Science:
- Condensed matter physics
- Spintronics
- Optoelectronics
Background:
- Spintronics utilizes spin splitting in asymmetric materials for optoelectronic devices.
- Circular photogalvanic effects (CPGE) are crucial for spin-based optoelectronics.
Purpose of the Study:
- To achieve and investigate gate-tunable CPGE in a biaxial perovskite ferroelectric.
- To explore multi-state memory behaviors based on CPGE.
Main Methods:
- Fabrication of transistor-type devices using (n-HA)2CsPb2Br7.
- Measurement of photocurrents under left- and right-circularly polarized light.
- Gate-voltage modulation of CPGE.
Main Results:
- Achieved gate-tunable CPGE with high photocurrent anisotropy (up to 1.04).
- Demonstrated significant CPGE due to large k-space splitting coefficient.
- Observed six distinct conductance states under circularly polarized light, indicating multi-state memory.
Conclusions:
- The study establishes a pathway for multi-state memory in ferroelectric integrated devices.
- Gate-tunable CPGE in perovskite ferroelectrics shows promise for advanced spintronic applications.
Related Concept Videos
01:25MOS Capacitor
674
A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
674
01:22MOSFET: Enhancement Mode
264
Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
264
01:27Biasing of Metal-Semiconductor Junctions
201
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
201
01:29Field Effect Transistor
283
Field-effect transistors (FETs) are integral to electronic circuits and distinguished by their three-terminal setup: the gate, drain, and source. These transistors operate as unipolar devices, which utilize either electrons or holes as charge carriers, in contrast to bipolar transistors, which use both types of carriers. The primary function of the FET is to modulate the flow of these carriers from the source to the drain through a channel. The voltage difference between the gate and source...
283
01:22Biasing of FET
207
Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the...
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the...
207
01:22Bipolar Junction Transistor
499
Bipolar Junction Transistors (BJTs) are essential elements in electronic circuits, playing a crucial role in the functionality of amplifiers, memories, and microprocessors. These transistors can be designed as NPN or PNP based on their doping patterns. They consist of three layers: the emitter, base, and collector. The configuration of these layers and their respective doping levels—with N-type or P-type impurities—define the transistor's type and its operational...
499