概括
本研究工程师将铁电材料用于光伏和电阻切换效应之间的过渡. 通过将SrCoOx纳入NaBiTiO3,研究人员优化了性能,并解决了先进电子应用的权衡问题.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 纳米技术纳米技术
背景情况:
- 铁电光伏效应对于能源采集至关重要,但狭窄的带隙限制了性能.
- 狭窄带隙铁电器中的电导率通常会降低光伏效率.
- 在优化铁电光伏设备时,存在带隙和极化之间的权衡.
研究的目的:
- 设计具有光伏和电阻切换效应之间的演变的铁电材料.
- 解决铁电光伏中的带隙偏振权衡所造成的局限性.
- 为可调节的多功能铁电器件制定战略.
主要方法:
- 在Na0.5Bi0.5TiO3 (NBT) 矩阵中引入具有多价值过渡的SrCoOx (SC).
- 制造 (1-x) NBT-xSC 固体溶液薄膜 (x=0.03,0.05,0.07) 的过程.
- 在工程电影中描述光伏和电阻切换行为.
主要成果:
- 固溶液膜显示了从光伏效应到电阻切换行为的演变.
- 0.95NBT-0.05SC薄膜实现了0.81V的开通电压和23.52μA/cm2的短路电流.
- 0.93NBT-0.07SC薄膜表现出电阻切换,其高切换比率为100.
结论:
- 工程极化场和屏障特征使光伏和电阻切换效应之间的演变成为可能.
- 开发的战略为创建多功能铁电器件提供了一种实际方法.
- 这项工作为克服铁电光伏应用中的性能限制提供了一条途径.
相关概念视频
Dielectric Polarization in a Capacitor
4.8K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
4.8K
P-N junction
583
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
583
Biasing of Metal-Semiconductor Junctions
283
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...
283
Biasing of P-N Junction
608
The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
608
Potential Due to a Polarized Object
439
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
439
Metal-Semiconductor Junctions
392
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
392


