材料科学
电介质
科尔-科尔方程
电导率
活化能
放松(心理学)
阿伦尼乌斯图
阿累尼乌斯方程
凝聚态物理
晶界
四方晶系
电阻率和电导率
介电损耗
介电谱
分析化学(期刊)
复合材料
晶体结构
光电子学
结晶学
物理化学
微观结构
电化学
物理
色谱法
电极
社会心理学
量子力学
化学
心理学
作者
Aditi Sahoo,Tufan Paul,Soumen Maiti,Rupak Banerjee
出处
期刊:Nanotechnology
[IOP Publishing]
日期:2022-01-28
卷期号:33 (19): 195703-195703
被引量:27
标识
DOI:10.1088/1361-6528/ac4fe5
摘要
Two dimensional (2D) CsPb2Br5have been successfully synthesized via the chemical precipitation method. Detailed structural, morphological, optical, and dielectric studies of these materials have been performed. These 2D CsPb2Br5plates (of thickness around 200-300 nm) are ascribed to a tetragonal lattice system withI4/mcmspace group. The dielectric attributes such as dielectric constant, electrical modulus, loss factor, and the DC, and AC conductivities, are observed to be varying appreciably with temperature over an extensive frequency window of 10 Hz-50 MHz. The Nyquist plots are investigated using the Maxwell-Wagner equivalent circuit model, which shows the impact of grains and grain boundaries on the overall impedance. Both the free charge conductivity and space charge increase with an increment in temperature, as revealed from the modified Cole-Cole plot. The relaxation time and relaxation mechanism of 2D CsPb2Br5are estimated using the Kohlrausch-Williams-Watts equation. Variation in DC conductivity and relaxation time, as a function of temperature, closely resembles Arrhenius' behavior. Value of activation energy calculated from the DC conductivity corroborates with the same derived from relaxation time. The observation of high dielectric constant and nominal dielectric loss for CsPb2Br5perovskite offers enormous potential in energy harvesting and storage devices.
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