Probing the opto-electronic, thermoelectric, thermodynamic and elastic responses of lead-free double perovskite Li2ATlCl6 (A = Na and K) for potential photovoltaic and high- energy applications: A DFT study

IF 3.9 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Qiguo Xiao , Abrar Nazir , Ejaz Ahmad Khera , Mumtaz Manzoor , Ramesh Sharma , Javed Rahman , Sabah Ansar , Farooq Ali
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引用次数: 0

Abstract

The physical properties of double halide perovskite Li2ATlCl6 (A = Na and K) were examined through a first-principles study and semi-classical Boltzmann theory using the WEIN2k package, focusing on renewable energy generation and solar cell applications. Research on halides is growing within the optoelectronics and thermoelectric field and is anticipated to meet energy shortage demands. The volume-energy diagram confirms their structural stability, while the Pugh and Poisson ratios suggest ductility based on their elastic properties. The electronic properties were analyzed, and bandgaps were calculated using modified Becke-Johnson (mBJ) potentials, yielding bandgaps of 3.51 eV and 2.97 eV for Li2ATlCl6 (A = Na and K) respectively. The optical properties, evaluated using complex dielectric functions, indicated optimal light absorption in the infrared (IR) regions. Additionally, the thermoelectric (TE) properties of Li2ATlCl6 (A = Na and K) were analyzed using semi classical Boltzmann theory with a constant relaxation time approximation. At 1200 K, the calculated figures of merit (ZT) values were 0.75 and 0.69, respectively, indicating their potential for thermoelectric applications. Also, the thermodynamic properties are computed under pressure (0–15 GPa) and temperature (0–1200 K). These investigations offer a profound comprehension of these materials for their further employment. These results highlight their potential for optoelectronic device applications and are expected to encourage further experimental research on the feasibility of Li2ATlCl6 (A = Na and K) for optical devices.
探测无铅双钙钛矿Li2ATlCl6 (A = Na和K)的光电、热电、热力学和弹性响应,用于潜在的光伏和高能应用:DFT研究
利用WEIN2k软件包,通过第一性原理研究和半经典玻尔兹曼理论,研究了双卤化物钙钛矿Li2ATlCl6 (A = Na和K)的物理性质,重点研究了可再生能源发电和太阳能电池的应用。在光电和热电领域对卤化物的研究正在增长,并有望满足能源短缺的需求。体积-能量图证实了它们的结构稳定性,而皮尤比和泊松比根据它们的弹性特性表明了延展性。分析了Li2ATlCl6 (A = Na)和Li2ATlCl6 (K)的电子特性,并利用修正的Becke-Johnson (mBJ)势计算了带隙,分别得到了3.51 eV和2.97 eV的带隙。利用复介电函数对其光学特性进行了评价,表明在红外(IR)区域具有最佳的光吸收。利用半经典玻尔兹曼常数松弛时间近似理论分析了Li2ATlCl6 (A = Na和K)的热电特性。在1200 K时,计算出的ZT值分别为0.75和0.69,表明它们具有热电应用的潜力。此外,还计算了压力(0-15 GPa)和温度(0-1200 K)下的热力学性质。这些研究为这些材料的进一步应用提供了深刻的理解。这些结果突出了它们在光电器件应用方面的潜力,并有望鼓励对Li2ATlCl6 (A = Na和K)用于光学器件可行性的进一步实验研究。
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来源期刊
Materials Science and Engineering: B
Materials Science and Engineering: B 工程技术-材料科学:综合
CiteScore
5.60
自引率
2.80%
发文量
481
审稿时长
3.5 months
期刊介绍: The journal provides an international medium for the publication of theoretical and experimental studies and reviews related to the electronic, electrochemical, ionic, magnetic, optical, and biosensing properties of solid state materials in bulk, thin film and particulate forms. Papers dealing with synthesis, processing, characterization, structure, physical properties and computational aspects of nano-crystalline, crystalline, amorphous and glassy forms of ceramics, semiconductors, layered insertion compounds, low-dimensional compounds and systems, fast-ion conductors, polymers and dielectrics are viewed as suitable for publication. Articles focused on nano-structured aspects of these advanced solid-state materials will also be considered suitable.
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