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Impedance Spectroscopy and Photovoltaic Effect of Oxygen Defect Engineering on KNbO 3 Ferroelectric Semiconductors
Journal of Electronic Materials ( IF 2.1 ) Pub Date : 2020-08-10 , DOI: 10.1007/s11664-020-08334-0
Fei Han , Yujie Zhang , Changlai Yuan , Xiao Liu , Baohua Zhu , Fei Liu , Liufang Meng , Jiang Wang , Changrong Zhou , Guanghui Rao

Perovskite-oxide (1 − x)KNbO3-xBaCo1/2Nb1/2O3−δ (KN-BCN; x = 0.00–0.20) ferroelectric semiconductor ceramics with oxygen defects are successfully prepared via a conventional solid-state sintering method. X-ray diffraction data indicate that the crystal symmetry evolves from orthogonal to tetragonal at increasing x values. Raman spectroscopic analysis confirms the long-range polarization of all compositions. X-ray photoelectron spectroscopy shows that the detailed chemical formula of 0.90KN-0.10BCN ceramics is 0.90KNbO3-0.10BaCo1/2Nb1/2O2.90. Room-temperature ferroelectricity weakens when the x value increases. The optical band gap narrows from 3.25 eV for x = 0.00 to 1.57 eV for x = 0.20, and the minimum value of ∼ 1.28 eV occurs in the 0.90KN-0.10BCN ceramic. Impedance analysis illustrates that the conduction mechanism of grains is mainly internal electron conduction, and that of the grain boundary is intrinsic conduction. The conducting mechanism of the ceramic system follows ohmic behavior by log I–log U curves. The maximum short-circuit photocurrent density and open-circuit photovoltage are 6.68 nA cm−2 and 0.80 V, and stable output is maintained. The KN-BCN ceramic system can be used in photovoltaic materials.



中文翻译:

氧缺陷工程对KNbO 3铁电半导体的阻抗谱和光伏效应

通过常规固态法成功制备了具有氧缺陷的钙钛矿型氧化物(1-  x)KNbO 3 - x BaCo 1/2 Nb 1/2 O3 (KN-BCN; x  = 0.00-0.20)烧结法。X射线衍射数据表明,随着x值的增加,晶体的对称性从正交演化为四方。拉曼光谱分析证实了所有成分的远距离极化。X射线光电子能谱表明0.90KN-0.10BCN陶瓷的详细化学式为0.90KNbO 3 -0.10BaCo 1/2 Nb 1/2 O 2.90。当x值增加时,室温铁电性减弱。光学带隙从x  = 0.00的3.25 eV缩小到x  = 0.20的1.57 eV ,并且在0.90KN-0.10BCN陶瓷中最小值达到1.28 eV。阻抗分析表明,晶粒的传导机制主要是内部电子传导,而晶界的传导机制是本征传导。陶瓷系统的导电机理遵循log I –log U曲线的欧姆行为。最大短路光电流密度和开路光电压为6.68 nA cm -2和0.80 V,并且维持稳定的输出。KN-BCN陶瓷系统可用于光伏材料。

更新日期:2020-08-11
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