| La2Mo2O9掺杂钛酸铋钠铁电陶瓷的微观结构与光电性能 |
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| 引用本文： | 汤海佩,周昌荣,姚凯,谭云川,钟明强,袁昌来.La2Mo2O9掺杂钛酸铋钠铁电陶瓷的微观结构与光电性能[J].硅酸盐通报,2021,40(4):1361-1369. |
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| 作者姓名： | 汤海佩 周昌荣 姚凯 谭云川 钟明强 袁昌来 |
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| 作者单位： | 桂林电子科技大学材料科学与工程学院,桂林 541004;桂林电子科技大学材料科学与工程学院,桂林 541004;桂林电子科技大学,广西信息材料重点实验室,桂林 541004 |
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| 基金项目： | 国家自然科学基金(51862004);广西壮族自治区自然科学基金(2018GXNSFAA294039,2017GXNSFDA198024) |
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| 摘 要： | 铁电陶瓷的极化内建电场可分离光生载流子并有效降低载流子间的复合率,但是其高带隙限制了对光的吸收。本文以具有良好铁电性能的Bi0.5Na0.5TiO3(BNT)陶瓷为基体,通过掺杂La2Mo2O9降低光学带隙,提高光电流密度。样品使用传统固相法制备,随后分析了此陶瓷的XRD、拉曼、光吸收、光电流、铁电和介电性质。结果表明,La2Mo2O9掺杂能显著提高光吸收强度,随其含量增加,光学带隙值先明显下降,然后缓慢增加。在掺杂含量为0.7%(摩尔分数)时,陶瓷的带隙值最低为1.57 eV,远低于纯BNT陶瓷的2.9 eV,对应的最大光电流密度和开路电压为71.06 nA/cm2和4.40 V,得到的最大输出功率为312.7 nW/cm2,并且随时间增加变化不大,同时保持很好的铁电性能。研究结果表明,La2Mo2O9改性BNT铁电陶瓷是一种非常有前景的铁电光伏材料。
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| 关 键 词： | 铁电陶瓷 光生载流子 La2Mo2O9 光学带隙 光电流 铁电光伏材料 |
| 收稿时间： | 2020-12-30 |
Microstructure and Optical Properties of La2Mo2O9 Doped Sodium Bismuth Titanate Ferroelectric Ceramics |
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| TANG Haipei,ZHOU Changrong,YAO Kai,TAN Yunchuan,ZHONG Mingqiang,YUAN Changlai.Microstructure and Optical Properties of La2Mo2O9 Doped Sodium Bismuth Titanate Ferroelectric Ceramics[J].Bulletin of the Chinese Ceramic Society,2021,40(4):1361-1369. |
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| Authors: | TANG Haipei ZHOU Changrong YAO Kai TAN Yunchuan ZHONG Mingqiang YUAN Changlai |
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| Affiliation: | 1. School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China;2. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China |
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| Abstract: | An internal electric field is created by the polarization of the ferroelectric ceramics, which separates photogenerated carriers and effectively reduces the recombination rate of carriers. However, the light absorption is limited by wide band gap of ferroelectric ceramics, so the further development of ferroelectric ceramics in the field of photovoltaic is hindered. In this paper, doping La2Mo2O9 into Bi0.5Na0.5TiO3 (BNT) ceramics with good ferroelectricity, to reduce the optical band gap and increase the photocurrent density. The samples were prepared by the conventional solid-phase synthesis method, and the XRD, Raman, light absorption, photocurrent, ferroelectric and dielectric properties of the ceramics were analyzed. The results show that the La2Mo2O9 doping significantly increases the light absorption intensity. As the content of La2Mo2O9 doping increases, the optical band gap first decreases significantly, and then slowly increases. The BNT-xLM ceramics with x=0.7% (mole fraction) exhibits the minimum optical band gap values with 1.57 eV, which is much lower than the 2.9 eV of pure BNT ceramics. The corresponding maximum photocurrent density and open circuit voltage are 71.06 nA/cm2 and 4.40 V respectively, and the maximum output power obtained is 312.7 nW/cm2, as well as the variation, is small with time maintaining excellent ferroelectricity. The research results show that La2Mo2O9 modified BNT ferroelectric ceramics is a very promising ferroelectric photovoltaic material. |
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| Keywords: | ferroelectric ceramics photogenerated carrier La2Mo2O9 optical band gap photocurrent ferroelectric photovoltaic material |
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