Preparation method for bismuth titanate nanowire solar cells

Abstract

The invention belongs to the technical field of semiconductor materials, and in particular relates to a preparation method for bismuth titanate nanowire solar cells. By utilizing a BiFeO3 nanowire structure, the optical band gap is decreased and the absorption on sunshine is improved; the collection capacity of carriers is improved by utilizing Ag nanowires and electrodes on an ITO, so that the purpose of improving the photoelectricity conversion efficiency of the bismuth titanate nanowire solar cells can be achieved.

Description

technical field [0001] The invention belongs to the technical field of semiconductor materials, in particular to a BiFeO 3 Preparation method of nanowire solar cell. Background technique [0002] At present, traditional silicon-based solar cells use p-n junctions or Schottky junctions to separate electron-hole pairs, and the light-induced voltage is limited by the high energy barrier in the interface region, resulting in a small open-circuit voltage; secondly, in order to To improve the conversion efficiency of the cell, it is usually necessary to design a special anti-reflection structure and passivate the surface to increase the absorption of sunlight; more importantly, the price of silicon raw materials determines the manufacturing cost of silicon-based solar cells Expensive; therefore, silicon-based solar cells have disadvantages such as low open circuit voltage, complex structural design, and expensive manufacturing costs; however, another mechanism of photovoltaic eff...

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Problems solved by technology

[0003]In 2009, Choi et al. found that there is a large photovoltaic effect in the multiferroic material BiFeO3 single crystal, which has a narrow Optical bandgap (2.2 eV), high saturation polarization (90 μC / cm2), which makes the application of BiFeO3 materials in photovoltaic devices possible, However, the photocurrent density generated by it is small (7.35 μA / cm2), which directly leads to the low photoelectric conversion efficiency of BiFeO3 materials[T. Choi, S. Lee, Y. J. Choi, V. Kiryukhin, and S. W. Cheong, Science,324, 63 (2009).]; In addition, the research on the photovoltaic effect of BiFeO3 thin films shows that BiFeO3 The film has a wide optical band gap (around 2.7 eV) and a high open circuit voltage (0.3-0.9 V) [W. Ji, K. Yao, and Y. C. Liang, Adv. Mater. 22, 1763 (2010) . S. Y. Yang, L. W. Martin, S. J. Byrnes, T. E. Conry, S. R. Basu, D. Paran, L. Reichertz, J. Ihlefeld, C. Adamo, A. Melville, Y. H. Chu, C. H. Yang, J. L. Musfeldt, D. G. Schlom, J. W. Ager III, and R. Ramesh, Appl. Phys. Lett. 95, 062909 (2009).]; however, the BiFeO 3Optical Bandgap of Thin Films[K. Jiang, J. J. Zhu,J. D. Wu, J. Sun, Z. G. Hu, and J. H. Chu, ACS Applied Materials & Interfaces, 3, 4844 (2011). Z. Fu, Z. G. Yin, N. F. Chen, X. W. Zhang, H. Zhang, Y. M. Bai, and J. L. Wu, Phys. Status Solidi RRL , 6, 37 (2012).]; another study showed that the polycrystalline BiFeO3 film has a narrow optical bandgap (2.2 eV) and a large photocurrent density (2.8 mA / cm 2) [Y. Y. Zang, D. Xie, X. Wu, Y. Chen, Y. X. Lin, M. H. Li, H. Tian, ​​X. Li, Z. Li, H. W. Zhu, T. L. Ren, and D. Plant, Appl. Phys. Lett. 99, 132904 (2011).]; Electrode materials have a great influence on the optical properties of polycrystalline BiFeO3 thin films, polycrystalline BiFeO using oxide electrode materials 3Thin films have greater photovoltaic effect than metal materials [B. Chen, M. Li, Y. W. Liu, Z. H. Zuo, F. Zhuge, Q. F. Zhan, and R. W. Li, Nanotechnology, 22, 195201 (2011).]; In addition, studies on the optical properties of BiFeO3 nanowires also show that it has a lower optical bandgap (2.5 eV) [F. Gao, Y. Yuan, K. F. Wang, X. Y. Chen, F. Chen, J. M. Liu, and Z. F. Ren, Appl. Phys. Lett. 89, 102506 (2006).]; it can be seen that there have been many reports on the photovoltaic effect of BiFeO3 materials , but most of the BiFeO3 materials involved are bulk materials or thin film materials, and there are few reports on the optical properties of BiFeO3 with low-dimensional structures, although there are currently several The literature reports the preparation and optical properties of BiFeO3 nanowires, but only pure BiFeO3 nanowire arrays are involved. The open circuit voltage, photocurrent density The study of electrical properties has not been reported, let alone the report of BiFeO3 nanowire solar cells with other structures

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