Regulation of the photovoltaic performance of TiO2@MAPbI3 core–shell nanowire arrays

Li Cheng; Shulin Xing; Jizhuang He; Yunfei He; Jiahua Li; Chunlin Fu

doi:10.1515/ijmr-2021-8450

Article

Regulation of the photovoltaic performance of TiO₂@MAPbI₃ core–shell nanowire arrays

Li Cheng , Shulin Xing , Jizhuang He , Yunfei He , Jiahua Li and Chunlin Fu

Published/Copyright: November 16, 2022

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From the journal International Journal of Materials Research Volume 113 Issue 12

Abstract

To further the exploration of perovskite nanowires, TiO₂@CH₃NH₃PbI₃ (TiO₂@MAPbI₃) core–shell nanowire arrays were successfully prepared via immersion and spin-coating methods. Because the shell thickness has a significant influence on the carrier transport capacity of nanowire arrays, different shell thicknesses were obtained by changing the precursor concentration. Subsequently, the relationship between the precursor concentration and shell thicknesses and the resulting properties of the nanowire arrays were investigated. The X-ray diffraction results showed that the prepared nanowire arrays consisted of only MAPbI₃, TiO₂, and fluorine-doped tin oxide phases, with no impurities. From the scanning electron microscopy and energy dispersive X-ray spectroscopy results, the MAPbI₃ shell material was successfully coated onto the core layer of the TiO₂ nanowire arrays. In addition, the average size of the core–shell nanowire arrays and the shell thickness were obtained using scanning electron microscopy and related software analyses. The results showed that the shell thickness was the largest (40 nm) when the precursor concentration was the lowest (0.025 mol L⁻¹). Ultraviolet–visible spectroscopy showed that when the precursor concentration was 0.025 mol L⁻¹ and the shell thickness was the largest, the nanowire array exhibited the highest absorbance and the smallest band gap, which is conducive to generating more carriers and improving its photovoltaic performance; the J–V curve showed the highest photoelectric conversion efficiency at this concentration and shell thickness. Therefore, it can be inferred that the shell thickness may affect the optical and photovoltaic properties. The relationship between the precursor concentration and thickness as well as the influence of this relationship on the properties of core–shell nanowire arrays should be further explored, to establish a foundation for the use of perovskite nanowires in the photovoltaic field.

Keywords: Core–shell structure; Nanowire; Property regulation

Corresponding author: Chunlin Fu, School of Metallurgical and Materials Engineering, Chongqing University of Science and Technology, Chongqing, 401331, P. R. China; and Chongqing Key Laboratory of Nano-Micro Composite Materials and Devices, Chongqing, 401331, P. R. China, E-mail: chlfu@126.com

Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: This study was supported by the Program for Creative Research Groups at the University of Chongqing (Grant No. CXQT19031), Scientific and Technological Research Program of Chongqing Municipal Education Commission (KJZD-M201901501), Natural Science Foundation Project of Chongqing, China (cstc2020jcyj-msxmX0030), Natural Science Foundation of Chongqing, China (cstc2020jcyj-zdxmX0008), and Special Project of Chongqing Technology Innovation and Application Development (cstc2020jscx-msxmX0218).
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2021-07-03

Accepted: 2022-07-15

Published Online: 2022-11-16

Published in Print: 2022-12-16

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Articles in the same Issue

https://doi.org/10.1515/ijmr-2021-8450

Keywords for this article

Core–shell structure; Nanowire; Property regulation