Doped barium titanate for enhanced ferroelectric photovoltaic performance

IF 2 4区材料科学 Q3 MATERIALS SCIENCE, COATINGS & FILMS

Thin Solid Films Pub Date : 2025-10-20 DOI:10.1016/j.tsf.2025.140815

Shi Xuan Jia , Lei Wang , Ye Feng Wang , Tian-Yi Hu , Ke Zhen Hui , Jing Hui Zeng

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Abstract

The carrier mobility of barium titanate (BaTiO₃) with perovskite structure leads to its insulating characteristics and low power conversion efficiency as a ferroelectric photovoltaic device. To solve this problem, both A-site La-doped and B-site Mn-Nb co-doped BaTiO₃ photovoltaic thin film devices have been prepared. Their UV-Visible spectra revealed that as the doping content increases, the bandgap gradually decreases. From the XPS study, La-doping and Mn-Nb co-dopingof BTO can both increase the presence of oxygen vacancies in the BaTiO₃, which is beneficial to its conductivity and mobility as a result of charge compensation. The reduction of the bandgap and the improvement of the conductivity result in a large short-current density 58 μA·cm^-2 for Mn-Nb co-doped BTO. This work shows that the performance of ferroelectric photovoltaics can be effectively improved by A-site or B-site doping that improves electrical conductivity and light absorption.

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掺杂钛酸钡增强铁电光伏性能

具有钙钛矿结构的钛酸钡（BaTiO3）的载流子迁移率决定了其作为铁电光伏器件的绝缘特性和低功率转换效率。为了解决这一问题，制备了a位la掺杂和b位Mn-Nb共掺杂的BaTiO3光伏薄膜器件。紫外可见光谱显示，随着掺杂含量的增加，带隙逐渐减小。从XPS研究来看，BTO的la掺杂和Mn-Nb共掺杂都可以增加BaTiO3中氧空位的存在，这有利于BaTiO3的电导率和迁移率。带隙的减小和电导率的提高使Mn-Nb共掺杂BTO的短电流密度达到58 μA·cm-2。这项工作表明，通过a位或b位掺杂可以有效地改善铁电光伏的性能，从而提高电导率和光吸收。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Thin Solid Films 工程技术-材料科学：膜

CiteScore

4.00

自引率

4.80%

发文量

381

审稿时长

7.5 months

期刊介绍： Thin Solid Films is an international journal which serves scientists and engineers working in the fields of thin-film synthesis, characterization, and applications. The field of thin films, which can be defined as the confluence of materials science, surface science, and applied physics, has become an identifiable unified discipline of scientific endeavor.