Recombination suppression in TiO₂/boron-doped reduced graphene oxide-based dye-sensitized solar cells

IF 16.3 1区工程技术 Q1 ENERGY & FUELS

Renewable and Sustainable Energy Reviews Pub Date : 2024-11-11 DOI:10.1016/j.rser.2024.115088

Savisha Mahalingam , Abreeza Manap , Kam Sheng Lau , Ramisha Rabeya , Chin Hua Chia , Kai Xue , Puvaneswaran Chelvanathan

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Abstract

Fundamental operational principles of photoanode-based-dye-sensitized solar cells (DSSC) remain elusive. The modification in photoanodes affects the overall DSSC performance due to the behavioral changes in charge transport. In this work, we control the precursor concentrations to fabricate a boron-reduced graphene oxide (B-rGO) series with varied amounts of photoanodes. The DSSC incorporating 0.2 wt% B-rGO exhibits the highest efficiency and EQE, surpassing both lower and higher B-rGO concentrations. Electrochemical impedance spectroscopy reveals the lowest charge transfer resistance for the 0.2 wt% B-rGO DSSC, suggesting suppressed recombination processes. However, the observed trend in electron lifetime (longest for the reference DSSC and decreasing with B-rGO concentration) suggests the potential introduction of electron trapping sites even at low B-rGO levels. The optimal B-rGO concentration (0.2 wt%) facilitates efficient electron transfer from the excited dye to the TiO₂ conduction band, potentially enhancing light scattering or suppressing recombination.

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基于 TiO₂/硼掺杂还原氧化石墨烯的染料敏化太阳能电池中的重组抑制作用

基于光阳极的染料敏化太阳能电池（DSSC）的基本工作原理仍未阐明。由于电荷传输的行为变化，光阳极的改性会影响 DSSC 的整体性能。在这项工作中，我们控制了前驱体的浓度，制造出了具有不同数量光阳极的硼还原氧化石墨烯（B-rGO）系列。含有 0.2 wt% B-rGO 的 DSSC 显示出最高的效率和 EQE，超过了较低和较高浓度的 B-rGO。电化学阻抗光谱显示，0.2 wt% B-rGO DSSC 的电荷转移电阻最低，表明重组过程受到抑制。然而，观察到的电子寿命趋势（参考 DSSC 的电子寿命最长，随着 B-rGO 浓度的增加而缩短）表明，即使在 B-rGO 浓度较低的情况下，也有可能引入电子捕获点。最佳的 B-rGO 浓度（0.2 wt%）可促进电子从激发染料向二氧化钛导带的有效转移，从而增强光散射或抑制重组。

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

Renewable and Sustainable Energy Reviews 工程技术-能源与燃料

CiteScore

31.20

自引率

5.70%

发文量

1055

审稿时长

62 days

期刊介绍： The mission of Renewable and Sustainable Energy Reviews is to disseminate the most compelling and pertinent critical insights in renewable and sustainable energy, fostering collaboration among the research community, private sector, and policy and decision makers. The journal aims to exchange challenges, solutions, innovative concepts, and technologies, contributing to sustainable development, the transition to a low-carbon future, and the attainment of emissions targets outlined by the United Nations Framework Convention on Climate Change. Renewable and Sustainable Energy Reviews publishes a diverse range of content, including review papers, original research, case studies, and analyses of new technologies, all featuring a substantial review component such as critique, comparison, or analysis. Introducing a distinctive paper type, Expert Insights, the journal presents commissioned mini-reviews authored by field leaders, addressing topics of significant interest. Case studies undergo consideration only if they showcase the work's applicability to other regions or contribute valuable insights to the broader field of renewable and sustainable energy. Notably, a bibliographic or literature review lacking critical analysis is deemed unsuitable for publication.