MXene 驱动的空穴选择性自组装单层界面增强技术,用于高效稳定的 pi-n 型过氧化物太阳能电池

IF 10.7 2区 材料科学 Q1 CHEMISTRY, PHYSICAL Journal of Materials Chemistry A Pub Date : 2024-11-28 DOI:10.1039/d4ta07117d
Kyeong Su Kim, Jung Jae Do, Jae Woong Jung
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引用次数: 0

摘要

平面 pi-n 结构器件中的空穴选择性界面具有多方面的作用,它可以作为生长包晶吸收层的稳固基底,促进有效的空穴载流子萃取,并抑制与电子传输相关的重组。然而,作为一个埋藏界面,它仍然是非暴露的,其特点是电子状态不明确,并且在包晶吸收层和铟锡氧化物阳极交界处存在大量有缺陷的反相物。虽然自组装单层(SAM)已被提出作为独立的空穴选择性界面,但其有限的电学特性无法完全满足高性能 pi-i-n 包晶体太阳能电池(PSC)的要求。在本研究中,我们用 MXene(Ti3C2Tx)纳米片对基于 SAM 的空穴选择性界面进行了功能化处理,从而提高了导电性、阳极功函数和表面特性,缓解了与埋入式界面相关的挑战。MXene 纳米片的集成促进了载流子的高效传输,降低了过氧化物界面的界面陷阱密度,并在抑制非辐射重组的同时提高了薄膜质量。因此,在基于 SAM 的空穴选择性界面中加入 MXene 能显著提高基于 CsFAPbI3 的 pi-n 包晶体太阳能电池的功率转换效率(PCE),从 20.86% 提高到 23.25%。此外,MXene 纳米片还增加了 SAM/ITO 表面的疏水性,使器件在环境条件下 800 小时内仍能保持 91% 以上的初始 PCE。这些发现强调了 MXene 作为设计空穴选择性掩埋界面的新型成分的潜力,为大幅提高 pi-n PSC 的光伏性能和长期稳定性铺平了道路。
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MXene-Driven Augmentation of Hole-Selective Self-Assembled Monolayer Interfaces for Efficient and Stable p-i-n Perovskite Solar Cells
The hole-selective interface in planar p-i-n architecture devices serves a multifaceted role, functioning as a robust substrate for the growth of perovskite absorber layers, facilitating efficient hole-carrier extraction, and suppressing electron transport-related recombination. However, as a buried interface, it remains non-exposed, characterized by ambiguous electronic states and a significant presence of defective antisites at the perovskite absorber and indium tin oxide anode junctions. Although self-assembled monolayers (SAMs) have been proposed as standalone hole-selective interfaces, their limited electrical properties fail to fully meet the demands of high-performance p-i-n perovskite solar cells (PSCs). In this study, we functionalize the SAM-based hole-selective interface with MXene (Ti3C2Tx) nanosheets, thereby enhancing electrical conductivity, anode work function, and surface properties to mitigate the challenges associated with the buried interface. The integration of MXene nanosheets promotes efficient carrier transport, reduces interfacial trap density at the perovskite interfaces, and improves film quality while suppressing non-radiative recombination. As a result, the inclusion of MXene in the SAM-based hole-selective interface significantly enhances the power conversion efficiency (PCE) from 20.86% to 23.25% in CsFAPbI3-based p-i-n perovskite solar cells. Moreover, the MXene nanosheets contribute to increased hydrophobicity of the SAM/ITO surface, enabling the device to retain over 91% of its initial PCE under ambient conditions for 800 hours. These findings underscore the potential of MXene as a novel component in the design of hole-selective buried interfaces, paving the way for substantial improvements in both photovoltaic performance and long-term stability of p-i-n PSCs.
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来源期刊
Journal of Materials Chemistry A
Journal of Materials Chemistry A CHEMISTRY, PHYSICAL-ENERGY & FUELS
CiteScore
19.50
自引率
5.00%
发文量
1892
审稿时长
1.5 months
期刊介绍: The Journal of Materials Chemistry A, B & C covers a wide range of high-quality studies in the field of materials chemistry, with each section focusing on specific applications of the materials studied. Journal of Materials Chemistry A emphasizes applications in energy and sustainability, including topics such as artificial photosynthesis, batteries, and fuel cells. Journal of Materials Chemistry B focuses on applications in biology and medicine, while Journal of Materials Chemistry C covers applications in optical, magnetic, and electronic devices. Example topic areas within the scope of Journal of Materials Chemistry A include catalysis, green/sustainable materials, sensors, and water treatment, among others.
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