反式钙钛矿太阳能电池中乙酰丙酮铈界面缓冲层的研究

doi:10.15541/jim20260112

摘要/Abstract

摘要： 反式钙钛矿太阳能电池(PSCs)因快速增长的效率、低温制备工艺以及低成本等特点备受关注,但溶液法制备的氧化锡(SnO₂)电子传输层(ETL)往往存在表面孔洞和界面接触不佳等问题,导致界面非辐射复合加剧,限制了器件性能的进一步提升。本研究在溶液法制备的SnO₂ ETL与银电极之间引入乙酰丙酮铈(Ce(acac)₃)作为界面缓冲层。实验结果表明,Ce(acac)₃能够有效覆盖并平整SnO₂表面,构建连续致密的界面层。同时,改进后的SnO₂薄膜表面功函数降低,界面电子提取势垒减小,非辐射复合受到抑制,载流子提取和传输性能得到优化。最终,PSCs的光电转换效率(PCE)从20.33%提升至22.85%,优于传统浴铜灵(BCP)缓冲层器件的20.95%;此外,未封装器件在空气环境中放置1000 h后仍能保持初始效率的85%以上。本研究通过引入Ce(acac)₃作为无机界面缓冲层,实现了界面形貌和化学特性的共同优化,为全溶液法制备高效稳定反式钙钛矿太阳能电池奠定了基础。

关键词: 反式钙钛矿太阳能电池, 乙酰丙酮铈, SnO₂电子传输层, 界面缓冲层

Abstract: Inverted perovskite solar cells (PSCs) have garnered significant attention due to their rapidly increasing efficiency, low-temperature fabrication process, and low cost. However, solution-processed tin oxide (SnO₂) electron transport layers (ETLs) often suffer from surface pinholes and poor interfacial contact, which aggravate interfacial non-radiative recombination and limit further performance improvement. In this work, cerium acetylacetonate (Ce(acac)₃) was introduced as an interfacial buffer layer between the solution-processed SnO₂ ETL and the Ag electrode. Ce(acac)₃ effectively covers and planarizes the SnO₂ surface, forming a continuous and dense interfacial layer. Furthermore, the modified SnO₂ films exhibit a decreased work function, leading to a reduced electron extraction barrier at the interface. This effectively suppresses non-radiative recombination and optimizes charge carrier extraction and transport. Consequently, the power conversion efficiency (PCE) of the PSC is enhanced from 20.33% to 22.85%, outperforming the conventional bathocuproine (BCP) buffer layer-based device (20.95%). Moreover, unencapsulated devices retain over 85% of the initial efficiency after 1000 h of storage in ambient air. This work demonstrates that introducing Ce(acac)₃ as an inorganic interfacial buffer layer enables optimization of interfacial morphology and chemical properties, paving the way for fabricating fully solution‑processed, highly efficient and stable inverted PSCs.

Key words: inverted perovskite solar cell, cerium acetylacetonate, SnO₂ electron transport layer, interfacial buffer layer

中图分类号:

TQ174

解鑫倩, 洪祥, 杨松旺. 反式钙钛矿太阳能电池中乙酰丙酮铈界面缓冲层的研究[J]. 无机材料学报, DOI: 10.15541/jim20260112.

XIE Xinqian, HONG Xiang, YANG Songwang. Cerium Acetylacetonate Interfacial Buffer Layer for Inverted Perovskite Solar Cells[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20260112.

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