Abstract
Detrimental defects on perovskite grain boundaries (GBs) are critical factors that lead to non-radiative recombination and hysteresis. In this work, triazine-graph-diyne (Tra-GD), a nitrogen-rich two-dimensional (2D) material, was incorporated into the active layer of perovskite to modify the GBs. Tra-GD was found to distribute evenly over the bulk of the perovskite and has a strong interaction with the Pb2+ exposed at GBs, which enables it to effectively passivate GB defects and prevent ion migration. The results of Kelvin probe force microscopy and photoluminescence studies proved that the highly conjugated Tra-GD located at GBs could promote charge extraction and transport. Benefiting from defect passivation and more efficient carrier transport, the Tra-GD based device showed less non-radiative recombination loss. Consequently, the resultant device presented negligible hysteresis and yielded a high power conversion efficiency (PCE) of 20.33% in the MAPbI3-based perovskite solar cell. This approach was extended to the FAPbI3 system with a PCE of 21.16%. Our Tra-GD passivation strategy provides a useful approach to effectively improving the device performance and addressing hysteresis issues.
摘要
钙钛矿晶界处的缺陷是造成非辐射复合和迟滞效应的主要原因. 在本工作中, 我们将三嗪石墨炔(一种富氮的碳材料)引入到钙钛矿中钝化晶界缺陷. 实验结果表明, 三嗪石墨炔能够均匀地分散于钙钛矿体相中, 并且和晶界处暴露的Pb2+发生强相互作用, 这确保了三嗪石墨炔能够有效地钝化晶界, 防止晶界离子迁移. 开尔文电镜和荧光分析证明高度共轭的三嗪石墨炔存在于晶界处, 有利于载流子的提取和传输. 得益于晶界缺陷的钝化和高效的载流子传输, 基于三嗪石墨炔的钙钛矿太阳能电池展现了更小的非辐射复合. 因此, 三嗪石墨炔优化后的MAPbI3器件光电转换效率为 20.33%, 迟滞效应可以忽略不计. 同样地, 将三嗪石墨炔的钝化方法拓展至FAPbI3器件中, 得到了21.16%的最佳效率. 本文展现的三嗪石墨炔钝化晶界缺陷的方法能够有效提升钙钛矿太阳能电池的性能和抑制迟滞效应.
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Chen S conducted the experiments; Pan Q synthesized the Tra-GD; Chen S, Pan Q and Guo X performed the characterizations; Chen S, Jiu T, Zhao C wrote and revised the paper; Jiu T, Zhao Y provided the ideas; Li J provided the suggestions. All authors contributed to the general discussion.
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Siqi Chen received his bachelor’s degree in polymer material engineering in 2017 and is currently a graduate student in Qingdao University of Science and Technology, dedicated to research of perovskite solar cell engineering.
Tonggang Jiu obtained his PhD in chemistry from Chinese Academy of Sciences (CAS) in 2006. Currently Prof. Jiu serves as the head of carbon based energy conversion materials group at Qingdao Institute of Bioenergy and Bioprocess Technology, CAS. His research interests mainly focus on inorganic nanomaterials and solar cells based on novel 2D carbon materials of graph-diyne.
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Chen, S., Pan, Q., Li, J. et al. Grain boundary passivation with triazine-graphdiyne to improve perovskite solar cell performance. Sci. China Mater. 63, 2465–2476 (2020). https://doi.org/10.1007/s40843-020-1324-8
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DOI: https://doi.org/10.1007/s40843-020-1324-8