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Several Triazine-Based Small Molecules Assisted in the Preparation of High-Performance and Stable Perovskite Solar Cells by Trap Passivation and Heterojunction Engineering
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-01-31 , DOI: 10.1021/acsami.1c21081 Yapeng Sun 1 , Jiankai Zhang 1 , Huangzhong Yu 1, 2 , Chengwen Huang 1 , Jinzhen Huang 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-01-31 , DOI: 10.1021/acsami.1c21081 Yapeng Sun 1 , Jiankai Zhang 1 , Huangzhong Yu 1, 2 , Chengwen Huang 1 , Jinzhen Huang 1
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The functional group is the main body in modifying the perovskite film, and different functional groups lead to different modification effects. Here, several conjugated triazine-based small molecules such as melamine (Cy-NH2), cyanuric acid (Cy-OH), cyanuric fluoride (Cy-F), cyanuric chloride (Cy-Cl), and thiocyanuric acid (Cy-SH) are used to modify perovskite films by mixing in antisolvent. The crystallizations of perovskites are optimized by these molecules, and the perovskite films with low trap density are obtained by forming Lewis adducts with these molecules (Pb2+ and electron-donating groups including −NH2, C═N–, and C═O; I– and electron-withdrawing groups including F, Cl, N–H, and O–H). Especially for the Cy-F and Cy-Cl, the heterojunction structure is formed in the perovskite layer by p-type modification, which is conducive to charge transfer and collection in PSCs. Compared with that of control devices, the performance of devices with trap passivation and heterojunction engineering is obviously improved from 18.49 to 20.71% for MAPbI3 and 19.27 to 21.11% for FA0.85Cs0.15PbI3. Notably, the excellent moisture (retaining 67%, RH: 50% for 20 days) and thermal (retaining 64%, 85 °C for 72 h) stability of PSCs are obtained by a kind of second modification (Cy-F/Cy-SH)─spin-coating a few Cy-SH on the Cy-F-modified perovskite film surface. It also reduces Pb pollution because Cy-SH is a highly potent chelating agent. Therefore, this work also provides an effective method to obtain high-performance, stable, and low-lead pollution PSCs, combining trap passivation, heterojunction engineering, and surface treatment.
中文翻译：
几种三嗪基小分子通过陷阱钝化和异质结工程辅助制备高性能稳定的钙钛矿太阳能电池
官能团是钙钛矿薄膜改性的主体，不同的官能团导致不同的改性效果。在这里，几种基于共轭三嗪的小分子如三聚氰胺（Cy-NH 2）、氰尿酸（Cy-OH）、氰尿酸（Cy-F）、氰尿酸（Cy-Cl）和硫氰尿酸（Cy-SH ) 用于通过混合反溶剂来改性钙钛矿薄膜。这些分子优化了钙钛矿的结晶，通过与这些分子（Pb 2+和包括-NH 2 、C=N-和C=O的给电子基团）形成路易斯加合物获得了低陷阱密度的钙钛矿薄膜。 ; 我——和吸电子基团，包括 F、Cl、N-H 和 O-H）。特别是对于Cy-F和Cy-Cl，通过p型修饰在钙钛矿层中形成异质结结构，有利于PSC中的电荷转移和收集。与对照器件相比，陷阱钝化和异质结工程器件的性能明显提高，MAPbI 3 由 18.49% 提高到 20.71%，FA 0.85 Cs 0.15 PbI 3由19.27 %提高到21.11%. 值得注意的是，通过一种二次改性（Cy-F/Cy- SH)─在Cy-F修饰的钙钛矿薄膜表面旋涂少量Cy-SH。它还可以减少铅污染，因为 Cy-SH 是一种高效螯合剂。因此，本工作也提供了一种结合陷阱钝化、异质结工程和表面处理获得高性能、稳定、低铅污染的PSC的有效方法。
更新日期：2022-02-09
中文翻译：
几种三嗪基小分子通过陷阱钝化和异质结工程辅助制备高性能稳定的钙钛矿太阳能电池
官能团是钙钛矿薄膜改性的主体，不同的官能团导致不同的改性效果。在这里，几种基于共轭三嗪的小分子如三聚氰胺（Cy-NH 2）、氰尿酸（Cy-OH）、氰尿酸（Cy-F）、氰尿酸（Cy-Cl）和硫氰尿酸（Cy-SH ) 用于通过混合反溶剂来改性钙钛矿薄膜。这些分子优化了钙钛矿的结晶，通过与这些分子（Pb 2+和包括-NH 2 、C=N-和C=O的给电子基团）形成路易斯加合物获得了低陷阱密度的钙钛矿薄膜。 ; 我——和吸电子基团，包括 F、Cl、N-H 和 O-H）。特别是对于Cy-F和Cy-Cl，通过p型修饰在钙钛矿层中形成异质结结构，有利于PSC中的电荷转移和收集。与对照器件相比，陷阱钝化和异质结工程器件的性能明显提高，MAPbI 3 由 18.49% 提高到 20.71%，FA 0.85 Cs 0.15 PbI 3由19.27 %提高到21.11%. 值得注意的是，通过一种二次改性（Cy-F/Cy- SH)─在Cy-F修饰的钙钛矿薄膜表面旋涂少量Cy-SH。它还可以减少铅污染，因为 Cy-SH 是一种高效螯合剂。因此，本工作也提供了一种结合陷阱钝化、异质结工程和表面处理获得高性能、稳定、低铅污染的PSC的有效方法。
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