河南大学李萌团队报道了具有增强界面化学稳定性的，高效锡铅钙钛矿太阳能电池的埋孔选择界面工程。相关研究成果发表在2024年12月4日出版的《科学通报》。

混合Sn-Pb钙钛矿因其窄带隙和由此产生的，全钙钛矿叠层太阳能电池的潜力而受到广泛关注。然而，传统的空穴传输材料可能会导致带失准，或在钙钛矿的埋入界面处引起退化。

该文中，研究人员设计了一种自组装材料4-（9H-咔唑-9-基）苯基硼酸（4PBA），用于基材的表面改性，作为空穴选择性接触。它结合了富含电子的咔唑基团和共轭苯基，这有助于产生可观的界面偶极矩，并调节基板的能级，以更好地与Sn-Pb钙钛矿能级对齐，从而促进空穴提取。

同时，增强的钙钛矿结晶和改善的钙钛矿底部接触，使钙钛矿块体和埋入界面内的缺陷最小化，抑制了非辐射复合。因此，使用4PBA的Sn-Pb钙钛矿太阳能电池的效率高达23.45%。值得注意的是，4PBA层提供了优异的界面化学稳定性，并有效地减轻了器件的退化。在货架储存2000小时后，未封装的设备保持了其初始效率的93.5%。

附：英文原文

Title: Buried hole-selective interface engineering for high-efficiency tin-lead perovskite solar cells with enhanced interfacial chemical stability

Author: Meng Li a

Issue&Volume: 2024/12/04

Abstract: Mixed Sn-Pb perovskites are attracting significant attention due to their narrow bandgap and consequent potential for all-perovskite tandem solar cells. However, the conventional hole transport materials can lead to band misalignment or induce degradation at the buried interface of perovskite. Here we designed a self-assembled material 4-(9H-carbozol-9-yl)phenylboronic acid (4PBA) for the surface modification of the substrate as the hole-selective contact. It incorporates an electron-rich carbazole group and conjugated phenyl group, which contribute to a substantial interfacial dipole moment and tune the substrate’s energy levels for better alignment with the Sn-Pb perovskite energy levels, thereby promoting hole extraction. Meanwhile, enhanced perovskite crystallization and improved contact at bottom of the perovskite minimized defects within perovskite bulk and at the buried interface, suppressing non-radiative recombination. Consequently, Sn-Pb perovskite solar cells using 4PBA achieved efficiencies of up to 23.45%. Remarkably, 4PBA layer provided superior interfacial chemical stability, and effectively mitigated device degradation. Unencapsulated devices retained 93.5% of their initial efficiency after 2000 h of shelf storage.

DOI: 10.1016/j.scib.2024.12.004

Source: https://www.sciencedirect.com/science/article/abs/pii/S2095927324008879