关于举行香港城市大学任广禹（Alex Jen）教授学术报告的通知

报告题目：Molecular Engineering of Organic and Hybrid Materials for Highly Efficient and Stable Perovskites Solar Cells

报 告 人：任广禹 教授 （香港城市大学）

邀 请 人：黄飞 教授

报告时间：6月18日下午16:00-17:30

报告地点：北区发光材料与器件全国重点实验室501会议室

报告摘要：

A novel strategy has been developed to reduce the photovoltage loss of wide-bandgap (WBG) perovskite solar cells by constructing a localized 2D/3D perovskite heterojunction at the buried interface through intricate Lewis acid-base interaction between hole-selective self-assembled monolayer (SAM) and organic ammonium ligands. This not only significantly reduced defect density but also facilitated charge extraction and perovskite crystallization without compromising bulk optoelectrical properties of 3D perovskite. These led to a record Voc of 1.382 V for 1.79 eV-PSC, which exceeds 90% of its Shockley-Queisser limited value. The device retained 95% of its initial PCE (20.3%) after maximum power point tracking for over 700 h. By integrating this WBG PSC with an organic rear subcell, a perovskite-organic tandem cell was fabricated to achieve a record-high PCE of 27.11% (certified 26.3%).Regarding the development of regular bandgap PSCs, several novel interface and additive engineering approaches have been implemented, like polyoxometalates (POMs) and Ti-containing clusters to enable PSCs to achieve very high PCE (> 27%) and excellent stability. Moreover, new multifunctional redox additives have also been developed for their incorporation in Pb/Sn binary perovskite devices to overcome the crystallization and oxidation issues that strongly hinder the development of highly efficient and stable narrow bandgap PSCs. Their integration with a WBG perovskite subcell to form 2-T tandem devices has achieved a record-high PCE of 30.1% with good operational stability.