题 目： Unraveling the interfacial electronic properties to achieve high-performance optoelectronic electronics

报告人：Xianjie Liu（Laboratory of Organic Electronics (LOE), Department of Science and Technology (ITN),  Linköping University, Sweden）

时 间：2023年7月6日下午3点半

地 点：知新楼C座1111室

邀请人：康仕寿

摘 要：

Today, the power conversion efficiency of the emerging organic and hybrid inorganic solar cells has been reached rather high level due to the successful synthesis of new photoactive material, surface engineering, and new device architecture. Energy level alignment between the inorganic, organic, and electrode interface plays an essential key in understanding the interface energetics in photovoltaic devices. Here we first focus on the realistic interface properties of organic photoactive layer as prepared by e.g., spin-coating method, then try mapping the energy level alignment at the donor - acceptor interfaces in monolayer precision, especially, in the currently high-performance materials (e.g., PM6 and Y6). Moreover, near ambient pressure photoelectron spectroscopy is employed to shed light on environmental effects to these materials. Later, we discuss how surface engineering/passivation can improve the performance of perovskite solar cells upon the matched energy level between photoactive layer and electrodes.  Finally, the development of new technique to precisely probe the unoccupied states of these materials upon energy level alignment will be included before the summary.