主题：CALM TALK 201|Toward overcoming the stability and environmental challenges of organic and perovskite solar cells

主讲人：Zhe Li

时间：2025-12-12 15:00:00

地点：复材新大楼A212学术交流室

组织单位：先进低维材料中心

报告人介绍：

ZheLi is Reader (Professor) in Materials Science at the School of Engineering andMaterials Science, Queen Mary University of London. He received his Ph.D. fromCavendish Laboratory at University of Cambridge in 2012 and worked as aresearch associate/research fellow/junior group leader at Imperial CollegeLondon (2012–2015) and Swansea University (2015–2017), and as a lecturer ofEnergy Materials at School of Engineering, Cardiff University (2018–2019). Hismain research interest includes organic, perovskite, and quantum dot photovoltaiccells, including in emerging target applications, stability analysis, andadvanced materials and device characterisation.

报告摘要：

Emergingsemiconductors, particularly organic conjugated molecules and metal halideperovskites, are transforming the semiconductor industry and serving asfoundational materials for next-generation technologies, including solarpanels, displays, lighting, and sensing devices. In photovoltaics, perovskitesolar cells have already achieved an impressive power conversion efficiency of27%, while organic solar cells have surpassed 20%. However, despite theirremarkable device performance, several challenges still hinder large-scalecommercialisation.

Akey factor in realising the full commercial potential of organic solar cells isstability; a photovoltaic device must possess a sufficiently long lifespan toexceed the operational requirements of its intended application. The limitedstability of conventional fullerene-based organic solar cells has long beenrecognised as a major challenge, with multiple degradation mechanisms leadingto rapid performance losses under illumination, ambient exposure, and thermalstress. Nevertheless, the transition from fullerene to non-fullerene acceptors,alongside significant advances in molecular and device design, has openedexciting opportunities to fully address this issue.

Forperovskite solar cells, one of the most critical concerns is their potentiallyhigh ecotoxicity, primarily due to the use and subsequent leaching of excessiveamounts of lead into the environment over the product’s lifetime. How tominimise the risks of lead release from these materials into the environment withoutcompromising device performance remains a major challenge.

Inthis talk, I will summarize my group's recent research progress in addressingthe stability and environmental challenges of organic and perovskite materialsand solar cells. For organic solar cells, I will highlight the distinct rolesof donor and acceptor materials in degradation and propose potential strategiesto mitigate these degradation mechanisms. For perovskite solar cells, I willexamine the lead leaching mechanisms of halide perovskite materials undervarious environmental conditions and demonstrate how rational materials anddevice design can help overcome this challenge.