My research project

My qualifications

MSci Chemistry
Imperial College London

My teaching

My publications

Publications

Li Bowei, Xiang Yuren, Imalka Jayawardena K.D.G., Luo Deying, Wang Zhuo, Yang Xiaoyu, Watts John F., Hinder Steven, Sajjad Muhammad T., Webb Thomas, Luo Haitian, Marko Igor, Li Hui, Thomson Stuart A.J., Zhu Rui, Shao Guosheng, Sweeney Stephen J., Silva S. Ravi P., Zhang Wei (2020) Reduced bilateral recombination by functional molecular interface engineering for efficient inverted perovskite solar cells,Nano Energy 105249 Elsevier
Interface-mediated recombination losses between perovskite and charge transport layers are one of the main reasons that limit the device performance, in particular for the open-circuit voltage (VOC) of perovskite solar cells (PSCs). Here, functional molecular interface engineering (FMIE) is employed to retard the interfacial recombination losses. The FMIE is a facile solution-processed means that introducing functional molecules, the fluorene-based conjugated polyelectrolyte (CPE) and organic halide salt (OHS) on both contacts of the perovskite absorber layer. Through the FMIE, the champion PSCs with an inverted planar heterojunction structure show a remarkable high VOC of 1.18 V whilst maintaining a fill factor (FF) of 0.83, both of which result in improved power conversion efficiencies (PCEs) of 21.33% (with stabilized PCEs of 21.01%). In addition to achieving one of the highest PCEs in the inverted PSCs, the results also highlight the synergistic effect of these two molecules in improving device performance. Therefore, the study provides a straightforward avenue to fabricate highly efficient inverted PSCs.