Zhaoning Song

Aug 14, 2024 | nature.com | Chongwen Li |Fangyuan Jiang |Zhaoning Song |Xiaoming Wang |Adam Balvanz |Esma Ugur | +18 more

AbstractPerovskite tandem solar cells show promising performance, but non-radiative recombination and its progressive worsening with time, especially in the mixed Sn–Pb low-bandgap layer, limit performance and stability. Here we find that mixed Sn–Pb perovskite thin films exhibit a compositional gradient, with an excess of Sn on the surface—and we show this gradient exacerbates oxidation and increases the recombination rate.

Mar 5, 2024 | nature.com | Jian Xu |Zhaoning Song |Hao Chen |Yanfa Yan |Bin Lin Chen

AbstractSurface defects in semiconducting materials, though they have been widely studied, remain a prominent source of loss in optoelectronic devices; here we sought a new angle of approach, looking into the dynamic roles played by surface defects under atmospheric stressors and their chemical passivants in the lifetime of optoelectronic materials. We find that surface defects possess properties distinct from those of bulk defects.

Mar 28, 2023 | nature.com | Zaiwei Wang |Hao Chen |Dominik J. Kubicki |Esma Ugur |Guang Yang |Deying Luo | +10 more

Author notes These authors contributed equally: Zaiwei Wang, Lewei Zeng, Tong Zhu, Hao Chen Authors and Affiliations Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario, Canada Zaiwei Wang, Lewei Zeng, Tong Zhu, Hao Chen, Bin Chen, Chongwen Li, Aidan Maxwell, Junke Wang, Sam Teale, Suhas Mahesh, Sasa Wang, Shuangyan Hu, Euidae Jung, Mingyang Wei, So Min Park, Luke Grater & Edward Sargent Department of Chemistry, Northwestern...