Cheng Li

Perovskite & Organic devices

School of Electronic Science and Engineering, Xiamen University, Xiamen, China

Email: chengli@xmu.edu.cn

Biography

Cheng Li received his Bachelor and Master degree from Physics Department at Nanjing University under the guidance of Prof. Shining Zhu and his Ph.D degree from Cavendish Laboratory, University of Cambridge, under the guidance of Prof. Neil Greenham. Upon graduation, he spent 5 years at Department of Chemistry, University of Bayreuth, Germany as a postdoc researcher. Currently he is a professor at School of Electronic Science and Engineering, Xiamen University. In addition, he also works at Future Display Institute of Xiamen. He has published more than 40 papers and applied 5 patents. His research focus is on the decay mechanism of novel semiconductor devices, which he investigates using various in-situ optoelectronic characterization methods, e.g. photoluminescence imaging microscopy, electroabsorption spectroscopy and impedance spectroscopy.

Abstract for Presentation

Real-time Observation of Ion Migration in Perovskite and Its Influence on Device Stability

Organic–inorganic perovskites (e.g., CH3NH3PbI3) have demonstrated as a promising optoelectronic material in both solar cells and light emitting diodes. However, device stability is still the main problem to hinder its large-scale application. More and more evidences indicate the influence of ion migration on PL intensity, device performance and stability. In this work, we investigate the electric/light field induced behavior in perovskite films in-situ, by employing photoluminescence (PL) microscopy to obtain both the spatially- and temporally-resolved PL images simultaneously. The formation of PL inactive domains is ascribed to the migration of iodide ions under external fields. Hence, we are able to characterize the kinetic processes and determine the drift velocities of these ions quantitively.

References

[1] B. Hu, J. Zhang, Z. Guo, L. Lu, P. Li, M. Chen*, and C. Li*, ACS Appl. Mater. Interfaces 14 (2022) 15840

[2] Y. Zhong, D. Seeberger, E. M. Herzig, A. Köhler, F. Panzer*, C. Li*, and S. Huettner*, ACS Appl. Mater. Interfaces13 (2021) 45365 [3] Y. Zhong, M. Hufnagel, M. Thelakkat, C. Li*, S. Huettner*, Adv. Funct. Mater. 30 (2020)1908920

[4] J. Zhang, C. Li*, M. Chen*, K. Huang*, J. Phys. D: Appl. Phys. 2021, 54 (2021) 044002

[5] S. Bai*, P. Da, C. Li, Z. Wang, Z. Yuan, F. Fu, M. Kawecki, X. Liu, N. Sakai, J. T.-W. Wang, S. Huettner, S. Buecheler, M. Fahlman, F. Gao*, H. J. Snaith*, Nature 571 (2019) 245.