Special Seminar: Complementary Strategies Across Length Scales to Mitigate Metal Halide Perovskite Instabilities

ZOOM LINK
Meeting ID: 961 8109 4666
Passcode: 005351

Metal halide perovskites are promising materials for next-generation optoelectronic applications, but chemical and mechanical instabilities remain barriers to commercial viability. I will discuss the efforts in my research group to address these instabilities through multiple complementary pathways. One approach of interest to address chemical instabilities is incorporating organic additives into the metal halide perovskites that can passivate undercoordinated surface sites. While there has been a large body of literature focused on defect passivation by additives, few design rules have been developed to date. We are attempting to better understand the interactions of passivating organic additives with metal halide perovskites and the influence of molecular structure and function in a generalizable approach.

Conversely, the extreme intrinsic fragility of perovskites is a challenge that must be addressed through other means. I will discuss the use of extrinsic approaches to improving the stability of perovskite thin films. In particular, I will highlight the strategy of nanocompositing with polymeric nanofibers developed by my group, which can increase the fracture energy by at least five-fold without a reduction in device performance. Finally, I will briefly discuss a novel printing approach being developed in my research group, which is anticipated to improve film quality and stability. Although there is currently no "one-size-fits-all" approach to fully address the instabilities in metal halide perovskites, complementary strategies can be developed to overcome these challenges.

Hosted by Professor Laura Ray.

About the Speaker(s)

Adam Printz
Assistant Professor of Chemical & Environmental Engineering, U Arizona

Adam Printz is an assistant professor at the University of Arizona in the departments of Chemical and Environmental Engineering and Materials Science and Engineering (by courtesy). He earned his PhD in nanoengineering from UCSD where his research focused on the microstructure of organic semiconductors and its effects on the mechanical properties of polymer and bulk heterojunction thin films. Following his PhD, he worked as a postdoctoral scholar in the Materials Science and Engineering department at Stanford University, focusing on improving the mechanical and chemical stability of perovskite solar cells. Printz has received the NSF CAREER and DOE Early Career Awards to support his group's research on understanding the fundamentals of scalable methods to improve material stability in thin-film solution-processed devices.

Contact

For more information, contact Ashley Parker at ashley.l.parker@dartmouth.edu.