Understanding the role of nanoscale defect clusters in hybrid perovskite photovoltaics with time-resolved photoemission electron microscopy
Keshav Dani a
a Femtosecond Spectroscopy Unit, Okinawa Institute of Science and Technology Graduate University, Onna, Okinawa, 904 0495, Japan
Materials for Sustainable Development Conference (MATSUS)
Proceedings of nanoGe Spring Meeting 2022 (NSM22)
#PhotoPero22. Photophysics of Halide Perovskites and Related Materials - from Bulk to Nano
Online, Spain, 2022 March 7th - 11th
Organizers: Sascha Feldmann, Annamaria Petrozza and Ajay Ram Srimath Kandada
Invited Speaker, Keshav Dani, presentation 142
DOI: https://doi.org/10.29363/nanoge.nsm.2022.142
Publication date: 7th February 2022

Hybrid perovskite photovoltaic devices have rapidly emerged as promising contenders for next generation, low-cost solar cell technology. Yet, the presence of defect states critically impacts device operation, including device efficiency and potentially long-term stability. Understanding the nature of these defects and their role in photocarrier trapping, requires techniques that are capable of probing ultrafast photocarrier dynamics at the nanoscale.

            In this talk, I will discuss the development of time-resolved photoemission electron microscopy (TR PEEM) techniques in my lab [1], [2], applied to hybrid perovskite solar materials. Thereby, we directly visualize the presence of the performance limiting nanoscale defect clusters and elucidate the role of diffusion in the charge carrier trapping process [3]. By correlating PEEM measurements with other spatially resolved microscopies, we identify different types of defects that form, and study how passivation strategies may have a varied impact on them [4].

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