Deciphering Multiscale Heterogeneities in Perovskites for the Design of Durable and High-Performance Optoelectronics (HOPE)

• Applicant: Dr. Esma Ugur
• Subject Area: Synthesis and Properties of Functional Materials ; Physical Chemistry of Solids and Surfaces, Material Characterisation
• Term: since 2025
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 563861435

The success of emerging semiconductors in achieving widespread adoption relies on their ability to combine high-quality optoelectronic properties with fabrication simplicity, versatility, application-specific performance, and operational stability. In this context, metal halide perovskites have shown outstanding performance in various optoelectronic devices, particularly photovoltaics, contributing to the green energy transition. However, their stability, strongly linked to material heterogeneities, remains an unresolved challenge. Unlike mainstream silicon technologies, perovskites face multiple simultaneous degradation processes, complicating the identification of specific mechanisms. This project takes a broader scientific approach to understanding the role of multiscale heterogeneities in perovskite stability at both material and device levels. The research will provide critical insights into the roots of initial compositional heterogeneity and its impact on material structure and photophysical properties, particularly under external stressors such as thermal, photo, and photothermal effects. By investigating perovskites with different bandgaps, the project will enhance understanding of irreversible degradation mechanisms across various compositions. Through an integrated approach combining optoelectronic, electrical, and structural characterization with stability enhancement strategies, this projetc will address fundamental challenges that hinder commercialization and long-term deployment of perovskites. I bring proven expertise in tackling stability challenges using advanced optical characterization techniques and experience with perovskite-based tandem solar cells to uncover new strategies for improving performance.

• DFG Programme: Emmy Noether Independent Junior Research Groups
• Major Instrumentation: Hyperspectral Imaging System
• Instrumentation Group: 5450 Photographische Spezialkameras (Luftbild-, Registrier-, Stereo-, außer