Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: Hybrid and Perovskite Photovoltaics I

CPP 8.1: Hauptvortrag

Montag, 17. März 2025, 15:00–15:30, H38

The Nanoscale Photovoltaics Laboratory on a Tip — •Stefan Weber — Institute for Photovoltaics, University of Stuttgart — Max Planck Institute for Polymer Research

Electrical scanning probe microscopy (SPM) modes are ideal for nanoscale photovoltaic measurements. I will discuss our recent work on developing specialized SPM techniques to study hybrid perovskite materials. Optimizing perovskite solar cells requires understanding energy losses, instability, and aging processes. These macroscale properties result from the interplay between nanoscale structure and function, including twin domains, grain boundaries, interfaces, and crystal grain orientations. Using static and time-resolved Kelvin probe force microscopy (KPFM), we can map the local surface potential, surface photovoltage (SPV), and cross-sectional potential distributions under operating conditions. With Nano-SPV spectroscopy, we achieve 10-20 nm lateral- and sub-millisecond temporal resolution. Our research aims to address key challenges in perovskite research, such as phase segregation, degradation, and interface heterogeneity, advancing understanding of loss mechanisms and instabilities in MHP solar cells.

Keywords: Atomic force microscopy; Kelvin Probe Force Microscopy; Surface Photovoltage