Influence of Phase Segregation on the Hysteresis of Perovskite Solar Cells

TL;DR

This paper investigates how phase segregation and spatial heterogeneity in perovskite layers influence the hysteresis behavior and stability of perovskite solar cells through numerical simulations.

Contribution

It introduces a detailed numerical analysis linking phase segregation, spatial non-uniformity, and hysteresis in perovskite solar cells, highlighting their impact on device stability.

Findings

Spatial heterogeneity affects hysteresis magnitude.

Phase segregation correlates with device degradation.

Ion density influences hysteresis trends.

Abstract

Organic-inorganic hybrid perovskite solar cells (PSC) have demonstrated impressive performance improvement. Among the various characteristics, the time-dependent current-voltage (J-V) hysteresis allows a direct exploration of various critical phenomena that affect the stability of PSCs. The hysteresis is associated with various spatial heterogeneity-related phenomena, including lifetime, bandgap, and phase segregation. We investigate these phenomena through numerical simulations and quantify how the spatial non-uniformity in the perovskite active layer impacts the hysteresis. Further, we correlate the time dependent device degradation with the hysteresis trends in terms of ion density and effective carrier lifetime.