Nanoparticulate Metal Oxide Top Electrode Interface Modification Improves the Thermal Stability of Inverted Perovskite Photovoltaics

TL;DR

This study introduces a solution-processed b3-Fe2O3 nanoparticle interface modification for inverted perovskite solar cells, enhancing their thermal stability without sacrificing efficiency.

Contribution

It demonstrates that b3-Fe2O3 nanoparticles can serve as an effective top electrode interface modifier, improving thermal stability in inverted perovskite photovoltaics.

Findings

Comparable power conversion efficiencies achieved

Enhanced thermal stability under heat stress

Reduced charge trap density at interfaces

Abstract

Solution processed {\gamma}-Fe2O3 nanoparticles via the solvothermal colloidal synthesis in conjunction with ligand-exchange method are used for interface modification of the top electrode in inverted perovskite solar cells. In comparison to more conventional top electrodes such as PC(70)BM/Al and PC(70)BM/AZO/Al, we show that incorporation of a {\gamma}-Fe2O3 provides an alternative solution processed top electrode (PC(70)BM/{\gamma}-Fe2O3/Al) that not only results in comparable power conversion efficiencies but also improved thermal stability of inverted perovskite photovoltaics. The origin of improved stability of inverted perovskite solar cells incorporating PC(70)BM/ {\gamma}-Fe2O3/Al under accelerated heat lifetime conditions is attributed to the acidic surface nature of {\gamma}-Fe2O3 and reduced charge trapped density within PC(70)BM/ {\gamma}-Fe2O3/Al top electrode interfaces.