Antimony doped Tin Oxide/Polyethylenimine Electron Selective Contact for reliable and light soaking-free high Performance Inverted Organic Solar Cells

TL;DR

This paper presents a novel low-temperature solution-processed electron selective contact using antimony doped tin oxide and polyethylenimine, enabling high-efficiency, light soaking-free inverted organic solar cells with stable performance.

Contribution

It introduces a new ATO/PEI contact that achieves high efficiency and reliability in inverted OPVs without light soaking, suitable for roll-to-roll manufacturing.

Findings

High power conversion efficiencies achieved with ATO/PEI contact.

Light soaking-free operation demonstrated in inverted OPVs.

Efficiency remains stable with increased ATO layer thickness.

Abstract

We have demonstrated a high-performance low temperature solution processed electron selective contact consisting of 10 at% antimony doped tin oxide (ATO) and the neutral polymer polyethylenimine (PEI). Inverted organic photovoltaics (OPVs) utilizing ATO/PEI as electron selective contact exhibited high power conversion efficiencies for both the reference P3HT: PCBM and the non-fullerene based P3HT- IDTBR active layer OPV material systems. Importantly it is shown that the proposed ATO/PEI carrier selective contact provides light soaking-free inverted OPVs. Furthermore, by increasing the thickness of ATO layer from 40 to 120 nm the power conversion efficiency of the corresponding inverted OPVs remain unaffected a parameter which indicates the potential of the proposed ATO/PEI carrier selective contact for high performance light-soaking-free and reliable roll-to-roll printing solutions processed inverted OPVs.