Stabilizing Sputtered NiO<sub>x</sub> via In Situ Dissociative Adsorption Passivation for Efficient Perovskite Solar Cells.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 42132107.
- Also identified by DOI 10.1002/adma.73382.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
Sputtered nickel oxide (NiO<sub>x</sub>) is an industrially compatible hole transport layer for perovskite solar cells (PSCs), yet its practical deployment is limited by interfacial instability arising from disordered Ni<sup>3+</sup> species and unfavorable reactions with perovskite absorbers. Here, we introduce an in situ dissociative adsorption passivation (IDAP) strategy using bromoacetamide (BAA) to stabilize sputtered NiO<sub>x</sub>. In this approach, Br<sup>-</sup> ions act as site-blockers by coordinating with surface Ni, suppressing interfacial disorder and stabilizing Ni<sup>3+</sup> species, while the amide group provides dual anchoring: N-H···O hydrogen bonding strengthens attachment to NiO<sub>x</sub>, and the carbonyl group (C═O) passivates the uncoordinated Pb<sup>2+</sup> located at or near the interface between the NiO<sub>x</sub> and the perovskite films. These cooperative efforts reduce trap states, suppress interfacial redox reactions, and mitigate defect-driven degradation under thermal stress. PSCs incorporating BAA-NiO<sub>x</sub> achieve a champion power conversion efficiency (PCE) of 26.31% along with a certified PCE of 26.07%, while the larger-area PSCs (1 cm<sup>2</sup>) maintain 25.48% efficiency. This is one of the highest efficiencies reported for NiO<sub>x</sub>-based PSCs. In addition, the encapsulated cell retains 93% of its initial performance after 1500 h of continuous operation.