Publication date: 17th February 2025
Metal halide perovskites have emerged as a class of semiconductors that challenges the dominance of conventional materials in applications such as solar cells. However, some of their distinctive characteristics, including ionic behavior, a soft lattice, and low formation energy, present additional challenges for stability and performance.
In this work, we explore postsynthetic strategies to harness such dynamic chemical nature of these materials.
We describe the mechanism that enables the fabrication of highly luminescent 3D lead-based perovskite nanoparticles [1] from non-emissive 0D material composite films. In this process, hydroxide ions play a pivotal role, reversibly binding to the perovskite particles, passivating traps, and enhancing both stability and optical properties. The matrix’s basicity is critical in generating OH⁻ ions, which facilitate surface passivation and improve the overall performance of the perovskite nanocomposites. [2]
Additionally, we highlight advancements in Sn-based perovskites, where additives induce superior crystallization, resulting in lead-free films with enhanced stability. These improvements translate into photovoltaic devices that maintain performance for over 2000 hours of continuous operation in an inert atmosphere, [3] and more importantly, they exhibit unconventional reactions to humidity exposure.
These approaches underscore the transformative potential of postsynthetic modifications in overcoming the inherent limitations of perovskites, paving the way for stable, high-performance optoelectronic devices.
The work was partially funded by MCIN/ AEI through project TED2021-131600B-C32 and by Generalitat Valenciana via Pla Gent-T (grant CIDEXG/2022/34). The results are part of the grant CNS2023-144270 funded by MICIU/AEI/10.13039/501100011033 and by European Union NextGenerationEU/PRTR
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