AI Article Synopsis
- Halide perovskites are promising materials for optoelectronic devices, particularly photovoltaics, but they face stability issues, specifically a tendency to change from their perovskite structure to a more stable nonperovskite form.
- The study focuses on the phase transition of CsPbI, identifying a significant decrease in the transition rate when the material is surface-treated with CsI and CdI compared to untreated films.
- Surface chemistry analysis via XPS reveals that surface iodide concentration influences this transition rate, suggesting that vacancies in surface iodide are crucial for the growth of the nonperovskite phase, highlighting that phase nucleation is a critical factor in the stability of CsPbI thin films.
Article Abstract
Halide perovskites are technologically interesting across a wide range of optoelectronic devices, especially photovoltaics, but material stability has proven to be challenging. One degradation mode of note is the meta stability of the perovskite phase of some material compositions. This was studied by tracking the change of CsPbI from its optoelectronically relevant perovskite phase to its thermodynamically stable nonperovskite phase, δ-CsPbI. We explore kinetics as a function of surface chemistry and observe a quantitatively similar, ∼5-fold, reduction in the phase transition rate between neat films and those treated with CsI and CdI. Using XPS to explore surface chemistry changes across samples, we link the reduction in the phase transition rate to the surface iodide concentration. When informed by previous theoretical studies, these experiments point to surface iodide vacancies as the nucleation sites for δ-CsPbI growth and show that phase nucleation is the rate limiting step in δ-CsPbI formation for CsPbI perovskite thin films.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11406572 | PMC |
| http://dx.doi.org/10.1021/acsenergylett.4c01465 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Non-monotonic Variation of Potential-dependent Surface Diffusion at Electrochemical Interfaces in the Presence of Coadsorbates.
Angew Chem Int Ed Engl
January 2025
University of Kiel, Physics, Olshausenstr. 40, 24098, Kiel, GERMANY.
The influence of coadsorbed ions on adsorbate diffusion, an inherent effect at solid-liquid interfaces, was studied for adsorbed sulfur on Ag(100) electrodes in the presence of bromide or iodide. Quantitative in situ high-speed scanning tunnelling microscopy (video-STM) measurements were performed both in the potential regime of the c(2×2) halide adlayer at its saturation coverage and in the regime of a disordered adlayer where the halide coverage increases with potential. These studies reveal a surprising non-monotonic potential dependence of Sad diffusion with an initial increase with halide coverage, followed by a decrease upon halide adlayer ordering into the c(2×2) structure.
View Article and Find Full Text PDFSolvent-Mediated Growth of a Hierarchical Zero-Dimensional Architecture for Efficient CsPbI Quantum Dot Solar Cells.
Small
January 2025
School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, 230009, China.
Perovskite quantum dots (QDs) are promising optoelectronic materials. The large surface area provides an opportunity for ligand engineering to protect the QDs, while also impeding the charge transport in the QD array. Here, the solvent-mediated growth of a hierarchical zero-dimensional (HZD) architecture between CsPbI QDs is reported.
View Article and Find Full Text PDFInterfacial Work Function Modulation of Wide Bandgap Perovskite Solar Cell for Efficient Perovskite/CIGS Tandem Solar Cell.
Small Methods
January 2025
Center for Photonics Information and Energy Materials, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, 518055, P. R. China.
Wide-bandgap perovskite solar cells (PVSCs), a promising top-cell candidate for high-performance tandem solar cells, often suffer from larger open-circuit voltage (V) deficits as the bandgap increases. Surface passivation is a common strategy to mitigate these V deficits. However, understanding the mechanisms underlying the differences in passivation effects among various types of molecules remains limited, which is crucial for developing universal interface passivation strategies and guiding the design of passivation molecules.
View Article and Find Full Text PDFSurface Template Realizing Oriented Perovskites for Highly Efficient Solar Cells.
Adv Mater
January 2025
Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory of Advanced Negative Carbon Technologies, Soochow University, Suzhou, 215123, China.
Formamidinium lead iodide (FAPbI) perovskite films, ensuring optically active phase purity with uniform crystal orientation, are ideal for photovoltaic applications. However, the optically active α-FAPbI phase is easy to degrade into δ-phase due to numerous defects within randomly oriented films. Here, a "quasi-2D" perovskite template is pre-deposited on the film surface within the crystallization process based on the two-step preparation technology, which directly induced pure and highly orientated crystallization of α-FAPbI across the downward growth process.
View Article and Find Full Text PDFIn vivo toxic and lethal cardiorespiratory effects of a synthetic quaternary ammonium salt derivative of haloperidol in mice.
Animal Model Exp Med
January 2025
Department of Pharmacology, Shantou University Medical College, Shantou, Guangdong, China.
Background: To investigate the toxicity of N-n-butyl haloperidol iodide (F2), a quaternary ammonium salt derivative of haloperidol, in mice for potential therapeutic purposes.
Methods: The acute median lethal dose (LD) of F2 was determined using the Bliss method following intravenous administration in mice. Routine surface electrocardiograms (ECGs) and arterial blood pressures (aBPs) were recorded under general anesthesia in untreated and pharmacologically vagotomized mice injected with F2.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!