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Point defects at grain boundaries can create structural instabilities and persistent deep traps in metal halide perovskites.
Nanoscale
January 2025
Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA.
Article Synopsis
- Metal halide perovskites (MHPs) are popular for their low cost and performance, aided by their unique defect dynamics.
- Research focused on how defects like grain boundaries and lead interstitials create new chemical species that destabilize material properties, preventing recovery to their original structure.
- Long-lasting defects at grain boundaries negatively affect charge mobility and lifetime, emphasizing the need for effective strategies to manage these defects for improved performance.
Oleylammonium fluoride passivated blue-emitting 2D CsPbBr nanoplates with near-unity photoluminescence quantum yield: safeguarding against threats from external perturbations.
Chem Sci
January 2025
Department of Chemistry, Indian Institute of Technology Kanpur Kanpur - 208 016 UP India +91 512 259 6806 +91 512 259 6312.
Quantum-confined, two-dimensional (2D) CsPbBr (CPB) nanoplates (NPLs) have emerged as exceptional candidates for next-generation blue LEDs and display technology applications. However, their large surface-to-volume ratio and detrimental bromide vacancies adversely affect their photoluminescence quantum yield (PLQY). Additionally, external perturbations such as heat, light exposure, moisture, oxygen, and solvent polarity accelerate their transformation into three-dimensional (3D), green-emitting CPB nanocrystals (NCs), thereby resulting in the loss of their quantum confinement.
View Article and Find Full Text PDFTailoring Multifunctional Amine Salts Based on Anisole Liquid Soaking for Fabricating Efficient and Stable Perovskite Solar Cells.
ACS Appl Mater Interfaces
December 2024
Guangxi Key Laboratory of Optical and Electronic Material and Devices, School of Materials Science and Engineering, Guilin University of Technology, 12 Jiangan Road, Guilin, Guangxi 541004, China.
The post-treatment based on spin-coating (SC) organic amine salts is commonly used for surface modification of perovskite films to eliminate defects. However, there is still a lack of systematic study and a unified understanding of the functions and mechanisms of different organic amine salts. The SC method is also not conducive to the industrialization of solar cells.
View Article and Find Full Text PDFReinforcing Photogenerated Carrier Extraction of Environment-Friendly InP/ZnSeS Quantum Dots for High-Performing Photoelectrochemical Photodetection and Solar Energy Conversion.
Small
January 2025
Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 610054, P. R. China.
Colloidal InP/ZnSeS-based quantum dots (QDs) are considered promising building blocks for light-emitting devices due to their environmental friendliness, high quantum yield (QY), and narrow emission. However, the intrinsic type-I band structure severely hinders potential photoelectrochemical (PEC) applications requiring efficient photoexcited carrier separation and transfer. In this study, the optoelectronic properties of InP/ZnSeS QDs are tailored by introducing Al dopants in the ZnSeS layer, which concurrently passivate the surface defects and act as shallow donor states for suppressed non-radiative recombination and improved charge extraction efficiency.
View Article and Find Full Text PDFLong-term performance and mechanism of in-situ biogenetic sulfidated zero-valent iron for enhanced nitrate reduction.
Bioresour Technol
January 2025
Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA 01003, USA.
The biogenetic sulfidation of zero-valent iron (BS-ZVI) by sulfate-reducing bacteria (SRB) has been demonstrated to enhance the reactivity of ZVI. However, long-term performance of BS-ZVI and related mechanism were still unknown. Therefore, columns containing sponge iron and SRB are built to prepare BS-ZVI in-situ and study its long-term performance.
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