Leveraging Phenazine‐Based Ligands for Optimized Perovskite Optoelectronic Performance Through Chelation and Redox Engineering DOI

Pooja Aggarwal,

Ayushi Chaudhary, Siddharth Singh

и другие.

Advanced Optical Materials, Год журнала: 2024, Номер unknown

Опубликована: Окт. 29, 2024

Abstract Perovskite nanocrystals (PNCs) hold immense potential for optoelectronic and photovoltaic applications. However, their performance is hindered by surface defects that promote non‐radiative recombination reduce stability. Surface engineering, particularly through defect passivation, crucial achieving high‐performing perovskite solar cells. Chelation has been shown to significantly improve the efficiency stability of In this study, a novel chelation strategy using 1,10‐Phenanthroline (Phen) presented as bidentate chelating ligand effectively target passivate these detrimental defects. By strategically designing Phenanthroline derivative, dipyrido[3,2‐a:2′,3′‐c]phenazin‐11‐amine (Phen‐derivative) with optimized redox potentials, dual functionality: efficient passivation hole transport achieved. X‐ray photoelectron spectroscopy (XPS) confirms superior binding capability Phen‐derivative due chelation. This strong interaction facilitates ultrafast charge transfer from PNCs formation long‐lived charge‐separated state, evidenced sustained bleaching in transient absorption spectra. A metal‐dipyrido[3,2‐a:2′,3′‐c]phenazin‐11‐amine complex (Ir‐complex) derived dipyrido[3,2‐a:2′,3′‐c]phenazin‐11‐amine, but lacking site, hinders desired despite similar energetics. work emphasizes critical role chelation‐mediated interfacial interactions energy alignment effective shuttle molecules unlocking lead‐chelating transporters next‐generation light‐harvesting technologies.

Язык: Английский

Harnessing Pb–S Interactions for Long‐Term Water Stability in Cesium Lead Halide Perovskite Nanocrystals DOI
Monika Ahlawat, Ankita Sahu, Vishal Govind Rao

и другие.

Small, Год журнала: 2024, Номер 20(35)

Опубликована: Апрель 16, 2024

Lead halide perovskite nanocrystals (LHP NCs) have garnered attention as promising light-harvesting materials for optoelectronics and photovoltaic devices, attributed to their impressive optoelectronic properties. However, susceptibility moisture-induced degradation has hindered practical applications. Despite various encapsulation strategies, challenges persist in maintaining stability performance simultaneously. Here, a ligand exchange approach is proposed using (11-mercaptoundecyl)-N,N,N-trimethylammonium bromide (MUTAB) enhance the dispersibility of CsPbBr

Язык: Английский

Процитировано

9
Perovskite–Molecular Photocatalyst Synergy and Surface Engineering for Superior Photocatalytic Performance DOI
Shivani Gupta, Siddharth Singh,

Soumyadeep De

и другие.

ACS Applied Materials & Interfaces, Год журнала: 2025, Номер unknown

Опубликована: Фев. 15, 2025

Metal halide perovskite nanocrystals (NCs), known for their strong visible-light absorption and tunable optoelectronic properties, show significant promise photocatalytic applications. However, efficiency is often hindered by rapid charge recombination insufficient exciton dissociation, limiting effective catalysis. Excited-state interactions at the NC interface are critical in determining performance, underscoring need strategies that enhance separation minimize recombination. To address these challenges, we developed a composite material combining cesium lead bromide (CsPbBr3) with ferrocene carboxylic acid (FcA), hole-extracting moiety. This integration enhances dissociation through energy level alignment suppression, resulting 3-fold increase oxidation yield of benzylamine to N-benzylidenebenzylamine (35 ± 5% versus 12 2% pristine CsPbBr3). Additionally, thionyl (SOBr2) surface modification strips off ligands introduces ions onto CsPbBr3 NCs, further improving transfer substrate accessibility, 27 within 3 h. While SOBr2 treatment initial catalytic its acidic nature may reversible reactions side products over extended reaction times. study highlights impact molecular engineering on optimizing interfacial dynamics, providing pathway toward robust, high-efficiency photocatalysts sustainable chemical transformations.

Язык: Английский

Процитировано

1
Metal Halide Perovskite Nanocrystals for C–X Activation: Role of Halide Vacancies DOI

Siddharth Singh,

Sumit Sahu,

Diksha Mittal

и другие.

ACS Applied Nano Materials, Год журнала: 2024, Номер 7(14), С. 16913 - 16921

Опубликована: Июль 16, 2024

Metal halide perovskite nanocrystals (NCs) possess immense potential in photocatalysis. However, deciphering the intricate surface chemistry that governs these catalytic processes remains a challenge. This study investigates C–X bond activation with CsPbBr3 NCs, focusing on elucidating role of dynamic molecular domains dictating activity. By manipulating interactions through ligand dynamics, we identify vacancies as critical sites for activation. A systematic exploration different types reveals varying kinetics exchange, oleyl amine-capped NCs demonstrating highest reactivity. Temperature-dependent photoluminescence measurements corroborate findings, highlighting influence dynamics interactions. Additionally, postsynthetic treatments, such lead oleate modification, which leads to an increase density active (halide vacancies), significantly enhance performance. Conversely, SOBr2 treatment, repairs bromide vacancies, results almost completely suppressed So, by engineering environments, demonstrate significant improvement performance metal offering valuable insights future development.

Язык: Английский

Процитировано

6
Ligand modulation of active center to promote lead-free Cs2AgInCl6 photocatalytic CO2 reduction DOI

Baofei Sun,

Wei Chen, Yanyi Huang

и другие.

Journal of Energy Chemistry, Год журнала: 2024, Номер 95, С. 660 - 669

Опубликована: Апрель 24, 2024

Язык: Английский

Процитировано

5
Insights into interfacial mechanisms: CsPbBr3 nanocrystals as sustainable photocatalysts for primary amine oxidation DOI
Monika Ahlawat, Vishal Govind Rao

Chemical Communications, Год журнала: 2024, Номер 60(17), С. 2365 - 2368

Опубликована: Янв. 1, 2024

This study highlights CsPbBr 3 nanocrystals as a potent photocatalyst for oxidative coupling of primary amines to imines, where interfacial interactions markedly impact the reaction yield.

Язык: Английский

Процитировано

4
Long‐Lived Charge Separation Enabled by Molecular Engineering of Phenazine‐Based Hole Transport Materials DOI

Pooja Aggarwal,

Ayushi Chaudhary,

Soumyadeep De

и другие.

Small, Год журнала: 2025, Номер unknown

Опубликована: Апрель 18, 2025

Abstract Achieving long‐lived charge‐separated states is paramount for advancing perovskite solar cells technology, enhancing efficiency, and enabling kinetically slow processes like photocatalysis. While hole transport materials (HTMs) are essential efficient charge extraction, conventional suffer from high defect densities at the perovskite/HTM interface, leading to severe nonradiative recombination losses. Previous strategies surface passivation often rely on external treatments, which pose scalability challenges. This work overcomes these limitations by integrating functionality directly into HTMs through targeted molecular engineering of phenazine derivatives. By leveraging anchoring capability 1,10‐phenanthroline (Phen) skeleton strategically incorporating electron‐donating (─NH 2 , ─OCH 3 ) electron‐withdrawing (─NO ─Br) groups, electron density systematically modulated control transfer dynamics. Electron‐donating groups (EDGs) increase core, suppressing trap‐assisted stabilizing states. In contrast, (EWGs) promote dipole formation sites, prolonged separation, as confirmed observed sustained bleaching in transient absorption spectroscopy. study reveals profound impact substituent electronic effects interfacial interactions, offering a design strategy optimizing mitigation optoelectronics. These findings provide scalable approach perovskite‐based photovoltaics photocatalytic applications.

Язык: Английский

Процитировано

0
Semiconductor Photocatalysts in Photopolymerization Processes: Mechanistic Insights, Recent Advances, and Future Prospects DOI Creative Commons
Kasidid Yaemsunthorn, Wojciech Macyk, Joanna Ortyl

и другие.

Progress in Polymer Science, Год журнала: 2024, Номер unknown, С. 101891 - 101891

Опубликована: Сен. 1, 2024

Язык: Английский

Процитировано

2
Leveraging Phenazine‐Based Ligands for Optimized Perovskite Optoelectronic Performance Through Chelation and Redox Engineering DOI

Pooja Aggarwal,

Ayushi Chaudhary, Siddharth Singh

и другие.

Advanced Optical Materials, Год журнала: 2024, Номер unknown

Опубликована: Окт. 29, 2024

Abstract Perovskite nanocrystals (PNCs) hold immense potential for optoelectronic and photovoltaic applications. However, their performance is hindered by surface defects that promote non‐radiative recombination reduce stability. Surface engineering, particularly through defect passivation, crucial achieving high‐performing perovskite solar cells. Chelation has been shown to significantly improve the efficiency stability of In this study, a novel chelation strategy using 1,10‐Phenanthroline (Phen) presented as bidentate chelating ligand effectively target passivate these detrimental defects. By strategically designing Phenanthroline derivative, dipyrido[3,2‐a:2′,3′‐c]phenazin‐11‐amine (Phen‐derivative) with optimized redox potentials, dual functionality: efficient passivation hole transport achieved. X‐ray photoelectron spectroscopy (XPS) confirms superior binding capability Phen‐derivative due chelation. This strong interaction facilitates ultrafast charge transfer from PNCs formation long‐lived charge‐separated state, evidenced sustained bleaching in transient absorption spectra. A metal‐dipyrido[3,2‐a:2′,3′‐c]phenazin‐11‐amine complex (Ir‐complex) derived dipyrido[3,2‐a:2′,3′‐c]phenazin‐11‐amine, but lacking site, hinders desired despite similar energetics. work emphasizes critical role chelation‐mediated interfacial interactions energy alignment effective shuttle molecules unlocking lead‐chelating transporters next‐generation light‐harvesting technologies.

Язык: Английский

Процитировано

2