Debattam Sarkar

The so-called 329 perovskites, with their A3B2X9 stoichiometry, are attracting broad interest for their lead-free nature, environmental stability, and potential in optoelectronic devices such as solar cells and light emitters....our latest publication in @J_A_C_S: "Ultrafast Carrier Self-Trapping Driven by Strong Exciton–Phonon Coupling in 2D MA3Bi2I6Cl3 Perovskite." In this work, we explore lead-free 2D hybrid bismuth halide perovskites for optoelectronic applications. Using temperature-dependent photoluminescence and femtosecond transient absorption spectroscopy, we uncover strong exciton-phonon interactions, characterized by giant Huang-Rhys factors, coherent phonon oscillations, and ultrafast carrier self-trapping into small-polaron and self-trapped exciton (STE) states. Photoexcited carriers rapidly localize, with PL emission primarily from STEs, while free exciton emission is minimal and transient. Comparisons with 0D MA3Bi2I9 and 2D MA3Bi2Br9 highlight how halide composition and dimensionality modulate free excitons versus localization. Read more: pubs.acs.org/doi/abs/10.102… #Perovskites #LeadFreeMaterials #Optoelectronics #MaterialsScience #Nanotech

In JACS: Deterministic control of the long debated Sn3+ state in AgSnSe2, one of chemistry’s “impossible” oxidation states. Using XPS, Mössbauer, and XAS (backed by DFT), we directly confirm uniform Sn3+ in pristine AgSnSe2. Sb substitution provides a clean chemical knob that drives Sn from +3 to mixed +2/+4 (valence skipping), progressively suppressing superconductivity (Tc ~5 K) and inducing a metal-to-semiconductor transition. A rare system to interrogate how valence reshapes the electronic ground state. DOI: 10.1021/jacs.5c21696

@IyerAbishek Congratulations 🔥

First paper from our group! Special issue honoring my postdoc supervisor @MercouriK Discovery of Noncentrosymmetric Sr3As2S7 and Sr3As2Se2.5S4.5 Featuring As3+/As5+ Coordination and Their Strong Nonlinear Optical Response | Chemistry of Materials pubs.acs.org/doi/10.1021/ac…

Through Interdisciplinary Work at Northwestern, Advanced Imaging Reveals Hidden Thermoelectric Structure mccormick.northwestern.edu/news/articles/…

@beingkemist Congratulations debu da

🧪Happy to share our review “Electrochemical Carbon Dioxide Reduction to Methanol on Copper-Based Catalysts: Mechanistic Insights and Industrial Prospects” published in Advanced Materials. Thanks to all co-authors for their valuable support. 🍀⛽️🎉 doi.org/10.1002/adma.2…

Excited to share our 3 articles got accepted last month @J_A_C_S including my work from postdoc @NorthwesternU and PhD @jncasr research. Multislice electron ptychography, relaxor ferroelectricity & paramagnetic spin fluctuation were applied for the first time to thermoelectrics.

New @J_A_C_S : We reveal relaxor ferroelectricity as the origin of ultralow, glass-like thermal conductivity in crystalline AgPbSbSe₃ -linking polar nanodomain dynamics to phonon scattering @jncasr @ANRFIndia @IndiaDST pubs.acs.org/doi/10.1021/ja…

@PRASADDEBENDRA Congratulations bro

Glad to share our recent publication, where we have achieved indoor photovoltaic efficiency of 11.9% for DMSO-free tin perovskites with excellent long-term stability. Grateful to my mentor and collaborators for their support. pubs.acs.org/doi/10.1021/ac…

Mo 4d orbital induced rare conduction band convergence and misfit nanostructures boost thermoelectric zT to 1.8 in n-type PbSe. Successful collaboration between @jncasr @iiscbangalore @IITKanpur @IISERPune Just out in @angew_chem @ANRFIndia @IndiaDST onlinelibrary.wiley.com/doi/10.1002/an…

Glassy thermal transport and zT of 2.7 in doped GeTe results from the inhomogeneous ferroelectric instability developed due to local polar distortions near the dopant sites. Just out in Advanced Materials @DebattamS @subarnadas_ @jncasr advanced.onlinelibrary.wiley.com/doi/10.1002/ad…

Onsite 4s-3d coupling in Cu drives the local distortion in CuS4 tetrahedra in TlCuS, which resulted in significant anharmonicity and promising thermoelectric performance. Just out in @J_A_C_S @animesh_bhui @VenkataMatu @jncasr @IndiaDST pubs.acs.org/doi/10.1021/ja…

@MoinakDutta0 @RosseinskyGroup Congratulations Moinak da

My paper from Post-doc from the University of Liverpool (@RosseinskyGroup ) is out now. We have successfully demonstrated a computational screening workflow designed to accelerate the discovery of metal intercalated polycyclic aromatic hydrocarbon. pubs.rsc.org/en/content/art…

@PremakumarYanda @WileyGlobal @AdvPortfolio @mpi_CPfS @claudia_felser @cgsbond Congratulations bhaiya

In our recent article, we observed Giant Topological Hall Effect and Colossal Magnetoresistance in Heusler Ferromagnet near Room Temperature - Yanda - Advanced Materials - Wiley Online Library onlinelibrary.wiley.com/doi/full/10.10… @WileyGlobal @AdvPortfolio @mpi_CPfS @claudia_felser @cgsbond

Sub-valent (Bi2)4+ dimer acts as “twin rattler” in complex metal chalco-halide Bi13S18Br2 to tune its electronic and thermal transport properties, which makes it an excellent thermoelectric material. Just out in @J_A_C_S. @jncasr @IndiaDST pubs.acs.org/doi/full/10.10…

Local structural symmetry breaking upon heating, termed as emphanisis, evidenced in Ruddlesden–Popper mixed halide perovskite, Cs2PbI2Cl2. Just appeared in Advanced Materials @AdvSciNews @jncasr @IndiaDST @fermiion onlinelibrary.wiley.com/doi/10.1002/ad…

@narendramodi Congratulations #NeerajChopra 🥇- South Asian Games 🥇- Asian Championship 🥇- CWG 2018 🥇- Asian Games 🥇- Tokyo Olympics 🥇- Diamond League 🥈- World Championships 🥇- World Championships 🥈- Diamond League 🥇- Asian Games 🥈- Paris Olympics THE GOAT ATHELETE...!!! 🇮🇳🔥

@femto_apurba Congratulations Apurba Da🤗

Finally out! Happy to share our latest work in @J_A_C_S on unveiling the stimulated emission cross section in quantum confined perovskite NCs | @HebrewU @EtgarGroup @Sbhunia_chem 👉 pubs.acs.org/doi/10.1021/ja…