Tõnu Pullerits
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View article: Dual conformational emission and vibrational coherence in a sulfone-embedded narrowband emitter
Dual conformational emission and vibrational coherence in a sulfone-embedded narrowband emitter Open
We revealed the intrinsic excited state structural and vibrational dynamics in the sulfone-embedded narrowband emitter 2tCPD.
View article: Sparse optimization of two-dimensional terahertz spectroscopy
Sparse optimization of two-dimensional terahertz spectroscopy Open
Two-dimensional terahertz spectroscopy (2DTS) is a low-frequency analog of two-dimensional optical spectroscopy that is rapidly maturing as a probe of a wide variety of condensed matter systems. However, a persistent problem with 2DTS is t…
View article: About carrier's self-trapping and dynamical Rashba splitting in the two-dimensional hybrid perovskite (BA)$_2$(MA)$_2$Pb$_3$I$_{10}$
About carrier's self-trapping and dynamical Rashba splitting in the two-dimensional hybrid perovskite (BA)$_2$(MA)$_2$Pb$_3$I$_{10}$ Open
Time- and Angle-Resolved Photoelectron Spectroscopy (tr-ARPES) is employed to monitor photoexcited electrons in the two-dimensional hybrid perovskite (BA)$_2$(MA)$_2$Pb$_3$I$_{10}$. Photoelectron intensity maps are in good agreement with a…
View article: Microcavity-enhanced exciton dynamics in light-harvesting complexes: Insights from Redfield theory
Microcavity-enhanced exciton dynamics in light-harvesting complexes: Insights from Redfield theory Open
We investigated the exciton transfer dynamics in photosynthetic light-harvesting complex 2 (LH2) coupled to an optical microcavity. Using computational simulations based on Redfield theory, we analyzed how microcavity coupling influences e…
View article: Phonon-Mediated Chirality Transfer from Organic Cation to Inorganic lattice in Hybrid Perovskites
Phonon-Mediated Chirality Transfer from Organic Cation to Inorganic lattice in Hybrid Perovskites Open
Two-dimensional hybrid metal halide perovskites combine strong spin-orbit coupling, soft lattice dynamics and molecular tunability, making them promising platforms for chiral optoelectronics and spin dependent phenomena. While chiral organ…
View article: M(III) Site‐Driven Structural Engineering on Lead‐Free Layered Double Perovskite Nanocrystals with Enhanced Photoelectrochemical Activity
M(III) Site‐Driven Structural Engineering on Lead‐Free Layered Double Perovskite Nanocrystals with Enhanced Photoelectrochemical Activity Open
Over the past decade, organic–inorganic hybrid perovskites have revolutionized next‐generation semiconductors, driving unprecedented advancements in cost‐effective optoelectronics. While lead‐based perovskite semiconductors exhibit excepti…
View article: <scp>AI</scp>‐Enhanced High‐Resolution Functional Imaging Reveals Trap States and Charge Carrier Recombination Pathways in Perovskite
<span>AI</span>‐Enhanced High‐Resolution Functional Imaging Reveals Trap States and Charge Carrier Recombination Pathways in Perovskite Open
Understanding and managing charge carrier recombination dynamics is crucial for optimizing the performance of metal halide perovskite optoelectronic devices. In this work, we introduce a machine learning‐assisted intensity‐modulated two‐ph…
View article: Photocurrent detected 2D spectroscopy via pulse shaper: insights and strategies for optimally untangling the nonlinear response
Photocurrent detected 2D spectroscopy via pulse shaper: insights and strategies for optimally untangling the nonlinear response Open
Action-detected two-dimensional electronic spectroscopy (A-2DES) provides valuable insights into ultrafast dynamics within functional materials and devices by measuring incoherent signals like photocurrent. This work details the implementa…
View article: Dimensionality-dependent electronic and vibrational dynamics in low-dimensional organic-inorganic tin halides
Dimensionality-dependent electronic and vibrational dynamics in low-dimensional organic-inorganic tin halides Open
Photo-induced dynamics of electronic processes in materials are driven by the coupling between electronic and nuclear degrees of freedom. Here we construct 1D and 2D organic-inorganic tin halides to investigate the functional role of dimen…
View article: Microcavity-Enhanced Exciton Dynamics in Light-Harvesting Complexes: Insights from Redfield Theory
Microcavity-Enhanced Exciton Dynamics in Light-Harvesting Complexes: Insights from Redfield Theory Open
We investigated the exciton transfer dynamics in photosynthetic light-harvesting complex 2 (LH2) coupled to an optical microcavity. Using computational simulations based on Redfield theory, we analyzed how microcavity coupling influences e…
View article: Revealing the 1,4-diethynylbenzene SERS activity and docking studies by DFT
Revealing the 1,4-diethynylbenzene SERS activity and docking studies by DFT Open
Surface-enhanced Raman scattering (SERS) technology can detect molecular information; Because of its high sensitivity, it is widely used in chemical analysis. In this study discussed the experimental detection of 1,4-diethynylbenzene molec…
View article: Coherent Phonons, Localization, and Slow Polaron Formation in Lead‐Free Gold Perovskite
Coherent Phonons, Localization, and Slow Polaron Formation in Lead‐Free Gold Perovskite Open
Lead‐free metal halide perovskites are emerging as less‐toxic alternatives to their lead‐based counterparts. However, their applicability in optoelectronic devices is limited, and the charge transport dynamics remain poorly understood. Und…
View article: Efficient cavity-mediated energy transfer between photosynthetic light harvesting complexes from strong to weak coupling regime
Efficient cavity-mediated energy transfer between photosynthetic light harvesting complexes from strong to weak coupling regime Open
Excitation energy transfer between photosynthetic light-harvesting complexes is vital for highly efficient primary photosynthesis. Controlling this process is the key for advancing the emerging artificial photosynthetic systems. Here, we e…
View article: Balancing the Charge Separation and Surface Reaction Dynamics in Twin‐Interface Photocatalysts for Solar‐to‐Hydrogen Production
Balancing the Charge Separation and Surface Reaction Dynamics in Twin‐Interface Photocatalysts for Solar‐to‐Hydrogen Production Open
Solar‐driven photocatalytic green hydrogen (H 2 ) evolution reaction presents a promising route toward solar‐to‐chemical fuel conversion. However, its efficiency has been hindered by the desynchronization of fast photogenerated charge carr…
View article: Unveiling Mechanism of Temperature‐Dependent Self‐Trapped Exciton Emission in 1D Hybrid Organic–Inorganic Tin Halide for Advanced Thermography
Unveiling Mechanism of Temperature‐Dependent Self‐Trapped Exciton Emission in 1D Hybrid Organic–Inorganic Tin Halide for Advanced Thermography Open
Lead‐free hybrid metal halide phosphors/crystals showing self‐trapped exciton (STE) emission have been recently explored for thermography due to the strong temperature dependence of their photoluminescence (PL) lifetime ( τ ). However, rea…
View article: Coherent Phonons, Localization and Slow Polaron Formation in Lead-free Gold Perovskite
Coherent Phonons, Localization and Slow Polaron Formation in Lead-free Gold Perovskite Open
Lead-free metal halide perovskites are emerging as less-toxic alternatives to their lead-based counterparts. However, their applicability in optoelectronic devices is limited, and the charge transport dynamics remain poorly understood. Und…
View article: Sparse Optimization of Two-Dimensional Terahertz Spectroscopy
Sparse Optimization of Two-Dimensional Terahertz Spectroscopy Open
Two-dimensional terahertz spectroscopy (2DTS) is a low-frequency analogue of two-dimensional optical spectroscopy that is rapidly maturing as a probe of a wide variety of condensed matter systems. However, a persistent problem of 2DTS is t…
View article: Synthesis of Well-Ordered Functionalized Silicon Microwires Using Displacement Talbot Lithography for Photocatalysis
Synthesis of Well-Ordered Functionalized Silicon Microwires Using Displacement Talbot Lithography for Photocatalysis Open
Metal-assisted chemical etching (MACE) is a cheap and scalable method that is commonly used to obtain silicon nano- or microwires but lacks spatial control. Herein, we present a synthesis method for producing vertical and highly periodic s…
View article: Size‐Dependent Multi‐Electron Donation in Metal‐Complex Quantum Dots Hybrid Catalyst for Photocatalytic Carbon Dioxide Reduction
Size‐Dependent Multi‐Electron Donation in Metal‐Complex Quantum Dots Hybrid Catalyst for Photocatalytic Carbon Dioxide Reduction Open
The effective conversion of carbon dioxide (CO 2 ) into valuable chemical fuels relies significantly on the donation of multiple electrons. Its efficiency is closely linked to both the density and lifetime of excited charge carriers. In th…
View article: Machine Learning Regression Analyses of Intensity Modulation Two-Photon Microscopy (ml-IM2PM) in Perovskite Microcrystals
Machine Learning Regression Analyses of Intensity Modulation Two-Photon Microscopy (ml-IM2PM) in Perovskite Microcrystals Open
Perovskite thin films hold great promise for optoelectronic applications, such as solar cells and light-emitting diodes. One challenge is the inevitable formation of defects in the material. A thorough understanding of the defect formation…
View article: Direct Visualization of Confinement and Many‐Body Correlation Effects in 2D Spectroscopy of Quantum Dots
Direct Visualization of Confinement and Many‐Body Correlation Effects in 2D Spectroscopy of Quantum Dots Open
The size tunable color of colloidal semiconductor quantum dots (QDs) is probably the most elegant illustration of the quantum confinement effect. As explained by the simple “particle‐in‐a‐box” model, the transition energies between the lev…
View article: Carrier Cooling in Lead Halide Perovskites: A Perspective on Hot Carrier Solar Cells
Carrier Cooling in Lead Halide Perovskites: A Perspective on Hot Carrier Solar Cells Open
The concept of hot carrier solar cells (HCSCs) has been proposed as a promising yet elusive path toward high-performance photovoltaics (PV), capable of surpassing the Shockley-Queisser limit by recycling energy that would otherwise be lost…
View article: Machine learning regression analyses of intensity modulation two-photon spectroscopy (Mlim) in perovskite microcrystals
Machine learning regression analyses of intensity modulation two-photon spectroscopy (Mlim) in perovskite microcrystals Open
Perovskite thin films hold great promise for optoelectronic applications, such as solar cells and light emitting diodes. A challenge is that defects are unavoidably formed in the material. Thorough understanding of the defect formation and…
View article: Effect of Submonolayer ZnS Shell on Biexciton Dynamics of Indium Phosphide Quantum Dots
Effect of Submonolayer ZnS Shell on Biexciton Dynamics of Indium Phosphide Quantum Dots Open
Understanding high‐order biexciton dynamics is important for the use of semiconductor quantum dots (QDs) in optoelectronic devices. The core–shell structure can be used to modulate biexciton dynamics by varying the shell thickness and core…
View article: Nature of Self-Trapped Exciton Emission in Zero-Dimensional Cs<sub>2</sub>ZrCl<sub>6</sub> Perovskite Nanocrystals
Nature of Self-Trapped Exciton Emission in Zero-Dimensional Cs<sub>2</sub>ZrCl<sub>6</sub> Perovskite Nanocrystals Open
Low dimensional perovskite-inspired materials with self-tapped exciton (STE) emission have stimulated a surge of cutting-edge research in optoelectronics. Despite numerous efforts on developing versatile low-dimensional perovskite-inspired…
View article: Temperature-Dependent Intensity Modulated Two-Photon Excited Fluorescence Microscopy for High Resolution Mapping of Charge Carrier Dynamics
Temperature-Dependent Intensity Modulated Two-Photon Excited Fluorescence Microscopy for High Resolution Mapping of Charge Carrier Dynamics Open
We present a temperature-dependent intensity modulated two-photon excited fluorescence microscopy technique that enables high-resolution quantitative mapping of charge carrier dynamics in perovskite microcrystal film. By disentangling the …