A5086456552- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Perovskite Materials and Applications
- Solid-state spectroscopy and crystallography
- 2D Materials and Applications
- Advanced Fiber Laser Technologies
- Crystal Structures and Properties
- Solid State Laser Technologies
- Photorefractive and Nonlinear Optics
- Semiconductor Quantum Structures and Devices
- Nonlinear Optical Materials Research
- Organic Light-Emitting Diodes Research
- Conducting polymers and applications
Indian Institute of Science Education and Research Pune
2021-2025
University of Cambridge
2024
Structural non-centrosymmetry in semiconducting organic-inorganic hybrid halide perovskites can introduce functionalities like anomalous photovoltaics and nonlinear optical properties. Here we a design principle to prepare Pb- Bi-based two- one-dimensional with polar non-centrosymmetric space groups. The relies on creating dissimilar hydrogen halogen bonding non-covalent interactions at the interface. For example, organic cations I-(CH2)3-NH2(CH3)+ (MIPA), -CH3 is substituted by -CH2I one...
Abstract Optoelectronically active hybrid lead halide perovskites dissociate in water. To prevent this dissociation, here, we introduce long‐range intermolecular cation‐π interactions between A‐site cations of perovskites. An aromatic diamine like 4,4′‐trimethylenedipyridine, if protonated, can show a stacking, and therefore, serves as our cation. Consequently, 4,4′‐trimethylenedipyridinium bromide [(4,4′‐TMDP)Pb 2 Br 6 ], one‐dimensional perovskite, remains completely stable after...
Chiral hybrid metal halides show great promise for nonlinear optical (NLO) applications like circularly polarized second harmonic generation (SHG). The inherent toxicity of lead is a concern the widespread adoption frequently explored lead-based chiral halides. Here, we report and third-order NLO properties lead-free 0D compounds, (R-/S-MBA)4Bi2I10, their achiral counterpart, (Rac-MBA)4Bi2I10 (MBA: methylbenzylammonium) under excitation wavelength ranging 1360-1590 nm. (R-/S-MBA)4Bi2I10...
The introduction of chirality in layered hybrid perovskites breaks the symmetry their inorganic sub-lattices. Consequently, they show intriguing linear and non-linear optical properties. Here we explore effect on excitonic photoluminescence chiral (R- S-α-MBA)2PbI4 (MBA: methylbenzylammonium) at cryogenic temperatures. induced splits emissions below 150 K. Additionally, wavelength-tunable second harmonic generation (SHG) that depends strongly polarization angle incident light.
Abstract Low‐dimensional lead‐halide perovskites show wide structural and compositional diversity. Multiple functionalities can be introduced in these materials for diverse linear nonlinear optical applications. Nonlinear (NLO) processes depend on material polarizability, crystal symmetry, processibility. The flexibility of choosing organic cations provides an opportunity enhanced NLO responses by enhancing the overall system polarizability. A highly polarizable diisopropylammonium [Dipa;...
Hybrid lead halide perovskites have emerged as an important class of optoelectronic materials. A creative choice "A"-site organic cations produces hybrid with reduced dimensionality and intriguing light–matter interactions. Nonlinear optical effects are expected to be stronger in one-dimensional (1D) halides compared those their 2D or 3D analogues due greater quantum dielectric confinements. We performed extensive probe the third harmonic generation (THG) properties 1D pyridinium iodide...
Abstract Optoelectronically active hybrid lead halide perovskites dissociate in water. To prevent this dissociation, here, we introduce long‐range intermolecular cation‐π interactions between A‐site cations of perovskites. An aromatic diamine like 4,4′‐trimethylenedipyridine, if protonated, can show a stacking, and therefore, serves as our cation. Consequently, 4,4′‐trimethylenedipyridinium bromide [(4,4′‐TMDP)Pb 2 Br 6 ], one‐dimensional perovskite, remains completely stable after...
Lower dimensional lead halide perovskites have demonstrated highly enhanced nonlinear optical properties due to strong quantum and dielectric confinement. Broadband wavelength tunability of efficient performance is a critical challenge in futuristic applications. The structural versatility the provides number parameters for achieving this functionality. Varying composition can tune bandgap perovskites, which be employed achieve response. We varied 1D pyridinium system realize broadband third...