Halide perovskites and related materials: A new playground of discoveries by Prof. Dipankar Das Sarma

Location and Date: 
Mar 24th, 2025 (Monday), 4 PM, DESE seminar Room, 2nd Floor

 Abstract

 
The last fifteen years have seen the most spectacular rise of a class of materials initially known as the hybrid halide perovskites, with the field quickly evolving to encompass all-inorganic halide perovskites and double perovskites, low-dimensional hybrid halide materials, and quantum dots. With intense worldwide research activities over the last decade, photovoltaic, light-emissive, and detection properties of this class of materials have reached superlative performance levels within this exceptionally short period and have taken the world by surprise. I shall discuss some historical aspects of this field of study, followed by some of our recent results1-3 to exemplify the excitement in this field in terms of discovering new materials and material properties. If time permits, I shall touch upon another exciting field comprising chiral systems4-6 where some of the systems can even be made ferroelectrics.
References:
1.     Realizing the lowest bandgap and exciton binding energy in a two-dimensional lead halide system, D Pariari et al., J. Am. Chem. Soc. 145 (2023) 15896.
2.     Non-monotonic Thermal Conductivity of FAxMA1–xPbI3 Achieving Ultralow Values: The Role of Anharmonic Low Energy Rotation of Organic Moieties, Debasmita Pariari et al., ACS Energy Lett. 9 (2024) 2128.
3.     Evidence of Athermal Metastable Phase in a Halide Perovskite: Optically-Tracked Thermal-Breach-Memory, Kingshuk Mukhuti et al., Phys. Rev. Lett. 134 (2025) 076901.
4.     Unique Chiro-optical Properties of the Weakly-2D (R-/S-MBA)2CuBr4 Hybrid Material, R Das et al., ACS Materials Letters 5 (2023) 1556
5.     Family of Chiral Ferroelectric Compounds with Widely Tunable Band Gaps, R Das et al., Chem. Mater. 36 (2024) 1891
6.     Deriving Chiroptical Properties from Intrinsically Achiral Building Blocks of One-Dimensional CsPbBr3 Perovskite Nanowires, S Guha et al., J. Am. Chem. Soc. 146 (2024) 33883.
 
Speaker Bio 

https://sscu.iisc.ac.in/people/DDSarma/