Fascinating halide perovskites: Beyond the usual optoelectronic properties

Seminar
Colloquium
מועמד למחלקה
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Speaker
D. D. Sarma
Date
Add to Calendar 2026-11-03 11:00:00 2026-11-03 11:00:00 Fascinating halide perovskites: Beyond the usual optoelectronic properties Solid State & Structural Chemistry Unit, Indian Institute of Science, Bengaluru 560012, IndiaThe last fifteen years have seen the most spectacular rise of a class of materials centred around the hybrid halide perovskite, MAPbI3. Their optoelectronic properties, primarily photovoltaic, light-emissive, and detection, have reached superlative performance levels in this exceptionally short period and have taken the world by surprise.Here, however, we shall discuss a few fascinating properties of this family of compounds that are beyond the much-discussed optoelectronic properties.1-3 The first example1 deals with the realisation that the thermal conductivities of MAPbI3 and related compounds are not only ultra-low but also considerably lower than the minimum thermal conductivities expected from such materials in the extremely disordered, glassy limit. We probe this issue to understand how the thermal conductivity of an evidently crystalline solid can be lower than its glassy minimum thermal conductivity limit. In the second example,2 we show that MAPbI3 has the extraordinary ability to encode its thermal history in its structural evolution within the hysteretic region of its first-order phase transition; we further show that the photoluminescence signal provides a convenient and robust readout method for probing these unique microstates with extreme accuracy. Finally, we shall present3 the intriguing temperature and composition dependencies of the photoluminescence from FAxMA1–xPbI3 to suggest nontrivial electronic structure modifications, pointing to a possible resolution of the longstanding debate about the possibility of ferroelectricity in these materials.References: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, 2128, (2024). Evidence of Athermal Metastable Phase in a Halide Perovskite: Optically-TrackedThermal-Breach-Memory, Kingshuk Mukhuti et al., Phys. Rev. Lett. 134, 076901 (2025). A. Mohanty et al, Unpublished results. Nano bldg. המחלקה לפיזיקה physics.dept@mail.biu.ac.il Asia/Jerusalem public
Place
Nano bldg.
Abstract

Solid State & Structural Chemistry Unit, Indian Institute of Science, Bengaluru 560012, India

The last fifteen years have seen the most spectacular rise of a class of materials centred around the hybrid halide perovskite, MAPbI3. Their optoelectronic properties, primarily photovoltaic, light-emissive, and detection, have reached superlative performance levels in this exceptionally short period and have taken the world by surprise.

Here, however, we shall discuss a few fascinating properties of this family of compounds that are beyond the much-discussed optoelectronic properties.1-3 The first example1 deals with the realisation that the thermal conductivities of MAPbI3 and related compounds are not only ultra-low but also considerably lower than the minimum thermal conductivities expected from such materials in the extremely disordered, glassy limit. We probe this issue to understand how the thermal conductivity of an evidently crystalline solid can be lower than its glassy minimum thermal conductivity limit. In the second example,2 we show that MAPbI3 has the extraordinary ability to encode its thermal history in its structural evolution within the hysteretic region of its first-order phase transition; we further show that the photoluminescence signal provides a convenient and robust readout method for probing these unique microstates with extreme accuracy. Finally, we shall present3 the intriguing temperature and composition dependencies of the photoluminescence from FAxMA1–xPbI3 to suggest nontrivial electronic structure modifications, pointing to a possible resolution of the longstanding debate about the possibility of ferroelectricity in these materials.

References:

  1. 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, 2128, (2024).

 

  1. Evidence of Athermal Metastable Phase in a Halide Perovskite: Optically-Tracked

Thermal-Breach-Memory, Kingshuk Mukhuti et al., Phys. Rev. Lett. 134, 076901 (2025).

 

  1. A. Mohanty et al, Unpublished results.

תאריך עדכון אחרון : 01/11/2026