Pressure-Induced Emergence of Visible Luminescence in Lead Free Halide Perovskite Cs₃Bi₂Br₉: Effect of Structural Distortion

Debabrata Samanta; Pinku Saha; Bishnupada Ghosh; Sonu Pratap Chaudhary; Sayan Bhattacharyya; Swastika Chatterjee; Goutam Dev Mukherjee

doi:10.1021/acs.jpcc.0c10624

journal article·2021-02-18

Pressure-Induced Emergence of Visible Luminescence in Lead Free Halide Perovskite Cs₃Bi₂Br₉: Effect of Structural Distortion

Debabrata Samanta, Pinku Saha, Bishnupada Ghosh, Sonu Pratap Chaudhary, Sayan Bhattacharyya, Swastika Chatterjee, Goutam Dev Mukherjee

The Journal of Physical Chemistry C· Volume 125· Issue 6

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Abstract

We report a detailed high pressure study involving X-ray diffraction, Raman spectroscopy, and photoluminescence measurements on a model Pb-free solar cell material Cs 3 Bi 2 Br 9 halide perovskite. The sample starts showing photoluminescence in a broad range of 550–900 nm above 1.4 GPa, due to an isostructural transition to a distorted unit cell. Further enhancement in intensity with pressure is found to be driven by an increase in distortion of BiBr 6 octahedra. Electronic band structure calculations show the sample in the high pressure phase to be an indirect band gap semiconductor. The photoluminescence peak shows a kink at higher energy and a broad asymmetric peak at lower energies due to the recombination of free excitons and self-trapped excitons, respectively. The blue shift of the PL peaks until about 4.4 GPa can be related to the extensive structural distortion before the transition to lowest symmetry triclinic phase.

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Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Solid-state spectroscopy and crystallography · Optical properties and cooling technologies in crystalline materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

National Centre for High Pressure Studies, Department of Physical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur Campus, Mohanpur 741246, Nadia, West Bengal, India

Department of Chemical Sciences, and Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur 741246, India

Department of Earth Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur Campus, Mohanpur 741246, Nadia, West Bengal, India

Funding

Ministry of Earth Sciences · Department of Science and Technology, Ministry of Science and Technology

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