Lattice Energy Reservoir in Metal Halide Perovskites

Abstract

Figure 1. Scheme of lattice energy reservoir as dynamic nanodomain in halide perovskites. Blue LER: before energy storage, red LER: energy accumulation by phonon-lattice coupling, higher potential energy is established over the surrounding. (ph-phonon) Figure 2. (a) Scheme for LER suppress hot carrier cooling. The homojunction with strain of different lattice suppress thermal transport to the surrounding lattice and then induces acoustic-optical phonon upconversion. (b) Proposed phonon dynamics in Perovskites. The labeled phonon dynamic processes are (1) Fröhlich interaction of carriers primarily on the lead-halide framework; (2) relaxation of lead-halide LO phonon, organic sublattice can be excited by phonon–phonon scattering; (3) propagation of acoustic phonon is blocked due to anharmonic phonon–phonon scatterings; (4) upconversion of acoustic phonons; and (5) carrier reheating. (3) Reproduced with permission from ref (3). Copyright 2017 The Authors. Figure 3. PL enhancement in halide perovskites with continuous illumination at the time scale of seconds. PL Intensity (a) and PL decay curves (b) in MAPbI₃ nanoplatelet under continuous illumination (405 nm 200 mW/cm²). Figure 4. Schematic photobrightening by LER induced subgap carrier upconversion. (a) Without LER effect before illumination and (c) display a short carrier lifetime. (b) Upon illumination hot LERs form (red regions) and the subgap carrier can be upconverted back to the CB, (d) resulting in a significantly prolonged carrier lifetime. (TS: trapping/metastable states, ph: phonon, e: electron.) Figure 5. Schematic subgap electron upconversion driven by hot LERs under illumination. Figure 6. (a) Time-dependent PL spectra in MAPbBr₃ single crystal under 405 nm excitation at a fluence of 350 mW/cm². (b) Fluorescence intermittency in MAPbBr₃ single grain as a function of time under the continuous excitation of 405 nm. Dr Wen Xiaoming was awarded bachelor’s and master’s degrees from Zhejiang University, and a PhD from Swinburne University, Australia in 2007. From 1989 to 2003, he worked at Yunnan University as full professor and deputy head of department. He has performed research at the University of Melbourne, University of New South Wales, Swinburne University of Technology in Australia and Academia Sinica in Taiwan on ultrafast spectroscopy and photophysics of materials. He is currently a senior researcher and theme leader at RMIT University, focusing on the photophysics of perovskites and photovoltaic applications. Prof Baohua Jia was awarded a PhD from Swinburne University. She is a Fellow of Australian Academy of Technological Sciences and Technologies (FTSE), a Future Fellow of Australian Research Council and Founding Director of Centre for Atomaterials and Nanomanufacturing (CAN) at RMIT University, Australia. Professor Jia serves as Editor-in-Chief for NPJ Nanophotonics. Prof Jia is a Fellow of Optica, and a Fellow of the Institute of Materials, Minerals and Mining (FIMMM). Professor Jia’s research focuses on the design and optical characterization of novel nanostructures and nanomaterials, fabrication, and efficient conversion and storage of light energy. The authors acknowledge financial support from Australian Research Council through Future Fellowship (FT210100806), the Discovery Project (DP220100603), the Centre of Excellence Program (CE230100006) and Linkage (LP240100504, LE250100078) and from Australian Renewable Energy Agency (ARENA TM021). This article references 35 other publications. This article has not yet been cited by other publications.