Publication date: 21st July 2025
Phase change materials (PCMs) have a sizeable latent heat associated with a first-order phase transition (solid-solid, solid-liquid), which renders them excellent candidates for thermal management applications, such as thermal energy storage and solid-state heat pumps and air- conditioners.[1] Among different PCMs, those undergoing solid-solid transitions are the most desirable due to the absence of fluid leakages.[2] To be implemented in most thermal management technologies, solid-solid PCMs should display an elusive combination of i) high thermal conductivity (>101 W m-1 K-1), which allows a rapid thermal exchange, and ii) high latent heat (> 102 J g-1), which minimizes the amount used in the devices.[3] Additionally, the phase change should occur at the desired temperature. Solid-solid PCMs displaying such a combination of properties have not been realized so far.
Two-dimensional (2D) halide perovskites are receiving renewed attention as an emerging class of solid-solid PCMs. Because the two sublattices are individually tunable, it has been proposed that these materials could exhibit a combination of high latent heat and thermal conductivity. In this talk, we will discuss our advancements in achieving Cu-based perovskites with the formula (CnH2n+1NH3)2CuX4 (X = Cl–, Br–), with even n = 16–22 that show a remarkable latent heat (67 J g-1) at relatively high temperatures (80–120 C). Additionally, we will show our recent efforts to increase the electrical and thermal conductivity of halide perovskite via internal charge-transfer doping.
This work has been funded by the EIC Pathfinder Challenge 2022 of the Horizon Europe Program under grant agreement 101114987, financed by the European Union. The authors are grateful for access to the ALBA Synchrotron at XALOC beamline for beamtime under proposal 2024018033. R.M. acknowledges support from Agencia Estatal de Investigación (RYC2021-031578-I, PID2022-137777NA-I00, CEX2021-001202-M).
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