Efficient thermal conductance in organometallic perovskite CH3NH3PbI3 films

Abstract

Perovskite-based optoelectronic devices have shown great promise for solar conversion and other optoelectronic applications, but their long-term performance instability is regarded as a major obstacle to their widespread deployment. Previous works have shown that the ultralow thermal conductivity and inefficient heat spreading might put an intrinsic limit on the lifetime of perovskite devices. Here, we report the observation of a remarkably efficient thermal conductance, with a conductivity of 11.2 ± 0.8 W m−1 K−1 at room temperature, in densely packed perovskite CH3NH3PbI3 films, via noncontact time-domain thermal reflectance measurements. The temperature-dependent experiments suggest the important roles of organic cations and structural phase transitions, which are further confirmed by temperature-dependent Raman spectra. The thermal conductivity at room temperature observed here is over one order of magnitude larger than that in the early report, suggesting that perovskite device performance will not be limited by thermal conductance.

Diode-Pumped Organo-Lead Halide Perovskite Lasing in a Metal-Clad Distributed Feedback Resonator

“…Finite element heat transfer calculations based on the measured MAPbI 3 thermal conductivity ~11 W m -1 K -1 support this conclusion 28 and confirm that the laser architecture functions as an effective heat sink (see Supporting Fig. S2).…”

Thermal properties of metal-halide perovskites

“…59 Similar values were found for films using the time-domain thermo-reflectance (TDTR) method. 60 In striking contrast to all other reports, an extremely high thermal conductivity of densely packed MAPbI 3 films of 11.2 AE 0.8 W (m K) À1 at room temperature was claimed by Chen et al 62 On the other hand, consistent thermal conductivities were reported for single crystals (0.34 W (m K) À1 ) and densely packed thin perovskite films containing large crystals (0.33 W (m K) À1 ) using 3o-scanning near-field thermal microscopy. 61 In addition, the temperature-dependent thermal conductivity of MAPbI 3 was first measured around the tetragonal-cubic phase transition temperature.…”

Halide Perovskites: Thermal Transport and Prospects for Thermoelectricity

“…[ 75,76 ] Hybrid perovskite thin films also exhibited such characteristics. [ 77,78 ] Using the time‐domain thermoreflectance method, Luo et. al.…”

“…In an isolated case, a high κ of 11.2 Wm −1 K −1 was measured for densely packed MAPbI 3 films using the time‐domain thermal reflectance technique. [ 78 ] The reason behind this high value is yet to be known. Figure shows a summary of the literature room temperature in‐plane and cross‐plane κ for the halide perovskites in different forms (i.e., single crystalline, polycrystalline pellets, and thin films).…”