Efficient Thermal Conductance in Organometallic Perovskite CH3NH3PbI3 Films

TL;DR

This study reports a significantly higher thermal conductance in CH3NH3PbI3 perovskite films than previously observed, indicating better heat management and potential for improved device stability.

Contribution

The paper demonstrates a remarkably efficient thermal conductance in densely-packed perovskite films, challenging prior assumptions of ultralow thermal conductivity limiting device performance.

Findings

Thermal conductivity of 11.2 W/m·K at room temperature.

Temperature-dependent effects of organic cations and phase transitions.

Thermal stability is unlikely to limit device performance.

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 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 stability.