posted on 2023-01-06, 20:14authored byDong Liu, Hua Li, Yusheng Li, Taro Toyoda, Koji Miyazaki, Shuzi Hayase, Chao Ding, Qing Shen
Metal halide perovskite possesses many excellent properties
beneficial
to its potential applications in optoelectronics and pyroelectricity.
Surface recombination velocity, electronic diffusivity, and excess
carrier lifetime accounting for the photoexcited carrier recombination
and electronic transport features are key for improving the performance
of perovskite-based optoelectronic devices. Meanwhile, the thermal
conductivity and thermal diffusivity in halide perovskite have been
paid limited attention despite their potential practical applications
such as heat management and thermoelectric materials. To date, lots
of techniques have been developed to extract these physical properties,
while very few of them can effectively and nondestructively receive
the results. The photoacoustic (PA) technique based on photothermal
conversion is a powerful method to study the optical, electronic,
and thermal properties of various materials, especially semiconductor
materials. Optical absorption spectrum, surface recombination velocity,
electronic diffusivity, photoexcited carrier lifetime, and thermal
diffusivity can be obtained simultaneously without the destruction
and contact of the samples. Here, for the first time, we utilized
the PA technique in the perovskite single crystal. Optical absorption
of MAPbBr3 and MAPbI3 (MA = methylammonium)
single crystals was investigated under a reflection detection configuration
(RDC), and the electronic and thermal properties were measured under
a transmission detection configuration (TDC). Comparing the results
with previous reports and other characterizations, the PA technique
has been verified to be an efficient and convenient method to study
the optical, electronic, and thermal properties of perovskite single
crystals.