Time-resolved vibrational-pump visible-probe spectroscopy for thermal conductivity measurement of metal-halide perovskites.

Shunran Li, Zhenghong Dai, Linda Li, N. Padture, Peijun Guo
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引用次数: 4

Abstract

Understanding thermal transport at the microscale to the nanoscale is crucially important for a wide range of technologies ranging from device thermal management and protection systems to thermal-energy regulation and harvesting. In the past decades, non-contact optical methods, such as time-domain and frequency-domain thermoreflectance, have emerged as extremely powerful and versatile thermal metrological techniques for the measurement of material thermal conductivities. Here, we report the measurement of thermal conductivity of thin films of CH3NH3PbI3 (MAPbI3), a prototypical metal-halide perovskite, by developing a time-resolved optical technique called vibrational-pump visible-probe (VPVP) spectroscopy. The VPVP technique relies on the direct thermal excitation of MAPbI3 by femtosecond mid-infrared optical pump pulses that are wavelength-tuned to a vibrational mode of the material, after which the time dependent optical transmittance across the visible range is probed in the ns to the μs time window using a broadband pulsed laser. Using the VPVP method, we determine the thermal conductivities of MAPbI3 thin films deposited on different substrates. The transducer-free VPVP method reported here is expected to permit spectrally resolving and spatiotemporally imaging of the dynamic lattice temperature variations in organic, polymeric, and hybrid organic-inorganic semiconductors.
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金属卤化物钙钛矿热导率测量的时间分辨振动泵可见探针光谱。
了解从微尺度到纳米尺度的热传输对于从设备热管理和保护系统到热能调节和收集的广泛技术至关重要。在过去的几十年里,非接触式光学方法,如时域和频域热反射,已经成为测量材料导热系数的极其强大和通用的热计量技术。在这里,我们报告了通过开发一种称为振动泵可见探针(VPVP)光谱的时间分辨光学技术来测量典型金属卤化物钙钛矿CH3NH3PbI3 (MAPbI3)薄膜的导热性。VPVP技术依靠飞秒中红外光泵浦脉冲对MAPbI3进行直接热激发,然后利用宽带脉冲激光在ns到μs的时间窗内探测可见光范围内的时间相关光透射率。利用VPVP方法,我们测定了沉积在不同基底上的MAPbI3薄膜的热导率。本文报道的无传感器VPVP方法有望对有机、聚合物和混合有机-无机半导体中的动态晶格温度变化进行光谱解析和时空成像。
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