论文标题
时间分辨的振动泵可见探针光谱法，用于用于金属 - 大壁的钙钛矿的热导率测量
Time-resolved vibrational-pump visible-probe spectroscopy for thermal conductivity measurement of metal-halide perovskites
论文作者
论文摘要
了解微观到纳米级的热传输对于从设备热管理和保护系统到热能调节和收获的广泛技术至关重要。在过去的几十年中，非接触式光学方法（例如时域和频域热心率（TDTR和FDTR））已成为极力强大且功能多功能的热学分技术，用于测量材料导热率。在这里，我们通过开发一种称为振动性可见光 - 可见光探针（VPVP）光谱的晶状体金属 - 甲基钙钛矿（MAPBI3）（MAPBI3）（MAPBI3）的薄膜（MAPBI3）的薄膜的热导率的测量。 VPVP技术依赖于飞秒（FS）中红外（miR）光泵脉冲对MAPBI3的直接热激发，这些光泵脉冲可波长触发材料的振动模式，此后，使用宽带的宽度pulsed pulsed pulsed pulsed pulsed pulser pulse puls在NS中探究了依赖时间的光学透射率。使用VPVP方法，我们确定沉积在不同底物上的MAPBI3薄膜的热导率。预计此处报道的无频率VPVP方法可以允许在有机，聚合物和杂化有机无机半导体的动态晶格温度变化方面进行频繁解决和空间成像。
Understanding thermal transport at the micro- to 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 (TDTR and FDTR) 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 (fs) mid-infrared (MIR) 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 us 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 the dynamic lattice temperature variations in organic, polymeric, and hybrid organic-inorganic semiconductors.
