Scanning near field thermal microscopy on a micromachined thin membrane

Altes, A.; Mutamba, K.; Heiderhoff, R.; Hartnagel, H. L.; Balk, L.J.

doi:10.1016/j.spmi.2003.09.008

Cited by 14 publications

(7 citation statements)

References 10 publications

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“…31 In particular, the local heat capacity is of interest, since it ultimately tells the ability to store the supplied heat, and variations thereof can even lead to discontinuous temperature gradients in dynamically operated electrical systems. 32 Until today, values of specific heat for lead halide perovskite thin films have been hardly available, since so far the heat capacity was measured only once for methylammonium trihalogenoplumbate (MAPbX 3 , X = I, Br, Cl) single crystals. 33 Since the crystal structure of CsPbBr 3 is isotropic, the local volumetric heat capacity of the corresponding film, which is given by the product of the local specific density ρ ⃗ r ( )…”

mentioning

confidence: 99%

Simultaneous Mapping of Thermal Conductivity, Thermal Diffusivity, and Volumetric Heat Capacity of Halide Perovskite Thin Films: A Novel Nanoscopic Thermal Measurement Technique

Haeger

Wilmes

Heiderhoff

et al. 2019

J. Phys. Chem. Lett.

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Local thermal conductivity, thermal diffusivity, and volumetric heat capacity of all-inorganic halide perovskite thin films are mapped simultaneously and with highest spatial resolution for the first time. These various thermal properties are detected by a scanning near-field thermal microscope operated at two different frequencies simultaneously. We apply this technique to analyze the thermal properties of halide perovskites on the nanoscale. In addition to an ultralow thermal conductivity of 0.43 ± 0.03 and 0.33 ± 0.02 W/(m•K), a low thermal diffusivity of 0.3 ± 0.1 mm 2 /s and a small heat capacity of 0.29 ± 0.9 and 0.18 ± 0.6 J/(g•K) are obtained for CsPbBr 3 and CsPb 2 Br 5 films, respectively. The findings of our thermal microscopy are of great general importance for the thermal design of thin-film devices based on halide perovskites, while the measurement technique itself is generally applicable for other thin-film optoelectronic materials.

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mentioning

confidence: 99%

Simultaneous Mapping of Thermal Conductivity, Thermal Diffusivity, and Volumetric Heat Capacity of Halide Perovskite Thin Films: A Novel Nanoscopic Thermal Measurement Technique

Haeger

Wilmes

Heiderhoff

et al. 2019

J. Phys. Chem. Lett.

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“…Thus, in between both these different ranges, the curve P (λ S ) can be approximated by a linear function including the coefficients k A and k B , and equation (2.11) indicating a slope of the curve which is reciprocal to λ S (like that within the high thermal conductivity range). These theoretical considerations for the medium thermal conductivity range have already been verified experimentally in [36]. Thus, the classification into different ranges of sample thermal conductivity makes the respective specific data analysis procedure for the determination of λ S clear.…”

Section: Experimental Verification Of Developed Theorymentioning

confidence: 70%

“…Consequently, only the near-field condition developed above enables the combination of the quantitative 3ω-method within the frequency domain and the resistive based SThM. The sample surface investigation characteristic of this thermal near-field technique has already been demonstrated in [34][35][36].…”

Section: Near-field Interaction Of Thermal Probe and Samplementioning

confidence: 99%

Quantitative dynamic near-field microscopy of thermal conductivity

Altes

Heiderhoff

Balk

2004

J. Phys. D: Appl. Phys.

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A new three-dimensional finite element method model of the conventional resistive thermal probe, usually employed within scanning thermal microscopy (SThM) has been developed. As a result, the line heat source characteristic of the bent thermal sensitive filament seems to permit the explanation of the experimental results within a certain frequency range. The verification of this line heat source characteristic of the thermal probe finally leads to the introduction of a general near-field condition of SThM, which considers the spatial and temporal characteristic of the heat source. Here, the contact area between the probe and the sample is not considered as the source but rather as the aperture between the heat source and the sample. In addition, the combination of this kind of thermal probe with the so-called 3ω-method has been justified for the quantitative determination of the local thermal conductivity. Moreover, the applicable sample thermal conductivity range has been expanded significantly by considering the varying heat flow into the sample within the conditional equation.

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“…r c r is of interest, as it ultimately tells the ability to store the supplied heat. Variations of c vol ( )  r can even lead to discontinuous temperature gradients in dynamically operated electrical systems [43]. Assuming isotropic heat transport as the most simple approximation, an average volumetric heat capacity of 0.9 ± 0.1 J/(cm 3 K) and 0.5 ± 0.2 J/(cm 3 K) results for the 3D and 0D regions of the perovskite film, respectively (see figure 2(b)).…”

Section: Mapping Thermal Properties Of Cs X Pb Y Cl Z Perovskite Thinmentioning

confidence: 99%

Thermal properties of CsPbCl₃ thin films across phase transitions

et al. 2020

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The local thermal conductivity, thermal diffusivity, and volumetric heat capacity of cesium lead chloride perovskite thin films are mapped simultaneously and with highest spatial resolution by a scanning near-field thermal microscope. Both, the 3D phase (CsPbCl 3 ) and the 0D phase (Cs 4 PbCl 6 ) are investigated. For CsPbCl 3 thin films the variation of the thermal properties across the phase transitions in the range from room-temperature to 65°C are analyzed. While the thermal conductivity at room temperature is ultra-low, a significant increase of the thermal conductivity is found for the cubic phase of CsPbCl 3 (T>46°C). While only slight variations in the thermal conductivity are detectable for transitions from the monoclinic to the orthorhombic to the tetragonal phase, thermal diffusivity and volumetric heat capacity measurements are extremely sensitive to the amount of heat involved in the respective transition. It is shown that upon transition to the cubic phase of CsPbCl 3 thin films, the relative increase of the volumetric heat capacity is significantly higher than that of the thermal conductivity. Thus, the thermal diffusivity in the cubic phase becomes notably lower in comparison to that of the respective phase at room temperature. An increase of the volumetric heat capacity had been theoretically predicted earlier but could not be confirmed in previous experimental studies. The findings of our thermal analysis are of great general importance for fundamental material research and for the thermal design of thin-film devices based on CsPbCl 3 perovskites.

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Scanning near field thermal microscopy on a micromachined thin membrane

Cited by 14 publications

References 10 publications

Simultaneous Mapping of Thermal Conductivity, Thermal Diffusivity, and Volumetric Heat Capacity of Halide Perovskite Thin Films: A Novel Nanoscopic Thermal Measurement Technique

Simultaneous Mapping of Thermal Conductivity, Thermal Diffusivity, and Volumetric Heat Capacity of Halide Perovskite Thin Films: A Novel Nanoscopic Thermal Measurement Technique

Quantitative dynamic near-field microscopy of thermal conductivity

Thermal properties of CsPbCl₃ thin films across phase transitions

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Scanning near field thermal microscopy on a micromachined thin membrane

Cited by 14 publications

References 10 publications

Simultaneous Mapping of Thermal Conductivity, Thermal Diffusivity, and Volumetric Heat Capacity of Halide Perovskite Thin Films: A Novel Nanoscopic Thermal Measurement Technique

Simultaneous Mapping of Thermal Conductivity, Thermal Diffusivity, and Volumetric Heat Capacity of Halide Perovskite Thin Films: A Novel Nanoscopic Thermal Measurement Technique

Quantitative dynamic near-field microscopy of thermal conductivity

Thermal properties of CsPbCl3 thin films across phase transitions

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Thermal properties of CsPbCl₃ thin films across phase transitions