Measurement of thermal transport properties of selected superlattice and thin films using frequency-domain photothermal infrared radiometry

Pawlak, M.; Jukam, Nathan; Kruck, Timo; Dziczek, D.; Ludwig, A.; Wieck, Andreas D.

doi:10.1016/j.measurement.2020.108226

Cited by 16 publications

(5 citation statements)

References 27 publications

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“…The amplitude and phase of the IR signal registered by the detector were processed by a lock-in amplifier (LIA, SR865) and analyzed by a computer for each modulation frequency. A detailed description of the PTR experimental setup is in refs and .…”

Section: Methodsmentioning

confidence: 99%

Light-Induced Thermal and Optical Behavior of Functionalized Side-Chain Push–Pull Azo Polymer Thin Films

et al. 2023

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In this work, we focus on the impact of UV/vis light on the physical properties of polymers with azo chromophores. We study the relationship between light, the structure of azo molecules, and their thermal and optical properties. Our research objects are functionalized side-chain push−pull mono and bis-azo polymer thin films (80−457 nm). We induced structural changes in the azo molecules by photoisomerization (applying light at 405 nm and 300 mW/cm 2 ), and we observed them by measuring the transmittance spectra. We characterized the local thermal conductivity (κ) of azo polymers by scanning thermal microscopy (SThM). We used quantum chemistry calculations to explain the thermal and optical reactions of the azo polymers to illumination by light. We also used photothermal radiometry to support SThM. We imaged the surfaces of azo polymers in their trans and cis states by atomic force microscopy. The SThM measurements show reversible κ changes for the azo polymer with CN groups, between 0.21 and 0.17 W m −1 K −1 for the trans and cis states, respectively.

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Section: Methodsmentioning

confidence: 99%

Light-Induced Thermal and Optical Behavior of Functionalized Side-Chain Push–Pull Azo Polymer Thin Films

et al. 2023

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“…Both these processes are determined by the energy band gap, carrier lifetime and thermal properties of the layer. BDS is therefore suitable for in-situ measurements, allowing continuous monitoring of the processes governing the synthesis of the layers, and determination of thermal, optical and transport properties of multilayered materials [ 20 , 21 , 22 , 23 ]. The use of BDS to characterize the charge and thermal transport offers the possibility to determine thermal diffusivity and conductivity, energy band gap and carrier lifetime of organic solar cells in a single analysis, while performing the measurements in a non-contact and non-destructive way [ 24 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of P3HT:PCBM Ratio on Thermal and Transport Properties of Bulk Heterojunction Solar Cells

et al. 2023

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The influence of P3HT:PCBM ratio on thermal and transport properties of solar cells were determined by photothermal beam deflection spectrometry, which is advantageous tool for non-destructively study of bulk heterojunction layers of organic solar cells. P3HT:PCBM layers of different P3HT:PCBM ratios were deposited on top of PEDOT:PSS/ITO layers which were included in organic bulk-heterojunction solar cells. The thermal diffusivity, energy gap and charge carrier lifetime were measured at different illumination conditions and with a different P3HT:PCBM ratios. As expected, it was found that the energy band gap depends on the P3HT:PCBM ratio. Thermal diffusivity is decreasing, while charge carrier lifetime is increasing with PCBM concentration. Energy band gap was found to be independent on illumination intensity, while thermal diffusivity was increasing and carrier lifetime was decreasing with illumination intensity. The carrier lifetime exhibits qualitatively similar dependence on the PCBM concentration when compared to the open-circuit voltage of operating solar cells under AM1.5 illumination. BDS and standard I-V measurement yielded comparable results arguing that the former is suitable for characterization of organic solar cells.

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“…In this case, the examined sample is regarded as a multilayered structure. Experimental consideration and theoretical modeling of these systems, aimed at the characterization of thin films, require simultaneous consideration of the influence of all layers (Cabrera et al, 2015;Korte and Franko, 2015;Markushev et al, 2017;Ordonez-Miranda et al, 2022;Pawlak et al, 2020Pawlak et al, , 2021. However, in PT methods, the applied high-absorbance layer may be much thinner than the examined thin film, reducing its influence on the effect of the surface absorption heat source as the generator of the measured signal (Galovic et al, 2014;Markushev et al, 2012;Nesic, Galovic, et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Influence of non-irradiated surface optical absorber on temperature gradient induced by photothermal effect in a thin film

Miletic

Popović

Galović

et al. 2022

Facta Univ Phys Chem Technol

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This paper presents the model of surface temperature variations, resulting from the photothermal effect induced in a ?thin film ? highly absorbing surface layer? structure, where the thin film is irradiated. The influence of the optical absorption coefficient and sample thickness on the induced temperature gradient is analyzed. It is shown that, depending on the product of these parameters (optical absorbance) in the described structure, the phenomenon of inverse temperature gradient can occur, further influencing the direction and the magnitude of thermoelastic displacement.

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Measurement of thermal transport properties of selected superlattice and thin films using frequency-domain photothermal infrared radiometry

Cited by 16 publications

References 27 publications

Light-Induced Thermal and Optical Behavior of Functionalized Side-Chain Push–Pull Azo Polymer Thin Films

Light-Induced Thermal and Optical Behavior of Functionalized Side-Chain Push–Pull Azo Polymer Thin Films

Influence of P3HT:PCBM Ratio on Thermal and Transport Properties of Bulk Heterojunction Solar Cells

Influence of non-irradiated surface optical absorber on temperature gradient induced by photothermal effect in a thin film

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