研究目的
To directly determine the total hemispherical emittance of perovskite and silicon solar cells over their operating temperature range using a rapid transient calorimetry method.
研究成果
The developed transient calorimetry method allows for the direct determination of total hemispherical emittance of solar cells in a single measurement. It was found that the total hemispherical emittance is influenced by the encapsulation material and the type of rear electrode, with values lower than spectral emittance previously measured. This has implications for the thermal management of photovoltaic systems, especially in building-integrated photovoltaics.
研究不足
The method assumes the sample is enclosed in a black body isothermal emitting cavity, which may not be perfectly achieved. The error in emittance calculation increases with temperature, being less than 7% at 90°C.
1：Experimental Design and Method Selection:
A transient calorimetry method based on Stefan-Boltzmann’s law was developed for determining total hemispherical emittance. The method involves heating the sample and measuring its temperature rate of change during cooling.
2：Sample Selection and Data Sources:
High- and low-emittance references, commercial poly-crystalline Si solar cells, high-efficiency PERL Si solar cells, and thin-film FA0.3MA0.7PbI3 perovskite solar cells were measured.
3：3MA7PbI3 perovskite solar cells were measured.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: A vacuum chamber, halogen lamp as a radiation source, water filter, focusing lens, thermocouples, and data logger were used.
4：Experimental Procedures and Operational Workflow:
The sample was heated to a target temperature, then cooled, and the temperature rate of change was recorded. The cooling curves were measured three times for each sample.
5：Data Analysis Methods:
The total hemispherical emittance was calculated from the temperature rate of change during cooling, considering radiative, conductive, and convective heat losses.
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