Abstract
A solar panel gets hot as it works up on the roof, yet photoinduced self-heating is often ignored when characterizing lab-sized samples. The authors present their understanding of the turnover effect in measurements of open-circuit voltage versus light intensity (Suns-${V}_{O\phantom{\rule{0}{0ex}}C}$ curves), which is identified as a unique feature of all semiconductor-based solar cells. This effect is explained in terms of electrothermal feedback arising when the incident irradiation heats up the device. The authors' model fully explains the experimental data, and allows one to determine key device parameters such as the ideality factor and the band gap from a single measurement.
Highlights
Solar panels heat up upon intense solar radiation due to excess energy dissipation of the absorbed photons or by nonradiative recombination of charge carriers
For light-intensity-dependent measurements of the opencircuit voltage (Suns-VOC), allowing us to characterize the recombination mechanism, sample heating is often not considered, almost 100% of the absorbed energy is converted into heat
The relaxation of charge carriers created by photons with energies larger than the optical gap accounts for about 30% of the absorbed energy [1]
Summary
Solar panels heat up upon intense solar radiation due to excess energy dissipation of the absorbed photons or by nonradiative recombination of charge carriers. For light-intensity-dependent measurements of the opencircuit voltage (Suns-VOC), allowing us to characterize the recombination mechanism, sample heating is often not considered, almost 100% of the absorbed energy is converted into heat.
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