To further study these types of semiconductors, the research team used a detailed equilibrium model to measure the efficiency limits of different light-absorbing materials in different oceans and lakes around the world. These include relatively clean and light-absorbing parts of the Atlantic and pacific, and lakes in Finland, which are cloudy and have poor light absorption characteristics.
Find IC SDRAM/IC DRAM memory on Heisener. We provide you with detailed specification that facilitates your search for the ideal parts. Get a quote from us now.This model calculates the power conversion efficiency of underwater solar cells, which is derived from the ratio of the output power density p out to the power density pin input from the solar spectrum. Then, it measures the output power from the maximum power point on the solar cell current density-voltage (JV) curve, p out = J max V max, and measures pin in through the integrated photon flux density (ie the number of photons hitting the cell surface) Changes over time. By combining the given absorption spectrum with the semiconductor's band gap energy, the depth below sea level and the known values ??of water temperature, the researchers then obtained detailed equilibrium efficiency limits for semiconductor materials at different locations.
For their input data, the researchers screened more than 400 published articles to discover light absorption spectra that not only covered relevant spectral regions but also represented many regions of the earth. "We want to make sure that we consider not only the clearest sea water," R? Hr explained.
The calculation is described in detail in Joules. The calculation shows that at two meters deep, the solar cell absorber performs best at a band gap of 1.8 eV, while at 50 meters, the band gap is 2.4 eV. The equilibrium efficiency of the device varies from approximately 55% in shallow water to more than 65% at greater depths, while generating power greater than 5 mW / cm 2. These efficiencies increase in cold water, and the researchers found that the balance efficiency and power output are independent of geographic location. This is good news, because it means that solar cells can be customized to a specific working depth (rather than location).
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