Electroluminescence images from one cell undergoing millions of mechanical cycles - Metadata

These are the images analyzed in the paper Millions of Small Pressure Cycles Drive Damage in Cracked Solar Cells. They are EL images taken from a PV module undergoing dynamic mechanical acceleration (DMX) cycles at 10 Hz at RMS pressure of 10 Pa, 30 Pa, 100 Pa, and 300 Pa. The data are from a one-time demonstration of in situ EL, so this is not a flawless dataset.

File names include an estimate of the cumulative number of cycles at the given pressure and an estimate of the phase of the sinusoid at which the image was collected. We collected 40 frames every 359 pressure cycles. The entire range of phases is covered with 40 images every 35.9 seconds in each 27.7-hour test. Images have been aligned to each other using optical flow. The controller crashed during the 10 Pa test, so there’s a gap in the imagery. We have no separate simultaneous measurement of phase, so it has been estimated from image intensity. This means the relative phase is correct (the phase labeled 0 is the same every time within each test) but it is not known how this state relates to the zero-deflection or the zero-pressure condition. DMX can take about 10 seconds, to reach steady state, so the beginning of each run is done at some pressure below the setpoint.

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