Organic electronics presents an emerging field for low-cost PV applications. The photo of the organic solar cell in the figure was taken using an optical microscope and a trans-polarizer and a Nomaschi filter.
The two moon-like circumferences are metal cathodes. Thermal annealing of these thin film devices can often improve their power conversion efficiency. This photo was taken with the thermal annealing temperature approaching the melting point of the battery component, thus forming a special stripe in the figure.
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