[Analysis Case] Evaluation of the Mixed State of the Active Layer in Organic Thin-Film Solar Cells
Evaluation of the distribution state of organic materials using low-energy STEM observation and EELS measurement.
By using low-energy STEM observation and STEM-EELS surface analysis, we evaluated the mixed state of the active layer in bulk heterojunction solar cells. For the evaluation, samples were prepared with only the active layer deposited on ITO. The contrast in the low-energy STEM image (Photo 1) corresponds to the elemental distribution of S and C in the STEM-EELS images (Photos 2 and 3), confirming that it reflects the bulk heterostructure. Additionally, a bias in the distribution of S was observed, suggesting that P3HT is segregated towards the surface side.
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Analysis of solar cells.