Hi, respected Scientists and Researchers , I'm reading an ariticle 'Self‐Powered Organic Photodetectors with High Detectivity for Near Infrared Light Detection Enabled by Dark Current Reduction'. The author gave an 'Film-depth-dependent absorption spectroscopy' (as shown in the figure below), and the author said that'D18 and Y6 are randomly distributed in the longitudinal range in the D18:Y6 film. However, D18/Y6 film possesses a vertical phase
separation with D18 enriched in the bottom'. ( The D18 film exhibits an absorption band at 410–620 nm, with a peak at 584 nm and a shoulder at 548 nm, while Y6 film possesses a
broad absorption in the range from 520 to 980 nm with a strong absorption peak at 840 nm）
now my question is how can I get that conclusion that the author gave us from the 'Film-depth-dependent absorption spectroscopy' ?
Thank you very much!
Dear Wang Ok! The key to understanding the data presented by you is as follows. If the impurity is distributed evenly over the depth of the material, we will get a linear dependence of the signal absorption by this impurity on the thickness of the material. If this dependence is nonlinear, it means that the impurity is unevenly distributed over the thickness
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