AI Article Synopsis
- * Using a powerful laser and specific optics, we achieved high light intensity in very small areas (< 100 μm), enabling precise measurements of how efficiently the devices convert light into electric current.
- * This approach allows for the quick creation of patterned metal films with tiny holes to improve electrical contact and helps us understand how light interacts with the active layer of these devices.
Article Abstract
We present a methodology for probing light-matter interactions in prototype photovoltaic devices consisting of an organic semiconductor active layer with a semitransparent metal electrical contact exhibiting surface plasmon-based enhanced optical transmission. We achieve high-spectral irradiance in a spot size of less than 100 μm using a high-brightness laser-driven light source and appropriate coupling optics. Spatially resolved Fourier transform photocurrent spectroscopy in the visible and near-infrared spectral regions allows us to measure external quantum efficiency with high sensitivity in small-area devices (<1 mm). This allows for rapid fabrication of variable-pitch sub-wavelength hole arrays in metal films for use as transparent electrical contacts, and evaluation of the evanescent and propagating mode coupling to resonances in the active layer.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4311927 | PMC |
| http://dx.doi.org/10.1080/09500340.2014.917731 | DOI Listing |
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