• March 7th, 2016

AFM for Analysis of Organic Solar Cell

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The organic solar cell device fabrication begins with a glass substrate that is coated with 300 nm of indium tin oxide (ITO) over most of the surface of the glass (one edge of the glass is left uncoated).ITO is a transparent conductive material that serves as our transparent electrode. This ITO-coated glass substrate was cleaned and then a 50 nm thick conductive buffer layer was deposited by spin coating an aqueous suspension of poly(3,4-ethylenedioxythiophene):polystyrene sulfonate, PEDOT:PSS, onto theITO-coated glass substrate (Figure 2a). Blended solutions of the donor and acceptor (the blend is denoted with a “:” between the electron donor and electron acceptor names, as in p-DTS(FBTTh2)2:PC71BM were spin cast at 1750 rpm for 60 seconds onto the PEDOT:PSS layer (Figure 2b). Patterned layers of calcium and aluminum were thermally evaporated onto the blended films through a patterned shadow mask at a pressure of 1 × 10−7 Torr using a vacuum thermal evaporator (Figure 2c). The resulting device looks like the diagram in Figure 3. For more information on this particular solar cell system, see DOI: 10.1002/adma.201201127.
Describe your results in details. Provide an assessment of what you see in the images, and consider how it relates to device performance. Compare the height and phase images and describe what you can learn from the combination of these images. Quantify the roughness of the images, and provide a detailed analysis of any features on the film surface (if applicable, otherwise note the lack of features). Use a cross-section of the data to show the profile of any notable features, and determine their size and regularity. (SOFTWARE USED: GWYDDION)

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