Once all the pores have been cycled, calculate the total porosity summing all the areas of the different bins and dividing by the total area of the image (multiply the shape x and y of the composed image).Draw and fill the area of the pore in the composed color image with the corresponding to the pose color based on its size.Add the area of the pore to the total area of the corresponding histogram bin.Classify the pore diameter in the pore size histogram bins specified in the main program as a python list.Multiply the Diameter by the scale to obtain diameter in microns.With the total pixels of the pore, calculate the diamter of the pore equating it to the area of the pore in pixels.Cycle through all the contours and for each contour (pore) draw it in a blank image and count the non-zero pixels, this gives the total pixels of the pore.Find the contours of the pores in the binary image using findContours funtion from OpenCV.Threshold the image into a binary file in the HSV color space using the HSV limits entered by the user (pores are white and minerals are black).The pore area is calculated using opencv, with the following sequence: This program uses Tkinter library to make a GUI interface. Save the report to a file to be copied into our reports.Avoid having to input the histogram bin limits each time (needed at least in JMicroVision).Add the scale line and number to the image.Reduce image size for JMicroVision to allow it (it seems there is a size limitation).Add black lines divinding the images to avoid the software to connect pores from different images.The objective of the project was to facilitate the work of the geologists automation the following tasks: The work of calculating porosity can be done using free available software like JMicroVision, but many of the tasks involved make the whole process really slow (usually more that 10 minutes per sample). Usually four microscopic photographs are taken to have a more representative samplig of the thin section. During the preparation of the Thin Section, pores are filled with a blue resin that when photographed in a microscope, allows you to differentiate the pores from the rest of the minerals. In petroleum geology, calculating the porosity of a rock sample is important and is part of the routine geological analysis. Thin Sections are 30 micron slices of rock used in Geology to describe the minerals present in the rock sample. Science 2016, 351, 1/ project application calculates the total porosity of a thin section and a histogram of pore sizes. A mixed-cation lead mixed-halide perovskite absorber for tandem solar cells. Chemical Management for Colorful, Efficient, and Stable Inorganic–Organic Hybrid Nanostructured Solar Cells. Metal-halide perovskites for photovoltaic and light-emitting devices. Organometal Halide Perovskites as Visible-Light Sensitizers for Photovoltaic Cells. These findings offer new routes to developing efficient solar cells through reproducible control of crystal morphology and composition.Ĭopyright © 2020 American Chemical Society. Furthermore, we found substrate temperature directly affects the adsorption rate of CH 3NH 3I, thus impacting crystal formation and hence solar cell device performance via changes to the conversion rate of PbI 2 to CH 3NH 3PbI 3 and stoichiometry. We isolated the effects of substrate temperature on crystal growth by developing a new method to control sublimation of the organic precursor, and CH 3NH 3PbI 3 solar cells deposited in this way yielded a power conversion efficiency of up to 18.2%. Films co-deposited onto a cold (-2 ☌) substrate exhibited large, micrometer-sized crystal grains, while films that formed at room temperature (23 ☌) only produced grains of 100 nm extent. We demonstrate accurate control of crystallite size in CH 3NH 3PbI 3 thin films by regulating substrate temperature during vacuum co-deposition of inorganic (PbI 2) and organic (CH 3NH 3I) precursors. Understanding and controlling grain growth in metal halide perovskite polycrystalline thin films is an important step in improving the performance of perovskite solar cells.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |