Hacker News Top Stories with Summaries (April 11, 2024)
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<h1> Hacker News Top Stories</h1>
<p>Here are the top stories from Hacker News with summaries for April 11, 2024 :</p>
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Stacking Triangles for Fun and Profit
Summary: In this article, the author presents a geometric approach to understanding trigonometric functions sine and cosine, starting from their geometric definitions. By proving angle addition formulas using geometric methods, the author derives analytic definitions and connects them to other results. This approach aims to provide a more intuitive and pedagogically sound way to teach trigonometry, grounding the concepts in geometric principles.
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Roll-to-roll fabricated perovskite solar cells under ambient room conditions
Summary: Researchers have demonstrated the first entirely roll-to-roll fabricated perovskite solar cell modules under ambient room conditions. The modules, produced using industrial roll-to-roll printing tools, replace costly vacuum-deposited metal electrodes with printed carbon electrodes. The optimized roll-to-roll fabricated hybrid perovskite solar cells show power conversion efficiencies of up to 15.5% for individual small-area cells and 11.0% for large-area modules. A cost of ~$0.7/W is predicted for a production rate of 1,000,000 m² per year in Australia, with potential for further cost reductions.