Today we continued with photovoltaic devices and described how electrons flow through a photovoltaic consisting of silicon doped with boron and phosphorous. P-type and N-type semi-conductors were covered and how they come together to form a PN junction was also discussed (See Figure 12.12 on page 491). We also looked into how the substitution of boron and phosphorous facilitate the flow of electrons in a silicon based material and showed that only 15% of the sun's visible photons are absorbed in a silicon doped photovoltaic device.
Alternate Energy sources and fuel are also discussed on pages 195-198 of the text (note the correct of the page #'s mentioned in lecture) and the first part of this discussion is based on solar energy. Here is a link to a great web-site describing solar cells. We also highlighted the pros and cons of solar cells and indicated what the energy obtained from them depends on.
Inspirational Quote of the Day:
Take a moment to write down the following personal characteristics: confidence, poise, imagination, initiative, tolerance, humility, love, cheerfulness, faith, enthusiasm, courage, honesty, serenity.
Circle all of the characteristics you possess. I hope you circled them all because they are all within us.
Song Played Before Class:
Finger Eleven - Paralyzer
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