STEM与日常科技·英语30篇（6）

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为什么晴朗凉爽的天气更利于太阳能发电

Solar panels convert sunlight into electricity using photovoltaic cells made of silicon.
Though bright sun is essential, high temperatures actually reduce their efficiency by 0.3–0.5% per degree Celsius.
On hot days, electrons in the silicon become too energetic, causing more resistance and heat loss.
Cooler air improves heat dissipation, helping cells maintain optimal voltage and current output.
That’s why cities like Portland or Berlin often get more annual energy per panel than hotter places like Phoenix—despite fewer sunny hours.
Modern inverters also adjust voltage dynamically to match changing panel performance in real time.
Dust, snow, or shading from trees can cut output more than heat, so regular cleaning matters too.
Engineers now design bifacial panels that capture reflected light from rooftops or ground surfaces.
Researchers are testing perovskite layers to boost efficiency without raising operating temperatures.
So next time you see solar panels gleaming on a crisp autumn morning, remember: cool + sun = peak power.