Solar technology feels cutting-edge, but its roots go back nearly two centuries. The photovoltaic effect was first observed in **1839** by the French physicist **Edmond Becquerel**. At just 19 years old, he noted that certain materials generated a small electric current when exposed to light. However, for over a century, this remained a scientific curiosity with efficiencies too low for practical use.
The major turning point arrived in **1954**. Researchers at Bell Laboratories—Chaplin, Fuller, and Pearson—developed the first practical silicon solar cell. It had an efficiency of around **6%**, a massive leap from previous attempts. This invention marked the birth of modern photovoltaics.
Initially, the technology was astronomically expensive, finding its only viable market in space. Satellites required reliable energy autonomy, and cost was secondary. From the 1970s to the early 2000s, the industry slowly matured, improving manufacturing processes and material purity. Crystalline silicon emerged as the dominant technology due to its stability, setting the stage for the renewable energy revolution we see today.
