The region on either side of a p-n junction emptied of free charges is called the:

1. Electrons and holes diffuse across the junction and recombine. 2. That leaves a zone with no mobile carriers left. 3. This space-charge region on either side of the junction is known as the depletion region. 4. So the answer is the depletion region. _Source: syllabus Physics Part II, Ch 14 'Semiconductor Electronics'_