# How to prevent recombination of carriers?

Let say we have a contact of an electron conductor and a hole conductor. How is it possible to prevent recombination of the carriers nearly completely? So, electrons do not suppose to fly or tunnel inside a hole conductor and contra, even if electric potential is applied? Could heterojunctions fit to this purpose?

• Detailed balance holds in equilibrium, so it’s kind of hard barring a depletion region between them. – Jon Custer Mar 23 at 23:01
• Could you explain it in a more detailed way? – John Smith Mar 23 at 23:09
• If $np > n_{i}^{2}$ there will be recombination. Period. – Jon Custer Mar 23 at 23:12