1. The problem statement, all variables and given/known data In a sample of GaAS at T=200k, we have experimentally determined that n0=5p0 and that Na=0. Calculate n0,p0, and Nd. 2. Relevant equations 3. The attempt at a solution Have solved that ni for GaAS at 200k is 1.2687cm-3. And using the mass action law equation, p0=ni2/5p0. I derived p0=0.567cm-3 , n0=5p0= 2.8363cm-3. Can someone confirm if it is right to say that the donor concentration, Nd is approximately equal to n0 in this case? Since the equilibrium equation state, if Nd >> ni, then n0 is approximately equal to Nd.