In order to produce a p-type semiconductor, silicon is to be doped with Al and the final product is to have a room temperature resistivity of 105ohmm. If the mobility of holes in silicon is 0.35m2/voltssec, calculate the concentration of Al required (in ppm ) assuming that each Al atom contributes one carrier. Hint: =nq,q=1.61019 coulomb,k=8.62105eV/K Atomic weight of Si=28gr,N0=6.021023 atoms /mole Silicon is diamond cubic with unit cell edge length of 5.43A