Troubleshooting Semiconductor Problems: Calculating Ef - Ev at T=300K

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To calculate Ef - Ev for silicon at T=300K with an acceptor impurity density of Na=7*10^15 cm^-3, the formula Ef - Ev = KT ln(Nv/Na) is used. The primary challenge in the calculation is the lack of the value for Nv, the effective density of states in the valence band. Participants are encouraged to refer to external resources for assistance in obtaining the Nv value. The discussion emphasizes the importance of accurate parameters for semiconductor calculations. Assistance from knowledgeable individuals is sought to resolve this issue.
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Question:

Silicon at T=300k contains acceptor impurity atoms at a density of Na=7*10^15 cm^-3. Determine Ef - Ev.

My solution:

By using the formula Ef -Ev= KT ln(Nv/Na) fermi energy type I had trouble computing this formula due to not having the value of Nv. So, I would appreciate if anyone who has the know how to help me obtain Nv?
 
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Thanx so much.
 

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