In this paper, the two class mixed boundary value problems of the quantum hydrody-namic model for semiconductors in thermal equilibrium are investigated. 1. Unipolar case :where w0,V0 ∈ H1(Ω) ∩ L∞(Ω), w0 ≥ 0 in Ω(?) Rd, 1≤ d < +∞, v is the outer unit normal on ΓN. We show the existence and uniqueness of the solution and perform the semi-classical limit of the above system. 2. Bipolar case :where u0, w0, V0 ∈ H1(Ω) ∩ L∞(Ω), u0, w0 ≥ 0 in Ω (?) Rd, 1 ≤ d ≤ 2, v is the outer unit normal on ΓN. We show the existence and uniqueness of the solution of the above system.
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