Recently, following the experimental observation that quantum effects are local- ized in restricted zone of the device, some quantum-classical hybrid models have been introduced. In the hybrid framework, just a well localized (and usually small) part of the device is modeled as quantum, while the rest of the domain is treated classically. The main difficult is to establish a reasonable set of interface conditions. In the talk we present and compare two different approaches. In the first one, following the available literature, we introduce and discuss some sets physical-based interface conditions. In the second one, we derive a new intrinsic hybrid model, obtained modifying the Bohm potential. In this way, we do not need any interface condition and the existence of the hybrid solution is obtained as a limit of a suitably modified quantum model.