Boltzmann Boltzmann-Poisson Boltzmann-Poisson system Boltzmann-poisson Electron phonon Electron scattering Electron transport Electron transport properties Electron-phonon collision Electron-phonon collisions Galerkin methods Phonons Random variables Semiconductors Stochastic Galerkin Stochastic Galerkin methods Stochastic galerkin Stochastic models Stochastic systems Stochastics Uncertainty biomolecular modeling collocation method radial basis functions stochastic non-linear Poisson–Boltzmann equation