Commit 628a7629 authored by Simon Spannagel's avatar Simon Spannagel
Browse files

Mobility: add "constant" model for convenience

parent c82bf132

doc/usermanual/chapters/models.tex

+15 −0
Original line number Diff line number Diff line
@@ -223,6 +223,21 @@ where $\mu_{m}(N)$ is the Masetti mobility from Equation~\eqref{eq:mob:mas}, and 


This model can be selected in the configuration file via the parameter \parameter{mobility_model = "masetti_canali"}.



\subsection{Constant Mobility}



Some materials require constant charge carrier mobility values $\mu = \textrm{const}$.

This can be simulated with this model, which can be selected in the configuration file via the parameter \parameter{mobility_model = "constant"}.

It requires the additional configuration keys \parameter{mobility_electron} and \parameter{mobility_hole} to be present in the module configuration section, for example:



\begin{minted}[frame=single,framesep=3pt,breaklines=true,tabsize=2,linenos]{ini}

# Constant mobility for electrons and holes in CdZnTe:

mobility_model = "constant"

mobility_electron = 1000cm*cm/V/s

mobility_hole = 50cm*cm/V/s

\end{minted}



For more complex mobility dependencies the custom mobility model described below should be used.



\subsection{Custom Mobility Models}

\apsq provides the possibility to use fully custom mobility models.

In order to use a custom model, the parameter \parameter{mobility_model = "custom"} needs to be set in the configuration file.

src/physics/Mobility.hpp

+21 −0
Original line number Diff line number Diff line
@@ -281,6 +281,24 @@ namespace allpix { 
        double alpha_;

    };



    /**

     * @ingroup Models

     * @brief Constant mobility of electrons and holes

     */

    class ConstantMobility : public MobilityModel {

    public:

        ConstantMobility(double electron_mobility, double hole_mobility)

            : electron_mobility_(electron_mobility), hole_mobility_(hole_mobility) {}



        double operator()(const CarrierType& type, double, double) const override {

            return (type == CarrierType::ELECTRON ? electron_mobility_ : hole_mobility_);

        };



    private:

        double electron_mobility_;

        double hole_mobility_;

    };



    /**

     * @ingroup Models

     * @brief Custom mobility model for charge carriers
@@ -374,6 +392,9 @@ namespace allpix { 
                    model_ = std::make_unique<MasettiCanali>(temperature, doping);

                } else if(model == "arora") {

                    model_ = std::make_unique<Arora>(temperature, doping);

                } else if(model == "constant") {

                    model_ = std::make_unique<ConstantMobility>(config.get<double>("mobility_electron"),

                                                                config.get<double>("mobility_hole"));

                } else if(model == "custom") {

                    model_ = std::make_unique<Custom>(config, doping);

                } else {