rm useless section, use only sss instead of ss2

02_carrier_transport.tex

@@ -26,11 +26,8 @@ Which gives us the useful relation:
     n_i = \sqrt{N_cN_v}e^{-(E_c-E_v)/2kT} = \sqrt{N_cN_v}e^{-E_g/2kT}
 \end{equation}
 
-\subsubsection{Temperature dependance}
-Looking at the equations in \autoref{label:sec:fermi} we see that the higher the temperature or the lower the band-gap, the more electrons and holes are created.
 
-\subsection{Carrier transport}
-\subsubsection{Thermal equilibrium}
+\subsection{Behaviour in thermal equilibrium}
 \begin{align}
     \lambda & \equiv \text{mean free path} [cm]                   \\
     \tau_c  & \equiv \text{mean time between collisions} [s^{-1}] \\
@@ -39,7 +36,7 @@ Looking at the equations in \autoref{label:sec:fermi} we see that the higher the
 \end{align}
 
 
-\subsubsection{Drift velocity}
+\subsection{Drift velocity}
 Quick electromag recap: (for holes use + and $m_p$)
 \begin{align}
     F    & = -qE             \\
@@ -51,7 +48,7 @@ Average drift velocity:
     v_d = \pm \frac{qE\tau_c}{2m_{n,p}}
 \end{equation}
 
-\subsubsection{Mobility}
+\subsection{Mobility}
 For the sake of simplicity, let's define mobility for both holes and electrons.
 (These values are usually found in diagrams.)
 \begin{align}
@@ -61,7 +58,7 @@ For the sake of simplicity, let's define mobility for both holes and electrons.
     \mu_n     & >_mu_p
 \end{align}
 
-\subsubsection{Drift current}
+\subsection{Drift current}
 For the net drift current density slap together velocity, density and charge.
 \begin{equation}
     label{eq:drift_current}
@@ -79,7 +76,7 @@ Which gives us different resistances for n and p type semiconductors.
 \end{align}
 
 
-\subsubsection{Diffusion current}
+\subsection{Diffusion current}
 If there is a concentration gradient, the carriers will diffuse to equalize the concentration. Here flux $F \ [cm^{-2}s^{-1}]$ is the number of electrons/holes per unit area per unit time.
 \begin{align}
     F_n & = -D_n\frac{\mathrm{d} n}{\mathrm{d} x} \\
@@ -94,12 +91,12 @@ Which gives us the diffusion current density:
 \end{align}
 
 
-\subsubsection{Einstein relation between mobility and diffusion coefficient}
+\subsection{Einstein relation between mobility and diffusion coefficient}
 \begin{equation}
     \frac{D_n}{\mu_n} = \frac{D_p}{\mu_p} = \frac{kT}{q^2}
 \end{equation}
 
-\subsubsection{Total current}
+\subsection{Total current}
 \begin{alignat}{2}
     J_{total} & =J_n+J_p                &  &                                                 \\
     J_n       & =J_n^{drift}+J_n^{diff} &  & =qn\mu_nE+qD_n\frac{\mathrm{d} n}{\mathrm{d} x} \\