Electric field → charge density

The electric field in a silicon diode is described by,

$\vec{E} = -1.2\times 10^5 \exp\left( -10^{10}(-3x+5y)^2\right)\hat{x}+2.0\times 10^5\exp\left( -10^{10}(-3x+5y)^2\right)\hat{y}$ [V/m].

Here $x$ and $y$ are measured in meters. What is the charge density in this region?

The relative dielectric constant of silicon is $\epsilon_r=12$. The permeability constant is $\epsilon_0=8.85\times 10^{-12}$ F/m.

$\rho =$ [C/m³]