Built on the finite element drift-diffusion method, CHARGE provides designers with the correct tools for comprehensive charge transport simulation in active photonic and optoelectronic semiconductor devices. CHARGE self-consistently solves the system of equations describing electrostatic potential (Poisson’s equations) and density of free carriers (drift-diffusion equations). Automatic and guided mesh refinement tools are provided to achieve accuracy while minimizing computational effort.

Key Applications

• Photovoltaic devices

• Electro-optic modulators

• Image sensors

• Semiconductor devices

• Avalanche photodiodes 

  Except for below applications, you can find more examples onApplication Gallery



Key Features

Finite Element IDE


  • 1D/2D/3D modeling 
  • Import STL, GDSII, and STEP 
  • Parameterizable simulation objects
  • Domain partitioned solids for easy property definition 
  • Geometry-linked sources and monitors 
  • Automatic mesh refinement based on geometry, materials, doping, refractive index, and optical or heat generation



Comprehensive Material Models

  • Flexible visual database 
  • More than 500 customizable electronic and thermal properties and models for accurate simulation of complex effects
  • Scriptable material properties






Charge Transport Solver

  • 2D/3D finite element Poisson/drift-diffusion solver 
  • Steady-state, small signal AC and transient simulation   
  • Isothermal, non-isothermal, electro-thermal simulation 
  • Comprehensive semiconductor material models 
  • Includes electrical, optical, and thermal stimuli 
  • Automated finite element mesh generation based on doping, optical, and thermal profiles



Self-consistent Charge/Heat Modeling

  • Self-heating effects 
  • High-current devices
  • Requires both CHARGE and HEAT licenses



Highly integrated interoperable solvers

  • Self-consistent charge and heat transport simulation 
  • Perform multiphysics simulations 
  • Photovoltaic (FDTD/DGTD, CHARGE & HEAT) 
  • Electro-optic (CHARGE & FDTD/DGTD/FDE)