Crosslight would like to announce an update to our current official release (v2025). In addition to multiple bug fixes, the following improvements were made:

• A new optional module that implements a small-signal Photon-Photon resonance model for edge-emitting DFB/DBR lasers.
• A new model for single-photon avalanche photodetectors.
• A new method of transient simulation, using relative time periods for each individual scan command.
  This is helpful when dealing with intervals that vary significantly between scans.
• A new decoupled split-step thermal model, which can help with convergence at the cost of a small loss of self-consistency.
• A revised exciton model.
• A new mesh generator interface and improved regridding methods.
• A triplet-triplet fusion model for OLEDs.
• Improved PCSEL models to compute the coupling coefficients of a unit cell.
• An optional speed-up to microcavity simulations, by limiting printing of diagnostic data.

Customers with an up-to-date maintenance contract will be issued this update in the next few days.

An initial version of a photon-photon resonance model for PICS3D has been implemented in the 2026beta version. This is a late addition that will not be included in our upcoming 2025 stable release but is available for testing by interested customers with an active maintenance contract.

A new presentation on CCD simulation using Crosslight APSYS has been uploaded.

An update to our PCSEL models has been released for the 2025 beta version of PICS3D. This update allows for the calculation of the coupling coefficients using either a 3D unit cell or a simplified 2D index profile generated from the 3D unit cell. This information can be used for a full device simulation using existing sliver models.

Interested users should contact Crosslight for a demo.

Crosslight Software is proud to celebrate its 30th anniversary.

Crosslight is pleased to announce the successful implementation of a feature allowing users to import or impose any temperature distribution before or during the electrical simulation. This feature is useful because sometimes temperature profile can be obtained experimentally or from a different thermal simulator and some TCAD users may wish to avoid the complication of a full self-consistent thermal-electrical simulation. With a known temperature profile, electrical and optical simulation can be made much easier.

Users of Crosslight with such a need can contact Crosslight for v25 beta.

Crosslight is pleased to announce the successful implementation of an improved algorithm to perform simulations that include self-heating. In compound semiconductor, many material parameters are sensitive to temperature and such temperature sensitivity causes simulation to diverge from time to time in the default method where there is strong coupling between electrical and thermal equations.

To avoid the possible frustration caused by divergence due to thermal coupling, it is desirable to have the option of
decoupling the thermal and electrical simulations without too much of a loss in accuracy. As shown in this example, the split step causes some minor noise in the simulation IV/LI curves without altering the general behavior.

Users affected by thermal divergence problems are encouranged to contact Crosslight for the 2025 beta version.

We are proud to announce the fifth annual winner of a collaboration with Assistant Professor Can Bayram of the University of Illinois at Urbana-Champaign. As part of this collaboration, students worked with Crosslight TCAD tools in an academic setting and the best projects were selected for a prize.

Congratulations to the 2025 winner of this award:

• Rithwik Rayani, Implantable Biocompatible Micro–LEDs for Multifunctional Optogenetic Neural Control and Brain Mapping

With the popularity of quantum well electro-absorption modulators (EAM) in photonic systems, we see increased interest and demand for MQW EAM TCAD simulations.
Crosslight MQW EAM TCAD offers advanced simulation capability based on physical models for free carrier, many-body, and exciton effects.
Exciton simulation is the most efficient approach and its results are close to the experimental absorption values.

With version 2025 of Crosslight TCAD, modeling of quantum well EAM will have more accurate models of the behavior of such systems.
The new models include a temperature-dependent scattering time as well as a temperature-dependent ratio between the bound exciton and
its free-carrier counterpart.

The new models are based on the following reference: “Thermodynamics of excitons in semiconductors,” James P. Wolfe, Phys. Today 35(3), 46 (1982); doi:10.1063/1.2914968

Customers of Crosslight TCAD simulating quantum EAM are invited to evaluate the latest versions.

Crosslight would like to announce an update to our current official release (v2024). In addition to multiple bug fixes, the following improvements were made:

• New regrid algorithms to improve smoothness of new mesh
• Updated change of variable method in the non-linear Newton solver for the Drift-Diffusion equations
• Improved support for large output files when simulating structures with many mesh points

Customers with an up-to-date maintenance contract may contact their local sales representatives to access this update.