An analytical solution for diffusion equation in semiconductor devices has been presented. The complete solution has been found in terms of following processes: Drift, Diffusion, Generation, Recombination and Carrier Trapping, using Maple. Legal Notice: The copyright for this application is owned by the author. Neither Maplesoft nor the author are responsible for any errors contained within and are not liable for any damages resulting from the use of this material. This application is intended for non-commercial, non-profit use only. Contact the author for permission if you wish to use this application in for-profit activities.