PVRD-FASP: A Unified Solver for Modeling Carrier and Defect Transport in Photovoltaic Devices

Abdul R. Shaik, Daniel Brinkman, Igor Sankin, Christian Ringhofer, Dmitry Krasikov, Hao Kang, Bedrich Benes, Dragica Vasileska

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


In this article, we present a simulator for modeling transport of charge carriers and electrically active defect centers in solar cells by treating them on an equal footing, which allows us to address metastability and reliability issues. The exact nonlinear differential equations set solved by our solver is presented. The formulation of such differential equations, namely the continuity equations, drift-diffusion equation, and Poisson equation, for studying charge and defect transport is explained. The parameters needed for forming the differential equations are taken from first principle calculations. The solver is verified with test cases built on PN heterojunctions, Cu diffusion in single crystal CdTe and comparing Silvaco simulations with our numerical results.

Original languageEnglish (US)
Article number8826615
Pages (from-to)1602-1613
Number of pages12
JournalIEEE Journal of Photovoltaics
Issue number6
StatePublished - Nov 2019


  • Defect chemical reactions
  • PN heterojunction
  • drift-diffusion-reaction solver
  • implicit Euler with Newton iteration
  • transient solutions for continuity equation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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