A Charge Transfer Model for CMOS Image Sensors

L. Han, Suying Yao, AJP Theuwissen

Research output: Contribution to journalArticleScientificpeer-review

22 Citations (Scopus)


Based on the thermionic emission theory, a charge transfer model has been developed which describes the charge transfer process between a pinned photodiode and floating diffusion (FD) node for CMOS image sensors. To simulate the model, an iterative method is used. The model shows that the charge transfer time, barrier height, and reset voltage of the FD node affect the charge transfer process. The corresponding measurement results obtained from two different test chips are presented in this paper. The model also predicts that other physical parameters, such as the capacitance of the FD node and the area of the photodiode, will affect the charge transfer. Furthermore, the model can be extended to explain the pinning voltage measurement method and the feedforward effect.
Original languageEnglish
Pages (from-to)32-41
Number of pages10
JournalIEEE Transactions on Electron Devices
Issue number1
Publication statusPublished - 28 Jul 2016


  • thermionic emission theory
  • CMOS image sensors (CISs)
  • pinned photodiode (PPD)


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