Cell Metallic Contact Resistance of Field-Retrieved PV Modules

Fang Li, Abhijit Gopakumar, Viswa Sai Pavan Buddha, Eric J. Schneller, Nafis Iqbal, Kristopher O. Davis, Govinda Samy Tamizhmani

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations


It is well known that the series resistance of photovoltaic (PV) modules increases over time in the field. Depending on the stress level and duration of local field/climatic conditions (e.g., temperature, humidity), the extent of series resistance increase can vary. To reduce the overall increase of the series resistance, it is crucial to determine and understand the extent of resistance increase in the individual components (i.e., cell metallization and interconnect solder bonds) of the field exposed modules. The cell metallization resistance is caused by both line resistance of the gridlines and the contact resistance between gridlines and semiconductor. This paper analyzes the increase of gridline resistance and contact resistance of the cells in the PV modules of same construction/type retrieved from two different high stress level climatic conditions, hot-dry (Arizona) and hot-humid (Florida). To correlate the contact resistance data with other studies, both retrieved-modules and extracted-cells have been characterized by current-voltage, UV fluorescence, reflected light microscopy and X-ray photoelectron spectroscopy measurements.

Original languageEnglish (US)
Title of host publication2020 47th IEEE Photovoltaic Specialists Conference, PVSC 2020
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages6
ISBN (Electronic)9781728161150
StatePublished - Jun 14 2020
Event47th IEEE Photovoltaic Specialists Conference, PVSC 2020 - Calgary, Canada
Duration: Jun 15 2020Aug 21 2020

Publication series

NameConference Record of the IEEE Photovoltaic Specialists Conference
ISSN (Print)0160-8371


Conference47th IEEE Photovoltaic Specialists Conference, PVSC 2020


  • contact resistance
  • encapsulant browning
  • moisture
  • series resistance

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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