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Number 1953

Measuring Photovoltaic Cell I-V
Application Note Characteristics with the Model 2420
Series
SourceMeter Instrument
Introduction The series resistance (rs) represents the ohmic losses in the
front surface of the cell and the shunt resistance (rsh) represents
Photovoltaic (PV) cells convert sunlight directly to electricity.
the loss due to diode leakage currents. The conversion efficiency
Fabricated from a wide variety of materials using many different
(h) is defined as:
processing techniques, these devices are used for terrestrial
power generation, as well as commercial, military, and research Pm
h = ____
space power applications. PV cell characterization involves Pin
measuring the cell's electrical performance characteristics to
and the fill factor (FF) given by:
determine conversion efficiency and critical equivalent circuit
parameters. It is an important tool for R&D and production of ImVm
FF = ______
cells and photovoltaic arrays. This application note describes IscVoc
how to use the Keithley Model 2420 High Current SourceMeter