Comparison of the Temperature Coefficients of the Basic I-V Parameters for Various Types of Solar Cells
Abstract
It is well-known that the maximum power output of photovoltaic devices changes with temperature. Therefore, the temperature coefficients of the basic device performance parameters (open-circuit voltage, short-circuit current, fill factor, and efficiency) are important factors which must be taken into account in the design of a photovoltaic power system, where temperature changes occur throughout the day and year. This paper reports results of experimental temperature coefficient measurements obtained on a wide variety of different photovoltaic devices, many of which have not had temperature coefficient data published previously*
Introduction
It is well-known that photovoltaic device performance, and therefore solar cell maximum power output, changes with temperature. Hence, it is important to take into account the temperature coefficients of the basic device I-V parameters (open-circuit voltage, short-circuit current, fill factor, and efficiency or maximum power point) when designing photovoltaic power systems for actual outdoor applications, where temperature changes occur throughout the day and year. In the past, however, very little temperature coefficient data for devices other than crystalline silicon or GaAs has been published. The objective of this work is to present a comparison of temperature coefficient data for a variety of different solar cell types, several of which have not been previously published. The data is experimentally obtained and is tabulated in both actual parameter units (mV, mA, mW) per degree Celcius, as well as parts-per-million per degree Celcius to enable comparison of the different photovoltaic devices.
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