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Research Papers

Influence of Temperature on Methods for Determining Silicon Solar Cell Series Resistance

[+] Author and Article Information
M. Sabry

Solar Research Department, PV Laboratory, National Research Institute of Astronomy and Geophysics, Helwan, Cairo 11420, Egyptm_sabry@nriag.sci.eg

Ahmed E. Ghitas

Solar Research Department, PV Laboratory, National Research Institute of Astronomy and Geophysics, Helwan, Cairo 11420, Egypt

J. Sol. Energy Eng 129(3), 331-335 (Jan 18, 2007) (5 pages) doi:10.1115/1.2735350 History: Received September 20, 2006; Revised January 18, 2007

Series resistance (Rs) is considered to be one of the most important parameters affecting solar cell performance, especially those operating under concentrated solar radiation. Many methods have been proposed where the estimated Rs values do not coincide or even come close to each other. In this paper, seven methods for determining Rs are reviewed and verified experimentally using a commercial single-crystal silicon solar cell (104cm2 of total area). Their differences lie principally in: (1) number of diodes quoted in the solar cell model; (2) other assumptions (constant ideality factor or not, infinite, or finite shunt resistance); and (3) simultaneous determination of other parameters or not. Based on these methods, Rs values were derived by extracting the necessary parameters from the measured IV characteristics of the cell at different illuminations and cell temperatures. According to these methods, the obtained Rs values varied greatly in comparison with each other as well as its trend with temperature variation.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

I–V characteristics of the solar cell under test at temperatures 10°C, 25°C, and 50°C on the left; and the extracted physical parameters of I–V curve at 25°C listed on the right

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Figure 2

Illustration of the calculations of the two-characteristic method

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Figure 3

Variation of Rs against cell temperature as calculated by the two characteristics method

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Figure 4

Behavior of Rs versus cell temperature according to the maximum power method

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Figure 5

Area method for determining Rs variation with cell temperature

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Figure 6

El-Adawi method for determining Rs at different cell temperatures

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Figure 7

Singh and Singh method for estimating Rs as a function of cell temperature

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Figure 8

Series resistance at different illuminations and temperatures as estimated from one diode method

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Figure 9

Series resistance at different illuminations and temperatures as estimated from two diode method

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