A Novel Method for Analyzing the Noise Characteristic of Solar Cells with E_n-I_n Model

In this paper, a novel method for analyzing the noise characteristic of solar cells with E_n-I_n model was studied. The E_n-I_n noise model in two-port network was introduced to study the low-frequency noise characteristic of solar cells. According to the relationship between the output noise power spectrum and the two noise parameters in E_n-I_n noise model of the solar cell, known as E_n and I_n, an accurate method for extracting the two noise parameters was proposed. At the same time, the measurement method for the both parameters from 1Hz to 10kHz was studied. After 1/f noise curve fitting and characteristic frequency of G-R noise extraction on the noise spectrums of a large amount of solar cells, the analyzing results of spectrum compositions proved the validity and significance of the E_n-I_n noise model for noise analysis of solar cells. It also provided the essential theoretical and experimental basis for the further research on noise characteristic and reliability estimation of solar cells and PV modules.