An Official Journal of the American Society of Thermal and Fluids Engineers

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SPECTRAL RESPONSE OF LARGE AREA AMORPHOUS SILICON SOLAR CELLS

ABSTRACT

In this work we report the study of spectral response on large area amorphous silicon solar cells (30×40 cm²), deposited through plasma enhanced chemical vapour deposition technique (PECVD) at excitation frequencies of 27.12 MHz. To perform this work, the solar cells were split in units of area of 0.126 cm², which allows determining the device homogeneity over all the entire solar cell. Emphasis of this work is put the role of thickness and optical band gap of p-doped layer on the collection efficiency, spectral response, current density-voltage curves under standard condition and spectroscopy impedance. The results show that high transparent p-doped layer can be deposited at 42mW/cm², which allows increasing the collection efficiency in 45%, at the blue region. The spectroscopy impedance performed showed to be efficient in analyzing the device shunt resistance, interfaces role on the device performances and the behaviour of the device depletion region, for the range of frequencies analysed.