Abstract
The aim of this work is to study the electrical behavior of a vertical parallel junction silicon solar cell by mean of impedance spectroscopy. By solving diffusion-recombination equation, the excess minority carrier density expression was established and the photocurrent and the photo voltage were deduced. We plotted Nyquist diagram of the solar cell impedance and gave corresponding electrical circuits. We then introduced impedance spectroscopy method to access for the first time to some electrical parameters of a vertical junction solar cell (series resistance, parallel resistance, capacitance and inductance).
Highlights
The increasing demand for clean energy and the largely untapped potential of the sun as an energy source is making solar energy conversion technology increasingly important
We will lay stress on the impedance spectroscopy (Scofield, 1995; Chenvidhya et al, 2005) as a tool for vertical junction electrical characterization; to the best of our knowledge, this is the first time impedance spectroscopy is applied to a vertical junction solar cell
For the negative one (Fig. 2a) the parallel vertical junction behaves inductively contrary to the curve in Fig. 3a where capacitance phenomenon predominates. From these two behavior the vertical junction solar cell can be represented by one of the electrical circuit presented on Fig. 2b and 3b:
Summary
The increasing demand for clean energy and the largely untapped potential of the sun as an energy source is making solar energy conversion technology increasingly important. The demand for solar cells, which convert sunlight directly into electricity, is growing. A variety of measurements are used to characterize a solar cell’s performance (Green, 2008; Dieng et al, 2011; Kumar et al, 2001). We will lay stress on the impedance spectroscopy (Scofield, 1995; Chenvidhya et al, 2005) as a tool for vertical junction electrical characterization; to the best of our knowledge, this is the first time impedance spectroscopy is applied to a vertical junction solar cell. The vertical junction solar cell impedance is deduced. By help of Nyquist diagram, electrical circuits of the vertical junction are proposed and from impedance spectroscopy theory, series resistance, parallel resistance, capacitance and inductance are extracted
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