Abstract
The ac recombination velocity of the excess minority carriers, in the back surface of a silicon solar cell with a vertical junction connected in series, is developed through Einstein’s law giving the diffusion coefficient of minority carriers according to temperature, through mobility. The frequency spectrum of both, amplitude and phase, are produced for the diffusion coefficient and the recombination velocity in the rear face, in order to identify the parameters of equivalent electric models.
Highlights
Open AccessVertical multi-junctions (VMJ) silicon solar cells have an architecture that is an alternative for collecting minority carriers with low-diffusion length [1] [2] [3] [4] [5].Two types of VMJ solar cells are developed, by a succession of npp or pnn junctions
The ac recombination velocity of the excess minority carriers, in the back surface of a silicon solar cell with a vertical junction connected in series, is developed through Einstein’s law giving the diffusion coefficient of minority carriers according to temperature, through mobility
The frequency spectrum of both, amplitude and phase, are produced for the diffusion coefficient and the recombination velocity in the rear face, in order to identify the parameters of equivalent electric models
Summary
Vertical multi-junctions (VMJ) silicon solar cells have an architecture that is an alternative for collecting minority carriers with low-diffusion length [1] [2] [3]. Two types of VMJ solar cells are developed, by a succession of npp or pnn junctions. A base type (p) is surrounded by two emitters allowing the collection of minority carriers at close range, leading to the increase. The VMJ-S, presents a succession of npp+ or pnn+ solar cells, connected in series, allowing increasing the electrical voltage [9]. The VMJ is designed to operate under light concentration to generate more minority carriers, thereby increasing voltage or current production. In this situation, temperature is an important factor that influences the operating performance of the solar cell, through the physical mechanisms that are important to study [10]. The ac recombination velocity in the rear face (p/p+) of the solar cell, is determined and studied in temperature using the frequency spectrum of its amplitude and phase
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