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The simulation of the quantum efficiency and the I-V curves at several concentrations of a high efficiency concentrator dual-junction solar cell is presented using three different approaches: 1) analytic simulation with the one-diode model; 2) analytic simulation with distributed circuit models; and, 3) numerical simulation. The main advantages and limitations of each model are discussed and their...
In this paper, the benefits of the ultra high concentration (?? 1000 suns) are shown in terms of cost reduction and efficiency increase. Accordingly, the strategy followed at IES-UPM for more than 15 years is the development of III-V solar cells suitable for operation at 1000 suns or more. Recently, we have developed and manufactured a GaInP/GaAs dual-junction cell which results in an efficiency (measured...
In this paper we intend to expand the portfolio of non-destructive techniques available for the individual characterization of the subcells in a monolithic multijunction stack. The goal is to explore the use of low-temperature, variable frequency, capacitance-based techniques to extract information of the minority carrier parameters, presence of traps and electronic defects in each subcell in the...
In this paper we characterize the first functional, lattice matched, GaInP/GaInAs/Ge triple junction solar cells grown and manufactured in our lab with an efficiency conversion of 31.5% at a concentration level of 1000 suns. This is our first approach for transferring the world record double junction solar cell, also developed in our group, into a Ge substrate. First experimental results are presented...
This paper studies the chemical composition of the hetereointerface of the semiconductors InGaP/GaAs, grown by Metal Organic Vapor Phase Epitaxy (MOVPE), by means of X-ray Photoelectrons Spectroscopy (XPS) by two methods: conventional XPS with Ar+ sputtering and by angle resolved XPS (ARXPS). Firstly, from the corrected Auger parameter for different angles, we have determined the depth of the Ga oxide...
This work presents some lines of research currently being investigated in our group that are aimed to contribute to a better performance of multi-junction solar cells at very high concentrations (~1000 suns) and, in addition, to achieve a better characterization of these devices also at high concentrations. The improvement of the performance of the solar cell at high concentrations is addressed in...
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