Development of low-cost, high-performance solar cell technology using plasmonic
Subject Areas : The Application of Chemistry in Environment
1 - Department of Physics, Naragh Branch, Islamic Azad University, Naragh, Iran
Keywords: solar cells, plasmonic, crystal, nanoparticles, GaAs,
Abstract :
III-V compound multijunction solar cells enable ultra-high efficiency performance in designs where sub-cells with high material quality and high internal quantum efficiency can be used. However, the optimal multijunction cell bandgap sequence cannot be achieved using lattice-matched compound semiconductor materials. Most of the current approaches to compound semiconductor solar cell design are focused on lattice-matched designs or transformation growth, which inevitably leads to less design flexibility or suboptimal material quality. An alternative approach is to employ direct junctions between subcells of a multi-junction cell, which by constraining the network, the defect required to accommodate the network mismatch to the tunnel junction interfaces, enables displacement-free active regions. For a direct-coupled multi-junction solar cell, a GaAs/InGaAs monolithic cell with a metal-free n+GaAs/n+InP tunnel junction with a highly conductive ohmic contact is suitable for solar cell applications that overcome the 4% grid mismatch.slow The quantum efficiency spectra for the grafted cell were quite similar to each of the ungrafted GaAs and InGaAs subcells. The open-circuit voltage of the double-band bonded cell was equal to the sum of the open-circuit voltages of the non-bonded subcell, indicating that the bonding process does not reduce the quality of the cell material because any crystal defects created that act as recombination centers cause a voltage drop. Also, the junction interface does not have a significant carrier recombination rate to reduce the open circuit voltage.
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