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Metal-interconnected multijunction solar cells offer one pathway toward efficiencies in excess of 50%. However, if a 3- or 4-terminal configuration is used, optical losses from the interfacial grid can be considerable. Here, we examine an alternative which provides an optimal interconnection for two-terminal bonded devices. This “pillar-array” topology is optimized by minimizing the sum of all power...
To examine the limitations of one-dimensional (1D) solar cell modeling, 3D SPICE-based modeling is used to examine in detail the validity of the 1D assumptions as a function of sheet resistance for a model cell. The internal voltages and current densities produced by this modeling give additional insight into the differences between the 1D and 3D models.
A novel approach has been developed to enable the creation of a fully lattice-matched two-terminal four-junction III–V solar cell is which an upper 1.85 eV GaInP/ 1.42 eV GaAs two-junction (2J) tandem cell is bonded to a lower Eg3 eV GaInAsP/ 0.74 GaInAs eV 2J tandem cell. In this configuration, the upper tandem is grown inverted and lattice-matched to a GaAs substrate, and the lower tandem is grown...
We demonstrate high efficiency performance in two ultra-thin, Ge-free III–V semiconductor triple-junction solar cell device designs grown in an inverted configuration. Low-stress metamorphic junctions were engineered to achieve excellent photovoltaic performance with less than 3 × 106 cm−2 threading dislocations. The first design with band gaps of 1.83/1.40/1.00 eV, containing a single metamorphic...
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