Scientists at the United States Naval Research Laboratory (NRL) have jointly designed a solar cell with three junctions in the Department of Electronic Technology and Science with Imperial College London and MicroLink Devices. This battery has a 50% conversion efficiency The possibility of obstacles. This is the current goal of multi-junction photovoltaic development.
NRL's research physicist Robert Walters said: This research has completed a novel, realistically achievable, lattice-matched multi-junction solar cell design, and has the ability to break 50% of the electricity in concentrated lighting conditions. The possibility of conversion efficiency. "At present, the world record for the efficiency of three-junction solar cells under centralized lighting is 44%. The major breakthrough in technology is the need for solar cells to be more efficient. This is also generally accepted."
According to the scientists' explanation, the current challenge is to develop a semiconductor material system that allows it to achieve a wide range of energy band gaps while growing along with high hyalin characteristics.
By developing new semiconductor materials and applying energy band structure engineering on tension-balanced quantum wells, the NRL research team has designed multi-junction solar cells. The cell uses a lattice-matched material to an indium phosphide (InP) substrate that can directly reach the band gap from 0.7 to 1.8 electrons in the Ford band gap.
Walters said that “it is the key to breaking the current world record with a large range of bandgap lattice matching materials. It is well-known that the materials of InP lattice matching materials can achieve band gaps of 1.4 eV and below 1.4 eV, but it does not exist yet. Greater direct bandgap ternary alloy semiconductors."
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