Electrical engineering

Energy conversion efficiency

Gallium arsenide

Engineering

Wafer

Materials science

Triple junction

Wafer bonding

Terminal (telecommunication)

Computer science

Photovoltaic system

Solar cell

Silicon

Optoelectronics

Telecommunications

Solar RRL

The terrestrial photovoltaic market is dominated by single‐junction silicon solar cell technology. However, there is a fundamental efficiency limit at 29.4%. This is overcome by multijunction devices. Recently, a GaInP/GaAs//Si wafer‐bonded triple‐junction two‐terminal device is presented with a 33.3% (AM1.5g) efficiency. Herein, it is analyzed how this device is improved to reach a conversion efficiency of 34.1%. By improving the current matching, an efficiency of 35% (two terminals, AM1.5g) is expected.

Two‐Terminal Direct Wafer‐Bonded GaInP/AlGaAs//Si Triple‐Junction Solar Cell with AM1.5g Efficiency of 34.1%