32.9% efficient tandem solar cell with strain-balanced GaInAs/GaAsP quantum wells

We demonstrate single and dual junction solar cells with up to 80 strain-balanced GaInAs/GaAsP quantum wells (QWs), in order to extend the range of photon absorption. The net average stress in the quantum well layers is <= 12 MPa, despite coherent stresses in the individual layers that are 35-70 times greater. The GaAs-QW cell has a certified efficiency of (27.2 +/- 0.2)% at one-sun; the GaInP/GaAs-QW tandem has a certified record one-sun efficiency of (32.9 +/- 0.5)%. We will discuss the architecture of the devices, the physics behind the high performance, and pathways to further improvement.

Automated summary

The study demonstrates single and dual junction solar cells with multiple quantum wells to extend photon absorption range and achieve high efficiency. The research discusses device architecture, performance principles, and pathways for further improvement.