Abstract
Carrier‐selective contacts offer promising opportunities for solar cells. By alleviating the need for p–n junctions and acting as passivation layers, they significantly simplify the device design and fabrication. Herein, this strategy is applied to a narrow‐bandgap (≈0.91 eV) InGaAsP solar cell. Such a solar cell, lattice‐matched to InP, possesses a bandgap ideal for the bottom subcell of a tandem cell. It is shown that TiO2 forms an electron‐selective contact to InGaAsP. The TiO2/InGaAsP solar cell exhibits a short‐circuit current density of 35.2 mA cm−2, an open‐circuit voltage of 0.49 V, and an efficiency of 8.9%. The cell J–V characteristics and quantum efficiency highlight the beneficial aspect of TiO2 as a passivating layer for InGaAsP. The reduced open‐circuit voltage and lower response at longer wavelengths, on the other hand, indicate that the quaternary alloy material quality could be further improved to increase the carrier diffusion length. Nevertheless, the performance of this simplified electron‐selective contact solar cell structure is comparable to conventional p–n junction 1 eV InGaAsP solar cells reported in the literature, highlighting the promise toward lower‐cost photovoltaic tandem cells.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
More From: physica status solidi (RRL) – Rapid Research Letters
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.