Zn3P2 as an improved semiconductor for photovoltaic solar cells

Two heterojunctions with Zn3P2 were developed into: Zn3P2/ZnSe and Zn3P2/(CdZn)S. In both cases, improved open-circuit voltages were achieved, however, control of the material properties of the heterojunction partner has limited short-circuit currents and overall efficiency. In the case of ZnSe, the high resistivities of deposited thin-films were efficiency-limiting on all devices. In (CdZn)S high interface recombination rates control the short-circuit current and limit the overall efficiency. A more fundamental study of the Zn3P2/(CdZn)S heterojunction is necessary to further optimize this device.