Fabrication of CdTe solar cell using an Inx(OOH,S)y/CdS double layer as a heterojunction counterpart

An Inx(OOH,S)y/CdS double layer was utilized as a heterojunction counterpart in CdTe solar cells to enhance the transmission of light through the window layer. An Inx(OOH,S)y/CdS double layer was deposited by chemical bath deposition onto an ITO-coated Corning glass substrate in varying thickness combinations. Inx(OOH,S)y is porous, and the interface between the Inx(OOH,S)y and CdS layers overlaps to a large extent. The Inx(OOH,S)y/CdS double layer showed a higher optical transmittance in the 500–600 nm wavelength range compared to the CdS layer. However, the efficiency of Inx(OOH,S)y/CdS/CdTe solar cells was not improved due to the lower open circuit voltage. It is considered that the Inx(OOH,S)y/CdS window layer is less n-type, which is most likely due to the mixing of the two layer during CdTe deposition at 575 °C.