CuSCN as Hole Transport Material for Perovskite Solar Cells.

High efficiency perovskite solar cells are usually achieved with expensive hole transport materials (HTM), such as PTAA and Spiro-OMeTAD. To bring this technology to industry it is essential to find alternative HTM. In this work, we show results with the inexpensive inorganic semiconductor CuSCN as HTM in inverted device structure. We first studied the interaction between CuSCN and the perovskite solution by performing solubility test and found out that CuSCN can be dissolved in perovskite solution. Then devices were fabricated using single-step deposition technique and sequential deposition technique were first a PbI₂ layer is first deposited that could overcome the potential incompatibility of the perovskite solution with the CuSCN. Solar cells with V_oc > 1000 mV were successfully fabricated with the 2-step process but demonstrated lower efficiencies compared to the 1-step process due to a lower J_sc. [ABSTRACT FROM AUTHOR]