Enhanced Stability and Performance Lead Halide Perovskite Solar Cells via Hole Transport Materials Additive Strategies

Past few years has witnessed a rapid surge in the design and fabrication of lead halide perovskite solar cells (LH-PSCs). Methyl ammonium lead iodide (CH₃NH₃PbI₃) is one of the widely used visible light absorbing material towards the fabrication of LH-PSCs. The CH₃NH₃PbI₃ has a band gap of around 1.55 eV which makes it a suitable visible light sensitizer for the development of high performance next generation LH-PSCs. In this work, CH₃NH₃PbI₃ has been explored as visible light absorbing layer with mesoscopic device architecture of (FTO/TiO₂/CH₃NH₃PbI₃/spiro-OMeTAD+MoS₂/Au) LH-PSCs. MoS₂ has been utilized as hole transport material additive which not only acted as additive but also enhanced the performance of the LH-PSCs with long term stability. The FTO/TiO₂/CH₃NH₃PbI₃/spiro-OMeTAD+MoS₂/Au showed the interesting efficiency of 14.2 % which is higher than that of the FTO/TiO₂/CH₃NH₃PbI₃/spiro-OMeTAD/Au device (11.9 %). This work offers the fabrication of stable and improved LH-PSCs with device architecture of FTO/TiO₂/CH₃NH₃PbI₃/spiro-OMeTAD+MoS₂/Au.