Few‐Layer MoS₂ Flakes as Active Buffer Layer for Stable Perovskite Solar Cells

Abstract

Solution-processed few-layer MoS 2 fl akes are exploited as an active buffer layer in hybrid lead-halide perovskite solar cells (PSCs). Glass/FTO/compact-TiO 2 /mesoporous-TiO 2 /CH 3 NH 3 PbI 3 /MoS 2 /Spiro-OMeTAD/Au solar cells are realized with the MoS 2 fl akes having a twofold function, acting both as a protective layer, by preventing the formation of shunt contacts between the perovskite and the Au electrode, and as a hole transport layer from the perovskite to the Spiro-OMeTAD. As prepared PSC demonstrates a power conversion effi ciency ( η ) of 13.3%, along with a higher lifetime stability over 550 h with respect to reference PSC without MoS 2 (Δ η / η = −7% vs. Δ η / η = −34%). Large-area PSCs (1.05 cm 2 active area) are also fabricated to demonstrate the scalability of this approach, achieving η of 11.5%. Our results pave the way toward the implementation of MoS 2 as a material able to boost the shelf life of large-area perovskite solar cells in view of their commercialization.

Solution‐Processed MoS2/Organolead Trihalide Perovskite Photodetectors

“…[32] To understand how photogenerated carriers are transferred from the perovskites into MoS 2 , we consider the energy band align ment of the different layers. It has recently been shown that MoS 2 can be used as a hole transport layer in perovskite solar cells.…”

Graphene–Perovskite Solar Cells Exceed 18 % Efficiency: A Stability Study

“…[101][102][103][104][105] Because the GO insertiond id not resulti nh ole-injection improvement from the perovskite to spiro-OMeTAD, we attributed the fast V OC rise time to improved perovskite regenerationd ynamics induced by the HTM. [101][102][103][104][105] Because the GO insertiond id not resulti nh ole-injection improvement from the perovskite to spiro-OMeTAD, we attributed the fast V OC rise time to improved perovskite regenerationd ynamics induced by the HTM.…”

Enhanced Lifetime and Photostability with Low‐Temperature Mesoporous ZnTiO3/Compact SnO2Electrodes in Perovskite Solar Cells

“…What's more, mesoporous structure provides protection for perovskite from water and oxygen in air, greatly improving the stability and lifetime of devices . In fact, it has recently been demonstrated that the interface between the perovskite and the transport layer can significantly affect the charge recombination process and material stability within the working device . The infiltration of perovskite into mesoporous layer enlarges charge separation region at the perovskite/ETL interface, allowing rapid electron‐injection into ETL from the active layer, then resulting in slower degradation of perovskite and non‐radiative recombination reduction .…”