Publication date: 17th February 2025
In this work, we present our most recent work related to the enhancement of perovskite solar cells stability via the application of MXene transport layers. We have modified the halide perovskite abdorber, the transport layers and the device interfaces via several methods such as additive engineering and the application of novel electron and hole transport layers like MXenes. For example, we use the 2D Ti3C2 MXene in normal PSC configuration of the type: FTO / c-TiO2 / m-TiO2 / halide perovskite (HP) / MXene / Spiro-OMeTAD / Au. We enployed the quadruple halide perovskite (HP) Rb0CsMAFAPb(IxBry)3 and the DMA1-XMAXPbI3 as the absorbers. The MXene (Ti3C2-Tx) was employed as the interface of HP and the hole transport layer (HTL) to fabricate HP/MXene heterojunctions. Our champion solar cells resulted in PCE above 22 %. Both indoor stability studies under ISOS-L protocol (continuous MPP tracking under N2 atmosphere for 1000 h) and outdoor stability analyses under the ISOS-O protocol (MPP tracking, encapsulated devices) demonstrated the superior stability of PSCs when the MXene is employed. We also disclose the analysis of PSC stability via in-situ characterization where the effect of bias voltage, temperature or both is analyzed. Our results demonstrate the effect of strain in the crystal structure of halide perovskite sand its relation to stability.
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