Publication date: 4th October 2024
In recent years, in the field of inverted (p-i-n) perovskite solar cells (PSCs), The use of self-assembled monolayers (SAM) in a hole transport layer (HTL) has been correcting a great interest. It's mainly due to the fact that they can achieve high HTL coverage with very thin film thickness and high power conversion efficiency (PCE). However, due to its hydrophobicity, the reduction in perovskite layer coverage on SAM is a common issue. To address this, we can add SAM material into the perovskite precursor solution and form both p-i layers simultaneously.
This investigation explores the morphology and the physical properties of perovskite thin films produced using the one-step formation of p-i layers without anti-solvent, with the recently developed multipodal molecule [[5H-diinolo[3,2-a:3',2'-c]carbazole-5,10,15-triyl]tris(propane-3,1-diyl)] trisphosphonic acid (3PATAT-C3), which exhibits a face-on molecular orientation1. The results showed that introducing 3PATAT-C3 into the perovskite precursor solution yielded passivation improvements and surface roughness reductions.
The PSCs utilizing the one-step p-i deposition exhibited a remarkable PCE and fill factor, outperforming the reference devices fabricated by depositing perovskite on pre-deposited SAM. This means we can make superior PSCs with less time and fewer processes using the one-step method. These outcomes suggest that the one-step p-i deposition technique matches and potentially surpasses the performance of traditionally manufactured cells.
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