MeO-4PACz (4-(3,6-Dimethoxy-9H-carbazol-9-yl)butyl)phosphonic acid, CAS No. 2922526-56-3) is a self-assemble monolayer (SAM) material. It bears 3,6-dimethoxy-9H-carbazole as the hydrophobic electron rich terminal, butyl chain as the spacer, and phosphonic acid as the anchor to the surface of the electrode. As an alternative to Me-4PACz, the introduction of the methoxy group is aimed to improve the wettability of the SAM on the surface of the electrode and mitigate the poor deposition reproducibility of the active perovskite layer.

The longer alkyl spacer allows small molecules such as (aminomethyl)phosphonic acid (AMP) to sink and anchor to the buried interface to fill the voids of the self-assembled monolayer. With the help of further sequential modification of perovskite active layer surface by 2-(3-fluorophenyl)ethylamine iodide (mF-PEAI) and piperazine diiodide (PDI), uniform surface potential can be achieved, and recombination losses at the interface are thus minimized. Inverted MA-free perovskite solar cells achieved power conversion efficiency (PCE) of 25.35% (certified: 24.87%) and maintained 92.8% of the initial efficiency after 1000 h of maximum power output tracking.

Serving as hole selective contact for organic solar cells and perovskite solar cells, MeO-4PACz is an alternative to PEDOT:PSS with superior performance with the convenience of solution deposition at low concentration, i.e. 1 mM.

Solution Processing Procedure

Typical processing solvents: Anhydrous ethanol (methanol, IPA, IPA/DMF are also superior solvents)
Typical concentration: 1 mM (0.363 mg/mL) - 1.0 mg/ml
Typical processing procedure: 40 uL of MeO-4PACz solution (0.363 mg in 1 ml IPA) is deposited onto the centre of the substrate surface and spin-coated for 30 s at the speed of 5000 rpm then annealed for 10 min at 100 ℃. The substrate is further washed by IPA to remove residual self-assembly molecules (DOI: 10.1002/aenm.202304486)

General Information

Product Details

Chemical Structure