MeO-4PACz, or (4-(3,6-Dimethoxy-9H-carbazol-9-yl)butyl)phosphonic acid (CAS 2922526-56-3), is a self-assembled monolayer (SAM) material used as a hole transport or hole extraction layer in p-i-n perovskite solar cells and NFA-polymer organic solar cells. It is supplied as a white powder with a purity of > 98% (HPLC).
The molecule combines an electron-rich, hydrophobic 3,6-dimethoxy-9H-carbazole head, a butyl spacer and a phosphonic acid group that anchors it to the electrode. Compared with Me-4PACz, the added methoxy groups are intended to improve wetting of the SAM on the electrode and make deposition of the perovskite layer more reproducible. The longer spacer also lets small molecules such as (aminomethyl)phosphonic acid (AMP) reach the buried interface and fill gaps in the monolayer.
MeO-4PACz can replace PEDOT:PSS as a hole-selective contact and is deposited from solution at low concentration, around 1 mM. In combination with further surface treatment of the perovskite, inverted MA-free perovskite cells reached a PCE of 25.35% (certified: 24.87%) and kept 92.8% of initial efficiency after 1000 h of maximum power point tracking. The material is licensed by Helmholtz-Zentrum Berlin and Kaunas University of Technology.
- Hole-selective self-assembled monolayer in inverted (p-i-n) perovskite solar cells.
- Hole transport or extraction layer in NFA-polymer organic solar cells.
- Solution-processed alternative to PEDOT:PSS as a hole contact.
- Research on buried-interface passivation of perovskite devices, for example with AMP co-anchoring.
| Brand | Ossila |
|---|---|
| CAS number | 2922526-56-3 |
| Molecular formula | C18H22NO5P |
| Purity | > 98% (HPLC) |
| Category | — |
| Pack sizes | 500 mg, 1 g, 5 g |
| Physical form | White powder |
| Storage | — |
- Product code: M2453A1
- Molecular Weight: 363.34 g/mol
- HOMO/LUMO: HOMO = 5.32 eV, LUMO = 2.05 eV
- Melting Point: 197 °C
- Synonyms: (4-(3,6-Dimethoxy-9H-carbazol-9-yl)butyl)phosphonic acid, MeO4PACz
- Typical Concentration: 1 mM (0.363 mg/mL) - 1.0 mg/ml
Typically dissolved in anhydrous ethanol, with methanol, IPA or IPA/DMF also suitable, at 1 mM (0.363 mg/mL) to 1.0 mg/ml. A typical procedure spin-coats 40 uL of solution at 5000 rpm for 30 s, anneals for 10 min at 100 ℃ and rinses with IPA to remove excess molecules. Consult the MSDS before handling.
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