MeO-2PACz, or (2-(3,6-Dimethoxy-9H-carbazol-9-yl)ethyl)phosphonic acid (CAS 2377770-18-6), is a small self-assembled monolayer (SAM) molecule derived from 2PACz. It is supplied as an off-white powder or crystals with a purity above 98% (HPLC) and is used as a hole transport or hole extraction layer in NFA-polymer solar cells and p-i-n perovskite solar cells.
Its structure pairs an electron-rich dimethoxy carbazole core with an ethyl phosphonic acid anchor at the 9-position of the ring. The anchor binds to ITO or other metal oxides, so the molecule forms an interface between the electrode and the photoactive layer. Placing a nickel oxide (NiO) interlayer between ITO and MeO-2PACz improves coverage and uniformity of the monolayer and gives devices higher shunt resistance.
As a hole-selective contact, MeO-2PACz offers an alternative to PEDOT:PSS and can be deposited from solution at low concentrations such as 1 mM. It has been reported as a substrate that stabilises black-phase FAPbI3, with inverted perovskite cells reaching a PCE of 22.13% and retaining 92% of initial efficiency after 800 h ageing in ambient conditions. Available in 500 mg and 1 g packs.
- Hole transport or hole extraction layer in p-i-n (inverted) perovskite solar cells.
- Hole-selective interlayer in NFA-polymer and other organic solar cells.
- Interface modification of ITO and other metal oxide electrodes.
- Stabilisation of black-phase FAPbI3 in inverted perovskite devices.
- Solution-processed alternative to PEDOT:PSS hole contacts.
| Brand | Ossila |
|---|---|
| CAS number | 2377770-18-6 |
| Molecular formula | C16H18NO5P |
| Purity | > 98% (HPLC) |
| Category | — |
| Pack sizes | 500 mg, 1 g |
| Physical form | Off-white powder/crystals |
| Storage | — |
- Product code: M2427A1
- Molecular Weight: 335.29 g/mol
- Melting Point: Tm = 171 °C
- Absorption: λmax 465 nm (ITO)
- HOMO/LUMO: HOMO = 5.30 eV, LUMO = 2.12 eV
- Synonyms: (2-(3,6-Dimethoxy-9H-carbazol-9-yl)ethyl)phosphonic acid
- Typical Solvents: IPA, DMF, ethanol, THF
- Typical Concentration: 1 mM (0.335 mg/ml) or 1.0 mg/ml
A typical film is made by spin-coating 40 uL of a 1 mM (0.335 mg/ml) or 1.0 mg/ml solution at 3000 rpm for 50 s, annealing at 100 ℃ for 10 min, rinsing with IPA by spin-coating, then annealing again at 100 ℃ for 5 min. Common solvents are IPA, DMF, ethanol and THF; anhydrous solvents are used for solution preparation. Refer to the MSDS for safety information.
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