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Self-Assembled Monolayer (SAM) Forming Agents for Enhancing Solar Cell Performance

Since the first report was published by Miyasaka et al.,1) perovskite solar cells have been drastically developed for 10 years. One of the main bottlenecks towards large-scale production is in the hole transport layer, though many researchers have challenged to stabilize and upscale perovskite solar cell for a practical use. Some conventional hole transport materials, Spiro-OMeTAD and PTAA, require expensive material cost and are destabilized due to a necessary dopant for a carrier transport.
Recently, Getautis, Albrecht et al. developed some hole selective self-assemble monolayer (SAM) forming agents, 2PACz [C3663], MeO-2PACz [D5798] and Me-4PACz [M3359], for high performance perovskite solar cell. 2PACz, MeO-2PACz and Me-4PACz can form a monolayer on a metal oxide surface anchored by the phosphonic acid moiety. These materials are useful for a tandem solar cell because it makes a conformal coverage on rough textures. A perovskite solar cell using the SAM hole transport layer can realize more than 20% efficiency without any dopants, and very cost effective because extremely low material consumption. Organic thin film solar cell (OPV) using 2PACz showed 18.03% power conversion efficiency that is better performance than those of using the existing PEDOT:PSS. Perovskite-Silicon tandem solar cell using Me-4PACz as a hole contact material realized 29.15% efficiency (Table 1).

C3663, D5798, M3359

Products

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Advantages

  • Enable efficient, versatile and stable solar cell devices without additives, interlayers or dopants
  • Self-assembly leads to conformal coverage of oxide surfaces (including textured)
  • Simple, scalable and extremely cost-effective processing

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Applications

Application 1

Stabilized power conversion efficiencies with self-assembled monolayer (SAM):

Application2

(CsMAFA = Cs0.05(MA0.17FA0.83)0.95Pb(I0.83Br0.17)3, MAFA = MA0.05 FA0.95Pb(I0.95Br0.05)3,
Cs = cesium, MA = methylammonium, FA = formamidinium, CIGSe = copper indium gallium selenide)

*These data are taken from References.1-6)

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Materials Processing

Method 1: Dip coating

suitable for large-area coating and textured substrates

Dip coating

Method 2: Spin coating

suitable for fast research & optimization

Spin coating

*The minimum needed dipping time can vary from minutes to hours. After some further testing with 2PACz, researchers found more reproducible results with rather 0.5 mmol/L and 5 min dipping. Note that optimal concentration and dipping time may vary depending on the used substrate oxide and pre-treatment.

  • The SAM forming agents can be processed within wide processing windows with higher reproducibility than current standard hole transport materials (like PTAA). The substrates (e.g. ITO) have to be clean and activated by, for example, UV-Ozone treatment.
  • The SAM forming agent powders were usually dissolved in ethanol or isopropanol (1 mmol/L ≈ 0.3 mg/mL), MeO-2PACz powder was stored in air, while 2PACz and Me-4PACz were stored in a N2-filled glovebox.

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References

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