High Throughput Roll to Roll Fabrication of Perovskite Solar Cells via Slot Die Coating

Rahul Patidar^a, Daniel Burkitt^a, Peter Greenwood^a, Katherine Hooper^a, Stoichkov Dimitrov^a, Matteo Colombo^a, James McGettrick^a, Vasil Stoichkov^a, David Richards^a, David Beynon^a, Matthew Davies^a, Trystan Watson^a

^aSPECIFIC – Swansea University, Materials Research Centre, College of Engineering, UK, Bay Campus, Swansea, SA1 8EN,, SWANSEA, United Kingdom

International Conference on Hybrid and Organic Photovoltaics
Proceedings of Online International Conference on Hybrid and Organic Photovoltaics (OnlineHOPV20)

Online, Spain, 2020 May 26th - 29th

Organizers: Tracey Clarke, James Durrant, Annamaria Petrozza and Trystan Watson

Poster, Rahul Patidar, 071
Publication date: 22nd May 2020

ePoster:

The ability of metal halide perovskites to be processed via solution opens a window for high through-put manufacturing of perovskite solar cells(PSCs). High efficiency PSCs can be processed entirely from solution and onto flexible substrates. This makes them ideal for manufacturing using high volume roll-to-roll (R2R) techniques. Common R2R compatible techniques such as rotary screen printing, inkjet printing, spray coating, slot die coating, gravure printing and blade coating have been demonstrated for the fabrication of PSCs¹. Among these, gravure and slot die coatings are the only reported methods for R2R manufacturing of PSCs.

Slot die coating is of special interest for PSCs given its capability to coat a wide range of ink rheologies and as a pre-metered technique provides lower material usage, reducing the fabrication cost.

However, with high throughput coating processes, usage of low permissible exposure limit (PEL) solvents like Dimethyl formamide adds a significant amount to the fabrication cost in air handling alone. In this work, we have used alternative solvent systems with higher PEL for the fabrication of PSCs. All layers of a p-i-n PSC are slot-die coated using a R2R smart coater onto ITO PET substrate except the contact. The devices are completed with evaporation of a metallic contact. The optimization process for each layer will be discussed in detail.

The R2R processed device using the new solvent mixture resulted in stable power conversion efficiency (PCE) of 12.2%.

References:

[1] Lee, J.-W., Lee, D.-K., Jeong, D.-N. & Park, N.-G. Control of Crystal Growth toward Scalable Fabrication of Perovskite Solar Cells. Adv. Funct. Mater. 1807047 (2018). doi:10.1002/adfm.201807047

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