Flexible Blade-coated Perovskite Solar Cells with a Non-hazardous Solvent System Fabricated in Ambient Air
Farshad Jafarzadeh a, Luigi Angelo Castriotta a, Francesca De Rossi a, Aldo Di Carlo a b, Fabio Matteocci a, Francesca Brunetti a
a CHOSE (Centre for Hybrid and Organic Solar Energy), Department of Electronic Engineering, University of Rome Tor Vergata, Roma 00133, Italy
b CNR-ISM Istituto di Struttura della Materia, via del Fosso del Cavaliere 100, 00133 Rome, Italy
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Oral, Farshad Jafarzadeh, presentation 176
DOI: https://doi.org/10.29363/nanoge.hopv.2022.176
Publication date: 20th April 2022

Perovskite solar cells (PSC) are known as the record breaker technology among emerging photovoltaics, achieving up to 25.5% of power conversion efficiency (PCE) [1]. One of the major benefits of PSCs is the opportunity of employment of flexible substrates, which expand the potential applications of this technology. Recently, flexible perovskite solar cells (flex-PSCs) achieved over 20% PCE on small scale[2,3] and up to 15.5% PCE on 100 cm2 modules [2], with the perovskite layer only deposited via blade coating and the remaining layers by spin coating. 

To demonstrate flex-PSC on large scale and make the technology appealing to industry, reliable and sustainable fabrication routes, compatible with high throughput roll-to-roll manufacture, must be developed. Thus far, most studies of flex-PSCs are focusing on small-scale fabrication methods and hazardous solvents such as dimethylformamide (DMF), n-methyl-2-pyrrolidone (NMP), and 2-methoxyethanol (2-ME). 

Here, we present flex-PSC with device architecture of PET/ITO/SnO2/Cs0.1FA0.9Pb(I0.94Br0.06)3/ PTAA/Au, in which both the electron transport layer and the absorber are deposited by blade coating method on 5 ×7 cm2 flexible substrates. Notably, the perovskite layer is deposited in ambient air via a double-step air-flow assisted doctor blading method, starting from our previous work[4] and changing solvent system, using a DMF-free solvent system by using only dimethyl sulfoxide (DMSO). By fine-tuning the coating parameters, we obtained promising results in terms of PCE reaching  12.7% for 2.5 × 2.5 cm2 dimension cells obtained from cutting large-area substrates. In addition, to demonstrate the scalability of this double-step perovskite deposition method, we deposited films on flexible 10 × 10 cm2 substrates.

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