Issue 39, 2023

Layer-by-layer blade-coated organic solar cells with non-halogenated solvents and non-halogenated additive via adjusting morphology and crystallization

Abstract

Developing high-efficiency organic solar cells (OSCs) by layer-by-layer (LBL) blade-coating using non-halogenated solvents is eco-friendly and scalable for industrial production of OSCs. Therefore, searching for non-halogenated solvent additives and gaining insights into the morphological tuning mechanism are urgent for advancing the OSCs prepared by LBL blade-coating. We have investigated the effect of non-halogenated solvent additive 1,2-dimethylnaphthalene (DMN) in the upper o-Xylene (o-XY) solution of Y6 on the film formation kinetics of the LBL blade-coated PM6/Y6 active layer by in situ absorption spectroscopy. It is found that DMN induces nucleation and crystal growth of Y6 molecules twice during the LBL blade-coating process, promoting the formation of a nano-fiber phase separated and excellent crystalline morphology in the LBL PM6/Y6(o-XY + DMN) active layer and improving the exciton dissociation and charge extraction. Finally, a high power conversion efficiency (PCE) of 16.15% is achieved for the OSCs prepared using all non-halogenated solvents and LBL blade-coating. Furthermore, a large-area and high geometric fill factor OSC module with a PCE of 12.64% is fabricated based on the LBL PM6/Y6(o-XY + DMN) active layer, demonstrating the potential of a non-halogenated solvent additive for the eco-friendly large-scale fabrication of OSCs.

Graphical abstract: Layer-by-layer blade-coated organic solar cells with non-halogenated solvents and non-halogenated additive via adjusting morphology and crystallization

Supplementary files

Article information

Article type
Paper
Submitted
20 Jul 2023
Accepted
02 Sep 2023
First published
18 Sep 2023

J. Mater. Chem. C, 2023,11, 13263-13273

Layer-by-layer blade-coated organic solar cells with non-halogenated solvents and non-halogenated additive via adjusting morphology and crystallization

Y. Li, J. Wu, X. Yi, Z. Liu, H. Liu, Y. Fu, J. Liu and Z. Xie, J. Mater. Chem. C, 2023, 11, 13263 DOI: 10.1039/D3TC02562D

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