Water−Processed Organic Solar Cell with Efficiency Exceeding 11%

Abstract

Water processing is an ideal strategy for the ecofriendly fabrication of organic photovoltaics (OPVs) and exhibits a strong market−driven demand. Here, we report a state−of−the−art active material, namely PM6:BTP−eC9, for the synthesis of water−borne nanoparticle (NP) dispersion towards ecofriendly OPV fabrication. The surfactant−stripping technique, combined with a poloxamer, facilitates purification and eliminates excess surfactant in water−dispersed organic semiconducting NPs. The introduction of 1,8−diiodooctane (DIO) for the synthesis of surfactant−stripped NP (ssNP) further promotes a percolated microstructure of the polymer and NFA in each ssNP, yielding water−processed OPVs with a record efficiency of over 11%. The use of an additive during water−borne ssNP synthesis is a promising strategy for morphology optimization in NP OPVs. It is believed that the findings in this work will engender more research interest and effort relating to water−processing in preparation of the industrial production of OPVs.

Sub-4 nm mapping of donor–acceptor organic semiconductor nanoparticle composition

“…55 High efficiency OPV devices have been achieved with nanoparticles presenting intermixed morphology, generally obtained from the nanopre- cipitation method, but also the miniemulsion method in several cases. 8,13,56,57 One can highlight the 7.5% PCE achieved for the PBQ-QF:ITIC system 8 from water-based dispersions and 4.3% for P3HT:ICBA 58 from alcohol-based dispersions. It has been shown in several studies by the Venkataraman group 59,60 that, if the surfactant is efficiently removed, the charge transport in OPV devices is not drastically affected and it is comparable to thin films deposited from organic solvents.…”

Green‐Processed Non‐Fullerene Organic Solar Cells Based on Y‐Series Acceptors

“…[28] Copyright 2022, Springer Nature Publishing Group. [97] Copyright 2022, The Authors. Published by MDPI.…”

“…b) Characterization of nanoparticles and the retention of poloxamer after several washing times. Reproduced with permission [97]. Copyright 2022, The Authors.…”

A newly designed benzodithiophene building block: tuning of the torsional barrier for non-halogenated and non-aromatic solvent-processible photovoltaic polymers

“…[24][25][26] Non-halogenated and non-aromatic solvents (such as tetrahydrofuran (THF), 2methyltetrahydrofuran, and ethanol) can be ideal processing solvents for the mass production of OSCs via roll-to-roll processes. [27][28][29][30][31] The successful demonstration of OSC devices using non-halogenated and non-aromatic solvents has been very limited. 32 To overcome the solubility issue of organic semiconductors in eco-friendly solvents, previous studies mainly focused on the side-chain engineering, i.e., branched ones with shiing a branch point, asymmetric side chain strategy, swapping the position of alkyl side chains, and introduction of polarizable oligo(ethylene glycol) side chains.…”