Non-Fullerene Electron Acceptors for Use in Organic Solar Cells
Christian B. Nielsen,Sarah Holliday,Hung-Yang Chen,Samuel J. Cryer,Iain McCulloch,Iain McCulloch +5 more
TLDR
The motivation to replace fullerene acceptors stems from their synthetic inflexibility, leading to constraints in manipulating frontier energy levels, as well as poor absorption in the solar spectrum range, and an inherent tendency to undergo postfabrication crystallization, resulting in device instability.Abstract:
ConspectusThe active layer in a solution processed organic photovoltaic device comprises a light absorbing electron donor semiconductor, typically a polymer, and an electron accepting fullerene acceptor. Although there has been huge effort targeted to optimize the absorbing, energetic, and transport properties of the donor material, fullerenes remain as the exclusive electron acceptor in all high performance devices. Very recently, some new non-fullerene acceptors have been demonstrated to outperform fullerenes in comparative devices. This Account describes this progress, discussing molecular design considerations and the structure–property relationships that are emerging.The motivation to replace fullerene acceptors stems from their synthetic inflexibility, leading to constraints in manipulating frontier energy levels, as well as poor absorption in the solar spectrum range, and an inherent tendency to undergo postfabrication crystallization, resulting in device instability. New acceptors have to address ...read more
Citations
More filters
Journal ArticleDOI
Molecular Optimization Enables over 13% Efficiency in Organic Solar Cells
TL;DR: The PBDB-T-SF:IT-4F-based OSC device showed a record high efficiency, and an efficiency of over 12% can be obtained with a thickness of 100-200 nm, suggesting the promise of fullerene-free OSCs in practical applications.
Journal ArticleDOI
Organic solar cells based on non-fullerene acceptors.
TL;DR: Non-fullerene OSCs show great tunability in absorption spectra and electron energy levels, providing a wide range of new opportunities, and this Review highlights these opportunities made possible by NF acceptors.
Journal ArticleDOI
Non-fullerene acceptors for organic solar cells
TL;DR: Non-fullerene acceptors (NFAs) are currently a major focus of research in the development of bulk-heterojunction organic solar cells (OSCs) as mentioned in this paper.
Journal ArticleDOI
Next-generation organic photovoltaics based on non-fullerene acceptors
TL;DR: In this article, the authors highlight recent progress on single-junction and tandem NFA solar cells and research directions to achieve even higher efficiencies of 15-20% using NFA-based organic photovoltaics are also proposed.
Journal ArticleDOI
Energy-Level Modulation of Small-Molecule Electron Acceptors to Achieve over 12% Efficiency in Polymer Solar Cells
TL;DR: The two new SMAs (IT-M and IT-DM) end-capped by methyl-modified dicycanovinylindan-1-one exhibit upshifted lowest unoccupied molecular orbital (LUMO) levels, and hence higher open-circuit voltages can be observed in the corresponding devices.
References
More filters
Journal ArticleDOI
An electron acceptor challenging fullerenes for efficient polymer solar cells.
TL;DR: A novel non-fullerene electron acceptor (ITIC) that overcomes some of the shortcomings of fullerene acceptors, for example, weak absorption in the visible spectral region and limited energy-level variability, is designed and synthesized.
Journal ArticleDOI
Aggregation and morphology control enables multiple cases of high-efficiency polymer solar cells.
Yuhang Liu,Jingbo Zhao,Zhengke Li,Cheng Mu,Wei Ma,Huawei Hu,Kui Jiang,Haoran Lin,Harald Ade,He Yan +9 more
TL;DR: The uncovered aggregation and design rules yield three high-efficiency (>10%) donor polymers and will allow further synthetic advances and matching of both the polymer and fullerene materials, potentially leading to significantly improved performance and increased design flexibility.
Journal ArticleDOI
Perylene imides for organic photovoltaics: yesterday, today, and tomorrow.
Chen Li,Henrike Wonneberger +1 more
TL;DR: The relationship between the photovoltaic performance and the structure of perylene imides is discussed and perylene imides-based copolymers or oligomers play an important role in single junction devices.
Journal ArticleDOI
High-performance fullerene-free polymer solar cells with 6.31% efficiency
TL;DR: In this paper, a non-fullerene electron acceptor (IEIC) based on indaceno[1,2-b:5,6-b′]dithiophene and 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile was designed and synthesized.
Journal ArticleDOI
8.4% efficient fullerene-free organic solar cells exploiting long-range exciton energy transfer
TL;DR: A simple three-layer architecture comprising two non-fullerene acceptors and a donor, in which an energy-relay cascade enables an efficient two-step exciton dissociation process, confirms that multilayer cascade structures are a promising alternative to conventional donor- fullerene organic solar cells.