Non-fullerene organic solar cells with 7% efficiency and excellent air stability through morphological and interfacial engineering

Liyakath, Reshma; Santhakumar, Kannappan

doi:10.1016/j.orgel.2017.05.002

Cited by 26 publications

(16 citation statements)

References 50 publications

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“…Utilising NFAs in OSCs have resulted in some advances in the photochemical stability of OSCs, with for example, some early case studies demonstrating improved OSC stability based on NFAs in binary or ternary blends, in dark, [46][47][48][49][50] or under illumination 51,52 with single-junction or tandem device configurations 53,54 compared to fullerene based OSCs. However, the photochemical stability of NFA based OSCs is still far from being stable and there remains a significant lack of understanding in the community in the molecular design of NFAs to achieve high photochemical stability without compromising OSC efficiency.…”

Section: Non-fullerene Acceptorsmentioning

confidence: 99%

From fullerene acceptors to non-fullerene acceptors: prospects and challenges in the stability of organic solar cells

et al. 2019

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Section: Non-fullerene Acceptorsmentioning

confidence: 99%

From fullerene acceptors to non-fullerene acceptors: prospects and challenges in the stability of organic solar cells

et al. 2019

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“…showed their nonfullerene‐based BHJ retained 70% of its efficiency after 1200 h exposure to air, while fullerene‐based OPVs (employing a PCBM acceptor material) were nonfunctional after the same exposure due to poor oxidative stability. [ 91 ] Similar studies have been performed to observe the increased stability of such devices, [ 89,92,93 ] however significant lifetime improvement of OPVs under operational conditions is a scarcely documented topic in literature with vast potential for further development.…”

Section: Fundamentalsmentioning

confidence: 89%

A Review on Emerging Barrier Materials and Encapsulation Strategies for Flexible Perovskite and Organic Photovoltaics

Sutherland

Weerasinghe

Simon

2021

Advanced Energy Materials

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Perovskite solar cells (PSCs) and organic photovoltaics (OPVs) have undergone rapid development within the last decade, exhibiting exciting properties such as high efficiency, flexibility, and the potential for large‐scale fabrication through roll‐to‐roll (R2R) processing. Despite this, operational stability is recognized to be an ongoing challenge as prolonged device lifetimes are scarcely observed. This instability can be narrowed down to both “intrinsic degradation” and “extrinsic degradation,” with exposure to moisture and oxygen having detrimental effects on device performance. A means of delaying the degradation of flexible PSC and OPV devices is through barrier encapsulation. Despite glass encapsulation exhibiting ideal barrier properties, the potential for flexible devices and high‐throughput R2R fabrication requires the development of flexible barrier materials and encapsulation strategies. These barriers must demonstrate outstanding moisture permeation resistance, high transparency, chemical and thermal stability, and must be able to withstand repeated mechanical deformation. Herein, the fundamental principles of PSC and OPV devices are initially discussed, highlighting the degradation mechanisms and current stability obstacles. A review of the latest flexible barrier materials and encapsulation strategies follows, introducing stability studies that have been undertaken on flexible PSCs and OPV, along with suggestions as to the direction that future research may take.

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“…It is also possible to increase the device

while maintaining a high

which is not possible with the fullerene based OSC [ 33 ]. This is achieved because of the easy tunability of bandgap energy of the NF acceptor materials and the low binding energy of the CT excitons which reduces the energy loss at the CT state to dissociate the excitons into free charge carriers [ 33 ]. To the best of the authors’ knowledge, little theoretical work has been done in understanding the characteristics of exciton generation in conventional and inverted NF acceptor based BHJ OSCs.…”

Section: Introductionmentioning

confidence: 99%

“…Unlike the fullerene OSCs, the NF devices are much easier to process using solution-based chemistry [32]. It is also possible to increase the device V oc while maintaining a high J sc which is not possible with the fullerene based OSC [33]. This is achieved because of the easy tunability of bandgap energy of the NF acceptor materials and the low binding energy of the CT excitons which reduces the energy loss at the CT state to dissociate the excitons into free charge carriers [33].…”

Section: Introductionmentioning

confidence: 99%

Characterising Exciton Generation in Bulk-Heterojunction Organic Solar Cells

et al. 2021

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In this paper, characterisation of exciton generation is carried out in three bulk-heterojunction organic solar cells (BHJ OSCs)—OSC1: an inverted non-fullerene (NF) BHJ OSC; OSC2: a conventional NF BHJ OSC; and OSC3: a conventional fullerene BHJ OSC. It is found that the overlap of the regions of strong constructive interference of incident and reflected electric fields of electromagnetic waves and those of high photon absorption within the active layer depends on the active layer thickness. An optimal thickness of the active layer can thus be obtained at which this overlap is maximum. We have simulated the rates of total exciton generation and position dependent exciton generation within the active layer as a function of the thicknesses of all the layers in all three OSCs and optimised their structures. Based on our simulated results, the inverted NF BHJ OSC1 is found to have better short circuit current density which may lead to better photovoltaic performance than the other two. It is expected that the results of this paper may provide guidance in fabricating highly efficient and cost effective BHJ OSCs.

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Non-fullerene organic solar cells with 7% efficiency and excellent air stability through morphological and interfacial engineering

Cited by 26 publications

References 50 publications

From fullerene acceptors to non-fullerene acceptors: prospects and challenges in the stability of organic solar cells

From fullerene acceptors to non-fullerene acceptors: prospects and challenges in the stability of organic solar cells

A Review on Emerging Barrier Materials and Encapsulation Strategies for Flexible Perovskite and Organic Photovoltaics

Characterising Exciton Generation in Bulk-Heterojunction Organic Solar Cells

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