What is special about Y6; the working mechanism of neat Y6 organic solar cells

Sağlamkaya, Elifnaz; Musiienko, Artem; Shadabroo, Mohammad Saeed; Sun, Bowen; Chandrabose, Sreelakshmi; Shargaieva, Oleksandra; Gerfo, Giulia Lo; Hulst, Niek F. van; Shoaee, Safa

doi:10.1039/d2mh01411d

Cited by 27 publications

(28 citation statements)

References 47 publications

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“…A fully solution-processed bilayer of Y6/CuSCN, where an interface with CuSCN facilitates the splitting of excitons, achieved similar performance . With the same material pairing, 4.5% PCE was achieved after optimizing processing conditions . To ensure comparability within our study, all Y6 layers in this work were coated in the same way.…”

Section: Resultsmentioning

confidence: 79%

“…33 With the same material pairing, 4.5% PCE was achieved after optimizing processing conditions. 34 To ensure comparability within our study, all Y6 layers in this work were coated in the same way. Li and Lin 26 discussed the benefits of using a bilayer planar heterojunction architecture over conventional BHJs by fabricating devices similar to ours, employing Y6 and different evaporated donors, and found reduced voltage losses for the planar vs BHJs.…”

Section: ■ Resultsmentioning

confidence: 99%

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Vacuum-Deposited Donors for Low-Voltage-Loss Nonfullerene Organic Solar Cells

Kaienburg

Bristow

Jungbluth

et al. 2023

ACS Appl. Mater. Interfaces

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The advent of nonfullerene acceptors (NFAs) enabled records of organic photovoltaics (OPVs) exceeding 19% power conversion efficiency in the laboratory. However, high-efficiency NFAs have so far only been realized in solution-processed blends. Due to its proven track record in upscaled industrial production, vacuum thermal evaporation (VTE) is of prime interest for real-world OPV commercialization. Here, we combine the benchmark solution-processed NFA Y6 with three different evaporated donors in a bilayer (planar heterojunction) architecture. We find that voltage losses decrease by hundreds of millivolts when VTE donors are paired with the NFA instead of the fullerene C60, the current standard acceptor in VTE OPVs. By showing that evaporated small-molecule donors behave much like solution-processed donor polymers in terms of voltage loss when combined with NFAs, we highlight the immense potential for evaporable NFAs and the urgent need to direct synthesis efforts toward making smaller, evaporable compounds.

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Section: Resultsmentioning

confidence: 79%

Section: ■ Resultsmentioning

confidence: 99%

Vacuum-Deposited Donors for Low-Voltage-Loss Nonfullerene Organic Solar Cells

Kaienburg

Bristow

Jungbluth

et al. 2023

ACS Appl. Mater. Interfaces

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“…However, there is very few successful case exploring the D:A heterojunction free OPV. [26,32] In this work, we demonstrate the high-efficiency heterojunction-free device by taking advantage of the recent progress on organic semiconductors. We use a simple P-I-N device structure to incorporate single layer non-fullerene acceptors as photoactive layer working as both photon absorber and charge transporter.…”

Section: Background and Originality Contentmentioning

confidence: 99%

The Potential Game‐Changer: A Concept‐to‐Proof Study on D:A Heterojunction‐Free Organic Photovoltaics^†

Zuo,

Jo,

Shi

et al. 2023

Chin. J. Chem.

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Comprehensive SummarySince 1986, the donor‐acceptor (D:A) heterojunction has been regarded a necessity for high‐efficiency organic photovoltaics (OPVs), due to its unique advantage in compensating the intrinsic limitations of organic semiconductors, such as high exciton binding energy and poor ambipolar charge mobility. While this adversely causes tremendous non‐radiative charge recombination and instability issues, which currently become the most critical limits for commercialization of OPVs. Here, we present a concept‐to‐proof study on the potential of D:A heterojunction free OPV by taking advantage of recent progress of non‐fullerene acceptors. First, we demonstrate that the “free carriers” can be spontaneously generated upon illumination in an NFA, i.e. the 6TIC‐4F single layer. Second, the 6TIC‐4F layer also exhibits good ambipolar charge transporting property. These exceptional characteristics distinguish it from the traditional organic semiconductors, and relieve it from the reliance of D:A heterojunction to independently work as active layer. As a result, the subsequent OPV by simply sandwiching the 6TIC‐4F layer between the cathode and anode yields a considerably high power conversion efficiency ~ 1%. Moreover, we find the D:A heterojunction free device exhibits two order of magnitude higher electroluminescence quantum efficiency and significantly reduced VOC loss by 0.16 eV compared to those of the D:A BHJ structure, validating its promise for higher efficiency in the future. Therefore, our work demonstrates the possibility of using D:A heterojunction‐free device structure for high performance, that can potentially become the next game changer of OPV.This article is protected by copyright. All rights reserved.

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“…[27] Nevertheless, OPV devices fabricated with Y6 used as a singlecomponent photoactive layer show poor performance. [27,28] In this study, we utilize these distinctive properties of Y6 in single-component OPDs and elucidate the molecular origins of electronic states and interfacial energetics that are key to the photophysical processes such as charge generation, recombination, and extraction. In particular, the impact of the molecular structures (e.g., planar vs twisted) and molecular properties (e.g., quadrupole moment, intermolecular interaction, and packing) of NFAs on these processes is identified using planar Y6 versus twisted O-IDFBR [29] and other representative NFAs with planar molecular structure but different quadrupole moment along 𝜋-𝜋 stacking direction (Q 𝜋 ) values and D/A character such as IDIC [30] and IT-4F.…”

Section: Introductionmentioning

confidence: 99%

“…[ 27 ] Nevertheless, OPV devices fabricated with Y6 used as a single‐component photoactive layer show poor performance. [ 27,28 ]…”

Section: Introductionmentioning

confidence: 99%

The State‐of‐the‐Art Solution‐Processed Single Component Organic Photodetectors Achieved by Strong Quenching of Intermolecular Emissive State and High Quadrupole Moment in Non‐Fullerene Acceptors

Park,

Labanti,

Pacalaj

et al. 2023

Advanced Materials

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A bulk‐heterojunction (BHJ) blend is commonly used as the photoactive layer in organic photodetectors (OPDs) to utilize the donor (D)/acceptor (A) interfacial energetic offset for exciton dissociation. However, this strategy often complicates optimization procedures, raising serious concerns over device processability, reproducibility and stability. Herein, we demonstrate highly efficient OPDs fabricated with single‐component organic semiconductors via solution‐processing. The non‐fullerene acceptors (NFAs) with strong intrinsic D/A character are used as the photoactive layer, where the emissive intermolecular charge transfer excitonic (CTE) states are formed within <1 ps, and efficient photocurrent generation is achieved via strong quenching of these CTE states by reverse bias. Y6 and IT‐4F based OPDs show excellent OPD performances; low dark current density (∼10−9 A cm−2), high responsivity (≥ 0.15 A W−1), high specific detectivity (> 1012 Jones) and fast photo‐response time (< 10 µs), comparable to the state‐of‐the‐art BHJ OPDs. Together with strong CTE state quenching by electric field, these excellent OPD performances are also attributed to the high quadrupole moments of NFA molecules, which can lead to large interfacial energetic offset for efficient CTE dissociation. Our work opens a new way to realize efficient OPDs using single‐component systems via solution‐processing and provides important molecular design rules.This article is protected by copyright. All rights reserved

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What is special about Y6; the working mechanism of neat Y6 organic solar cells

Abstract: Morphological modification by DIO additive facilitates charge generation in the bulk of Y6, suppresses the bimolecular recombination, which results in an increased JSC and FF of single component Y6 solar cells.

Cited by 27 publications

References 47 publications

Vacuum-Deposited Donors for Low-Voltage-Loss Nonfullerene Organic Solar Cells

Vacuum-Deposited Donors for Low-Voltage-Loss Nonfullerene Organic Solar Cells

The Potential Game‐Changer: A Concept‐to‐Proof Study on D:A Heterojunction‐Free Organic Photovoltaics^†

The State‐of‐the‐Art Solution‐Processed Single Component Organic Photodetectors Achieved by Strong Quenching of Intermolecular Emissive State and High Quadrupole Moment in Non‐Fullerene Acceptors

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What is special about Y6; the working mechanism of neat Y6 organic solar cells

Abstract: Morphological modification by DIO additive facilitates charge generation in the bulk of Y6, suppresses the bimolecular recombination, which results in an increased JSC and FF of single component Y6 solar cells.

Cited by 27 publications

References 47 publications

Vacuum-Deposited Donors for Low-Voltage-Loss Nonfullerene Organic Solar Cells

Vacuum-Deposited Donors for Low-Voltage-Loss Nonfullerene Organic Solar Cells

The Potential Game‐Changer: A Concept‐to‐Proof Study on D:A Heterojunction‐Free Organic Photovoltaics†

The State‐of‐the‐Art Solution‐Processed Single Component Organic Photodetectors Achieved by Strong Quenching of Intermolecular Emissive State and High Quadrupole Moment in Non‐Fullerene Acceptors

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The Potential Game‐Changer: A Concept‐to‐Proof Study on D:A Heterojunction‐Free Organic Photovoltaics^†