Highly Efficient Fullerene-Free Organic Solar Cells Operate at Near Zero Highest Occupied Molecular Orbital Offsets

Journal of the American Chemical Society, Год журнала: 2019, Номер 141(7), С. 3073 - 3082

Опубликована: Янв. 28, 2019

Herein, we investigated a series of fullerene-free organic solar cells (OSCs) based on six different donor:acceptor (D:A) blends with varied highest occupied molecular orbital (HOMO) offsets from -0.05 to 0.21 eV. First, verify the energetic compatibility specific D:A pair, especially for HOMO offsets, established simple method estimate hole transfer tendencies between D and A by using bilayer hole-only devices. It reveals that asymmetrical diode effect devices can correlate FF Jsc relevant OSCs. Second, find out whether offset is main restriction transfer, measured transient absorption spectra examined behavior in blends, revealing occurrence independent ultrafast time scale ≤4.6 ps those ≥0 eV offsets. In contrast, negative significantly slow down half-time ∼400 ps. Furthermore, compare device parameters under light intensities discover bimolecular recombination should be one restrictions high performance. Surprisingly, small 0 0.06 also enable PCEs 10.42% 11.75% blend 2 (PTQ10:HC-PCIC) 3 (PBDB-TF:HC-PCIC), respectively. Overall, our work demonstrates not only validity high-performance OSCs operating at near zero but charge dynamic insights these which will help gain understanding further improvement

Язык: Английский

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A universal layer-by-layer solution-processing approach for efficient non-fullerene organic solar cells

Energy & Environmental Science, Год журнала: 2018, Номер 12(1), С. 384 - 395

Опубликована: Дек. 8, 2018

A universal layer-by-layer solution-processing approach is proven to be effective for the fabrication of high-performance non-fullerene organic solar cells.

Язык: Английский

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Reduced Energy Loss Enabled by a Chlorinated Thiophene‐Fused Ending‐Group Small Molecular Acceptor for Efficient Nonfullerene Organic Solar Cells with 13.6% Efficiency

Advanced Energy Materials, Год журнала: 2019, Номер 9(18)

Опубликована: Март 18, 2019

Abstract Generally, highly efficient organic solar cells require both a high open‐circuit voltage ( V OC ) and short‐circuit current density J SC ). Reducing the energy loss E is an effective way to achieve without compromising photocurrent, which ideal for enhancing power conversion efficiencies (PCEs). Herein, new chlorinated nonfullerene acceptor (ITC‐2Cl) with thiophene‐fused end groups developed. In comparison unchlorinated counterpart (ITCPTC), introduction of Cl improves not only electronic properties by redshifting absorption spectra deepening lowest unoccupied molecular orbital levels, but also packing thus thin‐film morphology. The PM6:ITC‐2Cl‐based device yields significantly higher PCE (13.6%) lower (0.67 eV) than ITCPTC‐based (PCE 12.3% 0.70 eV). More importantly, compared archetypal acceptors such as IT‐4F 12.9% 0.73 IT‐4Cl 12.7% 0.76 eV), ITC‐2Cl‐based shows . These results demonstrate that group promising candidate high‐performance low loss.

Язык: Английский

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Impact of end groups on the performance of non-fullerene acceptors for organic solar cell applications

Journal of Materials Chemistry A, Год журнала: 2019, Номер 7(40), С. 22701 - 22729

Опубликована: Янв. 1, 2019

Non-fullerene organic solar cells employing small molecule acceptors have recently crossed the PCE of 17% through design and synthesis efficient acceptor materials.

Язык: Английский

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Progress in non-fullerene acceptor based organic solar cells

Solar Energy Materials and Solar Cells, Год журнала: 2019, Номер 193, С. 22 - 65

Опубликована: Янв. 10, 2019

Язык: Английский

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Guest-oriented non-fullerene acceptors for ternary organic solar cells with over 16.0% and 22.7% efficiencies under one-sun and indoor light

Nano Energy, Год журнала: 2020, Номер 75, С. 104896 - 104896

Опубликована: Май 16, 2020

Язык: Английский

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Nonfullerene small-molecule acceptors with perpendicular side-chains for fullerene-free solar cells

Journal of Materials Chemistry A, Год журнала: 2018, Номер 6(32), С. 15433 - 15455

Опубликована: Янв. 1, 2018

This review gives an in-depth understanding of structure–performance relationships achieved from fused-ring based nonfullerene acceptors with perpendicular side-chains.

Язык: Английский

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Isomerization of Perylene Diimide Based Acceptors Enabling High‐Performance Nonfullerene Organic Solar Cells with Excellent Fill Factor

Advanced Science, Год журнала: 2019, Номер 6(6)

Опубликована: Янв. 30, 2019

Abstract A strategy that employs the central‐core regiochemistry to develop two isomeric perylene diimide (PDI)‐based small molecular acceptors (SMAs), BPT‐Se and BPT‐Se1, is introduced, effect of on optical, electronic, charge‐transport, photovoltaic, morphological properties molecules their devices investigated. The PDBT‐T1:BPT‐Se1‐based device delivers a power conversion efficiency (PCE) 9.54% with an excellent fill factor (FF) 73.2%, while BPT‐Se‐based yields PCE 7.78%. large improvement upon isomerization should be ascribed concurrent enhancement FF, short circuit current ( J SC ), open voltage V OC ) PDBT‐T1:BPT‐Se1 devices. higher FF organic solar cells (OSCs) based can attributed charge dissociation collection efficiency, less bimolecular combination, more balanced µ h / e , better packing favorable morphology. It worth mentioning 73.2% highest value for PDI‐based SMAs OSCs date. result shows central core in greatly affects physicochemical photovoltaic performance. success offers exciting prospects design SMAs.

Язык: Английский

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Environmental and economic impacts of solar‐powered integrated greenhouses

Journal of Industrial Ecology, Год журнала: 2019, Номер 24(1), С. 234 - 247

Опубликована: Авг. 13, 2019

Abstract Greenhouse vegetable production plays a vital role in providing year‐round fresh vegetables to global markets, achieving higher yields, and using less water than open‐field systems, but at the expense of increased energy demand. This study examines life cycle environmental economic impacts integrating semitransparent organic photovoltaics (OPVs) into greenhouse designs. We employ assessment analyze six associated with producing greenhouse‐grown tomatoes Solar PoweRed INtegrated (SPRING) compared conventional greenhouses without an adjacent solar photovoltaic array, across three distinct locations. The SPRING design produces significant reductions impacts, particularly regions high insolation electricity‐intensive demands. For example, Arizona, warming potential values for conventional, PV are found be 3.71, 2.38, 2.36 kg CO 2 eq/kg tomato, respectively. Compared greenhouse, may increase burdens colder because shading effect OPV increases heating Our analysis shows that designs must maintain crop yields levels similar order economically competitive. Assuming consistent uncertainty average net present cost Arizona $3.43, $3.38, $3.64 per tomato system,

Язык: Английский

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Recent Progress in the Design of Fused-Ring Non-Fullerene Acceptors─Relations between Molecular Structure and Optical, Electronic, and Photovoltaic Properties

ACS Applied Energy Materials, Год журнала: 2021, Номер 4(11), С. 11899 - 11981

Опубликована: Окт. 26, 2021

Organic solar cells are on the dawn of next era. The change focus toward non-fullerene acceptors has introduced an enormous amount organic n-type materials and drastically increased power conversion efficiencies photovoltaics, now exceeding 18%, a value that was believed to be unreachable some years ago. In this Review, we summarize recent progress in design ladder-type fused-ring 2018–2020. We thereby concentrate single layer heterojunction omit tandem architectures as well ternary cells. By analyzing more than 700 structures, highlight basic principles their influence optical electrical structure acceptor molecules review photovoltaic performance obtained so far. This Review should give extensive overview plenitude motifs but will also help understand which structures strategies beneficial for designing highly efficient

Язык: Английский

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