Inhibiting excessive molecular aggregation to achieve highly efficient and stabilized organic solar cells by introducing a star-shaped nitrogen heterocyclic-ring acceptor

Energy & Environmental Science, Год журнала: 2021, Номер 15(1), С. 384 - 394

Опубликована: Дек. 3, 2021

A star-shaped nitrogen heterocyclic-ring acceptor TF1 featuring a unique 3D skeleton was successfully utilized to inhibit excessive molecular aggregation of Y6 improve the stability and performance organic solar cells.

Язык: Английский

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High‐Efficiency ITO‐Free Organic Photovoltaics with Superior Flexibility and Upscalability

Advanced Materials, Год журнала: 2022, Номер 34(17)

Опубликована: Март 3, 2022

Developing indium-tin-oxide (ITO)-free flexible organic photovoltaics (OPVs) with upscaling capacity is of great significance for practical applications OPVs. Unfortunately, the efficiencies corresponding devices lag far behind those ITO-based rigid small-area counterparts. To address this issue, an advanced device configuration designed and fabricated featuring a top-illuminated structure ultrathin Ag as transparent electrode. First, conjugated polyelectrolyte layer, i.e., PCP-Li, inserted to effectively connect bottom anode hole transport achieving good photon electron conversion. Second, charge collecting grids are deposited suppress increased resistance loss area, realizing almost full retention efficiency from 0.06 1 cm2 . Third, delivers best 15.56% area on polyimide substrate, representing record among ITO-free, large-area, Interestingly, exhibits no degradation after 100 000 bending cycles radius 4 mm, which result This work provides insight into design optimization OPVs high efficiency, low cost, superior flexibility, capacity, indicating potential future commercialization

Язык: Английский

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Recent Advances in Nonfullerene Acceptor‐Based Layer‐by‐Layer Organic Solar Cells Using a Solution Process

Advanced Science, Год журнала: 2022, Номер 9(25)

Опубликована: Июль 6, 2022

Recently, sequential layer-by-layer (LbL) organic solar cells (OSCs) have attracted significant attention owing to their favorable p-i-n vertical phase separation, efficient charge transport/extraction, and potential for lab-to-fab large-scale production, achieving high power conversion efficiencies (PCEs) of over 18%. This review first summarizes recent studies on various approaches obtain ideal D/A separation in nonfullerene acceptor (NFAs)-based LbL OSCs by proper solvent selection, processing additives, protecting treatment, ternary blends, etc. Additionally, the longer exciton diffusion length NFAs compared with fullerene derivatives, which provides a new scope further improvement performance OSCs, is been discussed. Large-area device/module production techniques device stability issues, including thermal mechanical stability, are also reviewed. Finally, current challenges prospects progress toward eventual commercialization

Язык: Английский

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Tuning Morphology of Active Layer by using a Wide Bandgap Oligomer‐Like Donor Enables Organic Solar Cells with Over 18% Efficiency

Advanced Energy Materials, Год журнала: 2022, Номер 12(16)

Опубликована: Март 11, 2022

Abstract A wide bandgap oligomer‐like donor CNS‐6‐8 is synthesized and incorporated into the host PM6 : Y6 PC 71 BM system to tune morphology of active layer for better device performance. Due good miscibility with both ( ) acceptors ), an optimized achieved appropriate phase separation size enhanced crystallinity, which ultimately leads more efficient exciton dissociation, charge transport, lower nonradiative energy loss. As a result, quaternary achieves improved efficiency 18.07%, simultaneously increased open circuit voltage 0.868 V, fill factor 78.8%, comparable short‐circuit current density 26.43 mA cm −2 . This work indicates that favorable 3D interpenetrating network containing blend films can be by introducing small amount specific molecule high thus providing effective strategy achieve photovoltaic performance state‐of‐the‐art analogs‐based organic solar cells.

Язык: Английский

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An asymmetric small-molecule donor enables over 18% efficiency in ternary organic solar cells

Journal of Materials Chemistry A, Год журнала: 2022, Номер 10(17), С. 9746 - 9752

Опубликована: Янв. 1, 2022

An asymmetric small-molecule donor TTBT-R, incorporated with benzo[2,1-b:3,4- b ′]dithiophene derivative as the core, was exploited for ternary OSCs, and OSCs base on PM6:Y6 host TTBT-R guest achieved a PCE of 18.07%.

Язык: Английский

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Effects of Flexible Conjugation-Break Spacers of Non-Conjugated Polymer Acceptors on Photovoltaic and Mechanical Properties of All-Polymer Solar Cells

Nano-Micro Letters, Год журнала: 2022, Номер 14(1)

Опубликована: Авг. 13, 2022

All-polymer solar cells (all-PSCs) possess attractive merits including superior thermal stability and mechanical flexibility for large-area roll-to-roll processing. Introducing flexible conjugation-break spacers (FCBSs) into backbones of polymer donor (PD) or acceptor (PA) has been demonstrated as an efficient approach to enhance both the photovoltaic (PV) properties all-PSCs. However, length dependency FCBS on certain all-PSC related not systematically explored. In this regard, we report a series new non-conjugated PAs by incorporating with various lengths (2, 4, 8 carbon atoms in thioalkyl segments). Unlike common studies so-called side-chain engineering, where longer side chains would lead better solubility those resulting polymers, work, observe that solubilities photovoltaic/mechanical are optimized proper (i.e., C2) PA named PYTS-C2. Its achieves high efficiency 11.37%, excellent robustness crack onset strain 12.39%, significantly other PAs. These results firstly demonstrate effects PV performance all-PSCs, providing effective strategy fine-tune structures highly mechanically robust PSCs.

Язык: Английский

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18.9% Efficiency Ternary Organic Solar Cells Enabled by Isomerization Engineering of Chlorine‐Substitution on Small Molecule Donors

Advanced Functional Materials, Год журнала: 2023, Номер 33(30)

Опубликована: Апрель 17, 2023

Abstract Ternary organic solar cells (OSCs) represent an efficient and facile strategy to further boost the device performance. However, selection criteria rational design of third guest small molecule (SM) material still remain less understood. In this study, two new SM donor isomers, with α‐chlorinated thiophene (αBTCl) β‐chlorinated (βBTCl) as side chains, are systematically designed, synthesized incorporated a component in PM6:L8‐BO binary blends. It is noticed that introducing donors has extended absorption photo‐active layer, induced desired distribution vertically enhanced crystallinity reduced recombination process, leading increased short‐circuit current ( J SC ) improved fill factor. Moreover, due synergetic suppressed nonradiative loss preferable morphology, ternary OSCs feature improves open‐circuit voltage V OC ). Consequently, impressive champion power conversion efficiency 18.96% 18.55% achieved by αBTCl‐based βBTCl‐based OSCs, respectively. Furthermore, record 17.46% obtained 330 nm thickness OSCs. This study demonstrates molecular isomerization can be promising approach for construct high‐performance simultaneous enhancement all photovoltaic parameters.

Язык: Английский

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Exploring the significance of packing modes and 3D framework sizes and utilizing three chlorine-mediated acceptors and the “like dissolves like” approach for achieving an efficiency over 19%

Energy & Environmental Science, Год журнала: 2023, Номер 16(12), С. 5944 - 5955

Опубликована: Янв. 1, 2023

It revealed the packing arrangement of three representative chlorinated NFAs, showing differences from linear to compact 3D network structures, which suggests evolution direction NFA materials with gradually enhanced device performance.

Язык: Английский

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Wide-bandgap polymer donors for non-fullerene organic solar cells

Journal of Materials Chemistry A, Год журнала: 2022, Номер 11(1), С. 17 - 30

Опубликована: Ноя. 25, 2022

Herein, we summarize the recent progress of wide-bandgap polymer donors for non-fullerene organic solar cells and classify them into five categories. Also, perspectives on photovoltaics are highlighted.

Язык: Английский

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Over 19% Efficiency in Ternary Organic Solar Cells Enabled by n-Type Dopants

ACS Energy Letters, Год журнала: 2023, Номер 8(10), С. 4104 - 4112

Опубликована: Сен. 11, 2023

Molecular doping has become a valuable technique for enhancing the efficiency of high-performance organic photovoltaic systems (OPVs). However, number known dopant molecules, especially n-type ones, that enhance PCE OPVs remains limited. In this study, two dopants, ethyl viologen (EV) and methyl (MV), are synthesized incorporated into ternary PM6:BTP-eC9:PC71BM bulk heterojunction (BHJ) OPVs. Both dopants found to OPV performance, yielding maximum values 19.03% 18.61%, respectively. We show EV MV function as microstructure modifiers, π–π stacking while increasing absorption coefficient BHJs. Moreover, n-doping balances carrier mobility lifetime reducing bimolecular recombination. Our results demonstrate potential improve performance highly efficient levels beyond those achievable by pristine BHJ.

Язык: Английский

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