Solid additives in organic solar cells: progress and perspectives

Journal of Materials Chemistry C, Год журнала: 2021, Номер 10(7), С. 2364 - 2374

Опубликована: Окт. 26, 2021

The use of solid additives in organic solar cells has drawn great attention owing to its morphology-tuning ability. Here we review both and inorganic additives, which could provide useful guidance for the design additives.

Язык: Английский

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Introducing Low‐Cost Pyrazine Unit into Terpolymer Enables High‐Performance Polymer Solar Cells with Efficiency of 18.23%

Advanced Functional Materials, Год журнала: 2021, Номер 32(8)

Опубликована: Ноя. 8, 2021

Abstract Recently, a random ternary copolymerization strategy has become promising and efficient approach to develop high‐performance polymer donors for solar cells (PSCs). In this study, low‐cost electron‐withdrawing unit, 2,5‐bis(4‐(2‐ethylhexyl)thiophen‐2‐yl)pyrazine (PZ‐T), is incorporated into the backbone of PM6 as third component, three D‐A 1 ‐D‐A 2 type terpolymers PMZ‐10, PMZ‐20, PMZ‐30 are synthesized by strategy, with PZ‐T proportion 10%, 20%, 30%, respectively. The exhibit downshifted highest occupied molecular orbital energy levels than PM6, which beneficial obtaining higher open‐circuit voltage ( V oc ) PSCs donor. Importantly, based on PMZ‐10:Y6 demonstrate exciton dissociation, balanced electron/hole mobilities, desirable aggregation, high power conversion efficiency 18.23%, among terpolymer‐based so far. results indicate that second A‐unit an further improve photovoltaic performance reduce synthetic cost copolymer donors.

Язык: Английский

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High‐Efficiency Organic Solar Cells with Reduced Nonradiative Voltage Loss Enabled by a Highly Emissive Narrow Bandgap Fused Ring Acceptor

Advanced Functional Materials, Год журнала: 2021, Номер 32(9)

Опубликована: Ноя. 18, 2021

Abstract Increasing the photoluminescence quantum yield (PLQY) of narrow bandgap acceptors is critical importance to suppress nonradiative voltage loss (Δ V nr ) in organic solar cells (OSCs). Herein, two acceptors, SM16 and SM16‐R , with an identical backbone but different terminal groups (norbornenyl modified 1,1‐dicyanomethylene‐3‐indanone dimethyl substituted 1,1‐dicyanomethylene‐3‐indanone) are designed synthesized. Compared displays better solubility, higher PLQY, more favorable nanomorphology when blended polymer donor PBDB‐T. PBDB‐T: ‐based OSCs a Δ as low 0.145 V. Using third component, high power conversion efficiency 17.1% achieved ternary based on PBDB‐T:Y14: considerably than that binary devices PBDB‐T:Y14 or . These results highlight enhancing PLQY acceptor via group engineering strategy highly effective reduce OSCs.

Язык: Английский

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High‐Efficiency Organic Solar Cells Based on Asymmetric Acceptors Bearing One 3D Shape‐Persistent Terminal Group

Advanced Functional Materials, Год журнала: 2021, Номер 31(35)

Опубликована: Июнь 23, 2021

Abstract Three asymmetric non‐fullerene acceptors (LL2, LL3, and LL4) are designed synthesized with one norbornyl‐modified 1,1‐dicyanomethylene‐3‐indanone (CBIC) terminal group chlorinated (IC‐2Cl) group. The three‐dimensional shape‐persistent CBIC can effectively enhance the solubility tune packing mode of acceptors. Compared their symmetric counterparts (LL2‐2Cl, LL3‐2Cl, LL4‐2Cl) bearing two IC‐2Cl terminals, show improved solubilities, giving rise to enhanced crystallinity favored nanomorphology for charge transport in blend films PBDB‐T. Asymmetric based organic solar cells (OSCs) also much lower voltage loss due higher E CT EQE EL values. Therefore, they exhibit 17−27% power conversion efficiency (PCE) than OSCs on corresponding Among these six acceptors, LL3 a central benzotriazole core shows best PCE 16.82% an outstanding J sc 26.97 mA cm −2 low nonradiative (Δ V nr ) 0.18 V, values PBDB‐T OSCs. Δ represent reported acceptors‐based date. results demonstrate that combination unique strategy is promising way performance

Язык: Английский

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A generic approach yields organic solar cells with enhanced efficiency and thermal stability

Aggregate, Год журнала: 2022, Номер 4(2)

Опубликована: Ноя. 5, 2022

Abstract The use of deuterium are critical for promoting the fundamental understanding aggregate materials and their new functions. Particularly, solution structure conjugated polymers can be hardly resolved without deuteration. However, studies about isotopic effects casting solvents on aggregated structures photovoltaic bulk‐heterojunction blends deficient. Here, impact deuterated thermal behavior, structures, device performance is clearly delineated first time by multiple techniques. enhanced π‐π stacking order highly relevant to relatively poor miscibility with solvents. Benefiting from higher crystallinity optimized morphology processed films, devices able achieve better efficiency notable improvement in stability. Our results highlight polymer systems reveal potential innovative approaches fabricate thermally stable high‐efficiency solar cells.

Язык: Английский

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A Broad-Spectrum Solid Additive to Further Boost High-Efficiency Organic Solar Cells via Morphology Regulation

ACS Energy Letters, Год журнала: 2023, Номер 8(8), С. 3494 - 3503

Опубликована: Июль 24, 2023

Given the great potential for achieving record breaking organic solar cells (OSCs), newly explored solid additives that could optimize nanoscale morphology of active layers have rapidly gained widespread attention. Herein, a new volatile additive 2,5-dichlorothieno[3,2-b]thiophene (TT-Cl) is delicately explored, fully satisfying design criteria planar conjugated skeleton with suitable molecular size, symmetrical geometry, and proper halogenation. When applied in state-of-the-art OSCs diverse layers, quite high crystallinity TT-Cl strong interactions light-harvesting components lead to optimized crystalline ordering, fibrillar networks, vertical phase distributions, thus offering significant performance enhancement. Consequently, PM6:Y6-based binary ternary achieved PCEs 18.20% 18.95%, respectively. Moreover, PM6:CH23-based presented an outstanding PCE 18.72%. Our work not only provides broad-spectrum film morphologies powerfully but also manifests record-breaking OSCs.

Язык: Английский

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Exciton diffusion and dissociation in organic and quantum‐dot solar cells

SmartMat, Год журнала: 2023, Номер 4(6)

Опубликована: Янв. 27, 2023

Abstract For the process of photovoltaic conversion in organic solar cells (OSCs) and quantum‐dot (QDSCs), three four steps are determined by exciton behavior, namely, generation, diffusion, dissociation. Therefore, it is great importance to regulate behavior OSCs QDSCs for achieving high power efficiency. Due rapid development materials device fabrication, progress has been made manage achieve prolonged diffusion length improved dissociation recent years. In this review, we first introduce parameters that affect followed methods measure length. Then, provide an overview advances with regard investigation QDSCs, including lifetime, coefficient, Finally, propose future directions deepening understanding boosting performance QDSCs.

Язык: Английский

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Green‐Solvent‐Processed High‐Performance Ternary Organic Solar Cells Comprising a Highly Soluble and Fluorescent Third Component

Advanced Functional Materials, Год журнала: 2023, Номер 33(40)

Опубликована: Июнь 4, 2023

Abstract Nowadays, it is still a great challenge to obtain high‐performance green‐solvent‐processed organic solar cells (OSCs). In this study, ternary blend strategy (one donor and two acceptors, 1D/2A) developed solve the difficulty of film morphology modulation during fabrication OSCs. A typical halogenated‐solvent processable binary system D18:BTP‐eC9‐4F selected as host, its green‐solvents‐processed devices show an inferior power conversion efficiency (PCE) ≈16%. SM16 with 3D shape persistent end groups third component due high fluorescence quantum yield, reduced intermolecular interaction, good solubility, moderate crystallinity. As result, display bicontinuous interpenetrating networks, energy loss, suppressed charge carrier recombination losses. Hence, excellent PCE 18.20% achieved for D18:BTP‐eC9‐4F:SM16 devices, which much higher than D18:BTP‐eC9‐4F‐based ones also one highest PCEs Besides, demonstrates universality other systems becomes effective pathway development green‐solvent

Язык: Английский

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In‐Situ Removable Solid Additive Optimizing Active Layer and Cathode Interlayer of Organic Solar Cells

Advanced Energy Materials, Год журнала: 2024, Номер 14(40)

Опубликована: Июль 21, 2024

Abstract In situ removable (ISR) solid additive can employ cold sublimation process to optimize active layer morphology for organic solar cells (OSCs), thus remaining unique potential. Herein, a feasible guideline is proposed discover new ISR 1‐bromo‐4‐chlorobenzene (CBB), whose removing time ( T R ) between those of reported additives 1,4‐dichlorobenzene (DCB) and 1‐chloro‐4‐iodobenzene (CIB). The CBB with moderate beneficial affording the optimal achieving highest power conversion efficiency (PCE) 18.58% D18:L8‐BO binary layer, as supported by most efficient exciton splitting, fastest transfer, balanced carrier transports. Due ability, DCB, CBB, CIB are further aggregation PDINN cathode interlayer. Particularly, CBB‐ CIB‐treated interlayers afforded based OSCs excellent PCEs 19.38% 19.26%, along remarkable fill factors 80.98% 81.37%, respectively. suppress non‐radiative recombination devices, resulting in higher open‐circuit voltage. This work not only provides an effective approach flourish but also expands application OSCs.

Язык: Английский

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Suppressing Exciton–Vibration Coupling via Intramolecular Noncovalent Interactions for Low‐Energy‐Loss Organic Solar Cells

Angewandte Chemie International Edition, Год журнала: 2024, Номер unknown

Опубликована: Дек. 3, 2024

Minimizing energy loss is crucial for breaking through the efficiency bottleneck of organic solar cells (OSCs). The main mechanism can be attributed to non-radiative recombination (ΔEnr) that occurs due exciton-vibration coupling. To tackle this challenge, tuning intramolecular noncovalent interactions strategically utilized tailor novel fused ring electron acceptors (FREAs). Upon comprehensive analysis both theoretical and experimental results, approach effectively enhance molecular rigidity, suppress structural relaxation, reduce exciton reorganization energy, weakens coupling strength. Consequently, binary OSC device based on Y-SeSe, which features dual strong Se ⋅ O interactions, achieves an outstanding power conversion (PCE) 19.49 %, accompanied by extremely small ΔEnr 0.184 eV, much lower than those Y-SS Y-SSe devices with weaker interactions. These achievements not only set record selenium-containing OSCs, but also mark lowest reported value among high-performance devices. Furthermore, ternary blend showcases a remarkable PCE 20.51 one highest PCEs single-junction OSCs. This work demonstrates effectiveness in suppressing coupling, thereby achieving low-energy-loss high-efficiency

Язык: Английский

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