Binary Organic Solar Cells Breaking 19% via Manipulating the Vertical Component Distribution

Advanced Materials, Год журнала: 2022, Номер 34(33)

Опубликована: Июнь 24, 2022

The variation of the vertical component distribution can significantly influence photovoltaic performance organic solar cells (OSCs), mainly due to its impact on exciton dissociation and charge-carrier transport recombination. Herein, binary devices are fabricated via sequential deposition (SD) D18 L8-BO materials in a two-step process. Upon independently regulating spin-coating speeds each layer deposition, optimal SD device shows record power conversion efficiency (PCE) 19.05% for single-junction OSCs, much higher than that corresponding blend casting (BC) (18.14%). Impressively, this strategy presents excellent universality boosting devices, exemplified by several nonfullerene acceptor systems. mechanism studies reveal with preferred components possesses high crystallinity, efficient splitting, low energy loss, balanced charge transport, resulting all-around enhancement performances. This work provides valuable approach high-efficiency shedding light understanding relationship between distribution.

Язык: Английский

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Y‐Type Non‐Fullerene Acceptors with Outer Branched Side Chains and Inner Cyclohexane Side Chains for 19.36% Efficiency Polymer Solar Cells

Advanced Materials, Год журнала: 2023, Номер 35(10)

Опубликована: Янв. 5, 2023

Abstract Raising the lowest unoccupied molecular orbital (LUMO) energy level of Y‐type non‐fullerene acceptors can increase open‐circuit voltage ( V oc ) and thus photovoltaic performance current top performing polymer solar cells (PSCs). One viable routes is demonstrated by successful Y6 derivative L8‐BO with branched alkyl chains at outer side. This will introduce steric hindrance reduce intermolecular aggregation, open up bandgap raise LUMO level. To take further advantages influence on optoelectronic properties derivatives, two BTP‐Cy‐4F BTP‐Cy‐4Cl are designed synthesized adopting side inner cyclohexane chains. An outstanding 0.937 achieved in D18:BTP‐Cy‐4F binary blend devices along a power conversion efficiency (PCE) 18.52%. With addition BTP‐eC9 to extend absorption spectral coverage, remarkable PCE 19.36% realized finally related ternary devices, which one highest values for single‐junction PSCs present. The results illustrate great potential constructing high‐performance their PSCs.

Язык: Английский

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Over 17.4% Efficiency of Layer‐by‐Layer All‐Polymer Solar Cells by Improving Exciton Utilization in Acceptor Layer

Advanced Functional Materials, Год журнала: 2023, Номер 33(28)

Опубликована: Март 27, 2023

Abstract Layer‐by‐layer all‐polymer solar cells (LbL all‐PSCs) are prepared with PM6 and PY‐IT by using sequential spin coating method. The exciton dissociation efficiency in acceptor layer near electrode is rather low due to the limited diffuse distance impossible energy transfer from narrow bandgap wide donor. In this study, less incorporated into enhance electrode. A power conversion (PCE) of 17.45% achieved LbL all‐PSCs incorporating 10 wt% layer, which much larger than 16.04% PCE PM6/PY‐IT‐based all‐PSCs. Over 8% enhancement can be realized attributed enhanced utilization layers confirmed quenched photoluminescence (PL) emission PY‐IT:PM6 films. Meanwhile, charge transport optimized PM6, as molecular arrangement. This study indicates that strategy donor has great potential fabricating efficient improving

Язык: Английский

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Hybrid Cycloalkyl‐Alkyl Chain‐Based Symmetric/Asymmetric Acceptors with Optimized Crystal Packing and Interfacial Exciton Properties for Efficient Organic Solar Cells

Advanced Science, Год журнала: 2023, Номер 10(7)

Опубликована: Янв. 2, 2023

Abstract Hybrid cycloalkyl‐alkyl side chains are considered a unique composite side‐chain system for the construction of novel organic semiconductor materials. However, there is lack fundamental understanding variations in single‐crystal structures as well optoelectronic and energetic properties generated by introduction hybrid electron acceptors. Herein, symmetric/asymmetric acceptors (Y‐C10ch A‐C10ch) bearing bilateral unilateral 10‐cyclohexyldecyl designed, synthesized, compared with symmetric acceptor 2,2′‐((2Z,2′Z)‐((12,13‐bis(2‐butyloctyl)‐3,9 bis(ethylhexyl)‐12,13‐dihydro‐[1,2,5]thiadiazolo[3,4‐e]thieno[2″,3″′:4′,5′]thieno[2′,3′:4,5] pyrrolo[3,2‐g]thieno[2′,3′:4,5]thieno[3,2‐b]indole‐2,10‐ diyl)bis(methanylylidene))bis(5,6‐difluoro‐3‐oxo‐2,3‐dihydro‐1H‐indene‐2,1‐diylidene))dimalononitrile (L8‐BO). The stepwise decreases optical bandgap, deepens energy level, enables molecules to pack closely regular manner. Crystallographic analysis demonstrates that chain endows more planar skeleton enforces compact 3D network packing, resulting an active layer higher domain purity. Moreover, affects donor/acceptor interfacial energetics accelerates exciton dissociation, enabling power conversion efficiency (PCE) >18% 2,2′‐((2Z,2′Z)‐((12,13‐bis(2‐ethylhexyl)‐3,9‐diundecyl12,13‐dihydro‐[1,2,5]thiadiazolo[3,4‐e]thieno[2″,3″′:4′,5′]thieno[2′,3′:4,5]pyrrolo[3,2‐g]thieno[2′,3′:4,5]thieno[3,2‐b]indole‐2,10‐diyl)bis(methanylylidene))bis(5,6‐difluoro‐3‐oxo‐2,3‐dihydro‐1H‐indene‐2,1‐diylidene))dimalononitrile (Y6) (PM6):A‐C10ch‐based solar cells (OSCs). Importantly, incorporation Y‐C10ch third component PM6:L8‐BO blend results PCE 19.1%. superior molecular packing behavior highlighted here fabrication high‐performance OSCs.

Язык: Английский

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1,5-Diiodocycloctane: a cyclane solvent additive that can extend the exciton diffusion length in thick film organic solar cells

Energy & Environmental Science, Год журнала: 2024, Номер 17(5), С. 1916 - 1930

Опубликована: Янв. 1, 2024

The addition of cyclane 1,5-diiodocycloctane (DICO) provides critical roles in extending exciton diffusion length within active layer, consequently contributing to the improvement power conversion. efficiency thick film organic solar cells.

Язык: Английский

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High‐Efficiency All‐Small‐Molecule Organic Solar Cells Based on New Molecule Donors with Conjugated Symmetric/Asymmetric Hybrid Cyclopentyl‐Hexyl Side Chains

Advanced Functional Materials, Год журнала: 2023, Номер 33(24)

Опубликована: Март 15, 2023

Abstract All small molecule organic solar cells (ASM‐OSCs) have numerous advantages but lower power conversion efficiencies (PCEs) than their polymer equivalents, which is largely due to the suboptimal nanoscale network structure in a bulk heterojunction (BHJ). Herein, new donors with symmetric/asymmetric hybrid cyclopentyl‐hexyl side chains are designed, accounting for manipulated intermolecular interactions and BHJ morphology. Theoretical experimental results reveal that asymmetric modification has significant influence on potential energy surface interaction can ensure preferable molecular assembly regulate D/A interfacial energetics, thus boosting exciton dissociation charge transport when pairing wide‐used acceptor L8‐BO. Concurrently, bicontinuous interpenetrating optimal domain size be fully evolved layer. As consequence, As‐TCp‐based binary device achieves superior PCE of 16.46% comparison controlled symmetric counterparts S‐BF (14.92%) A‐TCp (15.77%), ranks one best performance among ASM‐OSCs. This study demonstrates precise manipulation cyclo‐alkyl chain combination 2D strategy an effective synergistic approach control phase separation achieving high‐performance

Язык: Английский

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Efficient ternary organic photovoltaic device with a non-halogenated solvent via synergistic inhibiting charge recombination and regulating morphology

Journal of Materials Chemistry C, Год журнала: 2023, Номер 11(8), С. 2871 - 2879

Опубликована: Янв. 1, 2023

Ternary strategies are essential for the development of high-performance organic photovoltaic (OPV) devices. Similarly, green and environmentally friendly solvent processing in OPV devices is imperative commercial applications.

Язык: Английский

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Enhanced performance of inverted polymer solar cells by adding benzyl viologen dichloride into ZnO electron transport layer

Optical Materials, Год журнала: 2023, Номер 139, С. 113782 - 113782

Опубликована: Апрель 10, 2023

Язык: Английский

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Interface property–functionality interplay suppresses bimolecular recombination facilitating above 18% efficiency organic solar cells embracing simplistic fabrication

Energy & Environmental Science, Год журнала: 2023, Номер 16(8), С. 3416 - 3429

Опубликована: Янв. 1, 2023

The donor/acceptor interface properties play vital roles not only for singlet exciton dissociation but also to suppress the free charge recombination enabling state-of-the-art device fill factors (FFs).

Язык: Английский

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High Miscibility‐Induced Reduction of Trap Density in All‐Polymer Solar Cells Using Hybrid Cyclohexyl‐Hexyl Side Chains

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

Опубликована: Авг. 30, 2023

Abstract Reducing the trap density within organic solar cells is of vital importance to realize high power conversion efficiency (PCE); however, research focusing on this aspect limited in all‐polymer (All‐PSCs). In work, it found that can be dramatically reduced by simultaneously obtaining miscibility donor and acceptor ordered packing blend films through substituting ethylhexyl with hybrid cyclohexyl‐hexyl side chains design polymer donor. D18‐ChCl has a slightly lower aggregation behavior relative D18‐Cl counterpart, but reveals synchronously higher crystallinity PYF‐T‐o. Such morphology evolution positively affects electronic properties device—prolongs carrier lifetime, facilitates exciton dissociation, lowers energy disorder. As result, All‐PSC devices based exhibited remarkable PCE 17.1%, low 2.65 × 10 15 cm −3 , disorder 47 meV as well outstanding stability mechanical durability. This result demonstrates alkyl engineering delicately improves miscibility, drives density, refines device performance, which brings vibrancy field.

Язык: Английский

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