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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Intrinsic Role of Volatile Solid Additive in High‐Efficiency PM6:Y6 Series Nonfullerene Solar Cells

Advanced Materials, Год журнала: 2023, Номер 35(24)

Опубликована: Март 16, 2023

Organic nonfullerene solar cells (ONSCs) have made unprecedented progress; however, morphology optimization of ONSCs is proven to be particularly challenging relative classical fullerene-based devices. Here, a novel volatile solid additive (VSA), 2-hydroxy-4-methoxybenzophenone (2-HM), reported for achieving high-efficiency ONSCs. 2-HM functions as universal morphology-directing agent several well-known PM6:Y6 series blends, viz. PM6:Y6, PM6:BTP-eC9, PM6:L8-BO, leading best efficiency 18.85% at the forefront binary VSAs recently emerged, while intrinsic kinetics still unclear. Herein, set in situ and ex characterizations employed first illustrate molecule-aggregate-domain transition dynamic process assisted by VSA. More specifically, role individual donor PM6 acceptor Y6 systems unlocked, function altering bulk heterojunction blends further revealed enhanced photovoltaic performance. It believed that achievement brings not only deep insight into emerging additive, but also new hope improve molecular ordering, film microstructure, relevant performance

Язык: Английский

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Over 19.1% efficiency for sequentially spin-coated polymer solar cells by employing ternary strategy

Chemical Engineering Journal, Год журнала: 2023, Номер 471, С. 144711 - 144711

Опубликована: Июль 13, 2023

Язык: Английский

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BN‐Bond‐Embedded Triplet Terpolymers with Small Singlet–Triplet Energy Gaps for Suppressing Non‐Radiative Recombination and Improving Blend Morphology in Organic Solar Cells

Advanced Materials, Год журнала: 2023, Номер 35(17)

Опубликована: Фев. 3, 2023

Suppressing the photon energy loss (Eloss ), especially non-radiative loss, is of importance to further improve device performance organic solar cells (OSCs). However, typical π-conjugated semiconductors possess a large singlet-triplet gap (ΔEST leading lower triplet state than charge transfer and contributing channel photocurrent by state. Herein, series polymer donors are developed introducing BNIDT block into PM6 backbone. The high electron affinity opposite resonance effect BN bond in results lowered highest occupied molecular orbital (HOMO) largely reduced ΔEST . Moreover, morphology active blends also optimized fine-tuning content. Therefore, recombination via terminal channels traps effectively suppressed. PNB-3 (with 3% BNIDT):L8-BO exhibits both small morphology, favoring more efficient transport. Finally, simultaneously enhanced Voc 0.907 V, Jsc 26.59 mA cm-2 , FF 78.86% contribute champion PCE 19.02%. bonds benchmark polymers possible avenue toward higher-performance OSCs.

Язык: Английский

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Solid Additive‐Assisted Selective Optimization Strategy for Sequential Deposited Active Layers to Construct 19.16% Efficiency Binary Organic Solar Cells

Advanced Functional Materials, Год журнала: 2023, Номер 34(13)

Опубликована: Дек. 21, 2023

Abstract Volatile solid (VS)‐additives are regarded as an effective tool to manipulate morphology of sequential deposited (SD) active layers for improving power conversion efficiencies (PCEs) organic solar cells (OSCs), while the independent effect VS‐additives on donor and acceptor is often overlooked. Herein, a new VS‐additive named 2‐(2‐methoxyphenyl)benzo[ b ]thiophene (BTO) synthesized applied in SD binary PM6/L8‐BO layers. Introducing it into bottom PM6 layer (PM6 + ), BTO has low volatility longer volatilization distance, which prolongs interaction time between L8‐BO /L8‐BO film, leading over‐aggregated L8‐BO. While inserting top (L8‐BO fast evaporation excellent dipole help enhance molecular absorption, crystallinity, ordered packing system. Therefore, optimized with proper phase separation achieved increase exciton dissociation charge transfer properties, restrain recombination energy loss OSCs, yielding impressive PCE over 19%. Furtherly, using D18 instead PM6, SD‐systems offer record‐high 19.16%. The developed selective optimization strategy provides deep insight working mechanism boosting OSCs.

Язык: Английский

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Over 18.8% Efficiency of Layer‐By‐Layer Organic Photovoltaics Enabled by Ameliorating Exciton Utilization in Acceptor Layer

Advanced Functional Materials, Год журнала: 2024, Номер 34(16)

Опубликована: Янв. 2, 2024

Abstract The layer‐by‐layer (LbL) organic photovoltaics (OPVs) are constructed with wide‐bandgap donor PM1 and narrow‐bandgap acceptor L8‐BO. exciton utilization near cathode is still challenging considering restricted diffusion distance of excitons inability for transferring energy from L8‐BO to PM1. Herein, incorporation into layer (DIA) strategy employed improve cathode. efficiency LbL OPVs can be improved 18.02% 18.81% by incorporating 10 wt% layer, which closely associated efficient separation originated more adequate donor/acceptor interface faster charge transfer, as evidenced magneto‐photocurrent transient absorption results. in situ test morphological characterization clarify that molecular packing property benefited prolonged aggregation nucleation time assisted DIA strategy, contributing transport inhibited recombination active layers. thickness insensitive also induced indicated PCE retention value (82.2% vs. 74.0%) PM1/L8‐BO:PM1 PM1/L8‐BO when increased ≈180 nm. This work demonstrates the effectiveness improving tolerance OPVs.

Язык: Английский

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Molecular Packing and Dielectric Property Optimization through Peripheral Halogen Swapping Enables Binary Organic Solar Cells with an Efficiency of 18.77%

Advanced Functional Materials, Год журнала: 2023, Номер 33(31)

Опубликована: Апрель 17, 2023

Abstract Peripheral halogen regulations can endow non‐fullerene acceptors (NFAs) with enhanced features as organic semi‐conductors and further boost efficient solar cells (OSCs). Herein, based on a remarkable molecular platform of CH14 more than six halogenation positions, preferred NFA CH23 is constructed by synergetic swapping both central end units, rendering the overall enlarged dipole moment, packing density thus relative dielectric constant. Consequently, CH23‐based binary OSC reaches an excellent efficiency 18.77% due to its improved charge transfer/transport dynamics, much better that 17.81% for control CH14. This work demonstrates great potential achieving state‐of‐the‐art OSCs delicately regulating formula these newly explored CH‐series NFAs.

Язык: Английский

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Ultra Robust and Highly Efficient Flexible Organic Solar Cells with Over 18 % Efficiency Realized by Incorporating a Linker Dimerized Acceptor

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(41)

Опубликована: Авг. 24, 2023

The wearable application of flexible organic solar cells (f-OSCs) necessitates high power conversion efficiency (PCE) and mechanical robustness. However, photoactive films based on efficient non-fullerene small molecule acceptors (NF-SMAs) are typically brittle, leading to poor stability in devices. In this study, we achieved a remarkable PCE 18.06 % f-OSCs while maintaining ultrahigh robustness (with crack-onset strain (COS) higher than 11 %) by incorporating linker dimerized acceptor (DOY-TVT). Compared binary blends, ternary systems exhibit reduced non-radiative recombination, suppressed crystallization diffusion NF-SMAs, improved load distribution across the chain networks, enabling dissipation energy. Thus, developed study achieved, stability, surpassing OSCs. Moreover, retained 97 initial even after 3000 bending cycles, indicating excellent (9.1 systems). Furthermore, rigid device with inverted structure optimal active layer exhibited substantial increase retention, 89.6 865 h at 85 °C 93 more 1300 shelf storage 25 °C. These findings highlight potential oligomer for realizing high-performing

Язык: Английский

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Device Performance of Emerging Photovoltaic Materials (Version 4)

Advanced Energy Materials, Год журнала: 2023, Номер 14(4)

Опубликована: Дек. 15, 2023

Abstract Following the 3rd release of “Emerging PV reports” , best achievements in performance emerging photovoltaic (e‐PV) devices diverse e‐PV research subjects are summarized, as reported peer‐reviewed articles academic journals since August 2022. Updated graphs, tables, and analyses provided with several parameters, such power conversion efficiency, open‐circuit voltage, short‐circuit current density, fill factor, light utilization stability test energy yield. These parameters presented a function bandgap average visible transmittance for each technology application, put into perspective using, example, detailed balance efficiency limit. The 4th installment discusses “PV emergence” classification respect to generations” waves” highlights latest device progress multijunction flexible photovoltaics. Additionally, Dale‐Scarpulla's plots efficiency‐effort terms cumulative publication count also introduced.

Язык: Английский

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Over 19 % Efficiency Organic Solar Cells Enabled by Manipulating the Intermolecular Interactions through Side Chain Fluorine Functionalization

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(15)

Опубликована: Фев. 8, 2024

Fluorine side chain functionalization of non-fullerene acceptors (NFAs) represents an effective strategy for enhancing the performance organic solar cells (OSCs). However, a knowledge gap persists regarding relationship between structural changes induced by fluorine and resultant impact on device performance. In this work, varying amounts atoms were introduced into outer chains Y-series NFAs to construct two named BTP-F0 BTP-F5. Theoretical experimental investigations reveal that side-chain fluorination significantly increase overall average electrostatic potential (ESP) charge balance factor, thereby effectively improving ESP-induced intermolecular interaction, thus precisely tuning molecular packing bulk-heterojunction morphology. Therefore, BTP-F5-based OSC exhibited enhanced crystallinity, domain purity, reduced spacing, optimized phase distribution in vertical direction. This facilitates exciton diffusion, suppresses recombination, improves extraction. Consequently, promising power conversion efficiency (PCE) 17.3 % 19.2 achieved binary ternary devices, respectively, surpassing PCE 16.1 BTP-F0-based OSCs. work establishes structure-performance demonstrates is compelling achieving ideal separation highly efficient

Язык: Английский

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