Energy & Environmental Science, Journal Year: 2024, Volume and Issue: 17(18), P. 6799 - 6810
Published: Jan. 1, 2024
This work presents a novel charge migration strategy to efficiently engineer active layer morphology for PPHJ OSCs by firstly integrating SBC with NIL technique, which can improve transport/collection and phase separation behavior.
Language: Английский
Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)
Published: Oct. 9, 2023
Conjugated polymers are generally featured with low structural order due to their aromatic and irregular units, which limits light absorption charge mobility in organic solar cells. In this work, we report a conjugated molecule INMB-F that can act as molecular bridge via electrostatic force enhance the intermolecular stacking of BDT-based polymer donors toward efficient stable Molecular dynamics simulations synchrotron X-ray measurements reveal electronegative adsorb on electropositive main chain increase donor-donor interactions, leading enhanced shortened π-π distance consequently transport ability. Casting non-fullerene acceptor layer top modified donor fabricate cells layer-by-layer deposition evidences significant power conversion efficiency boosts range photovoltaic systems. A 19.4% (certified 18.96%) is realized PM6/L8-BO binary devices, one highest reported efficiencies material system. The by also leads six-fold enhancement operational stability
Language: Английский
Citations
101
Nano-Micro Letters, Journal Year: 2023, Volume and Issue: 15(1)
Published: Nov. 2, 2023
Abstract Power-conversion-efficiencies (PCEs) of organic solar cells (OSCs) in laboratory, normally processed by spin-coating technology with toxic halogenated solvents, have reached over 19%. However, there is usually a marked PCE drop when the blade-coating and/or green-solvents toward large-scale printing are used instead, which hampers practical development OSCs. Here, new series N -alkyl-tailored small molecule acceptors named YR-SeNF same molecular main backbone developed combining selenium-fused central-core and naphthalene-fused end-group. Thanks to -alkyl engineering, NIR-absorbing show different crystallinity, packing patterns, miscibility polymeric donor. The studies exhibit that packing, vertical distribution active layer morphologies well optimized introducing newly designed guest acceptor associated tailored chains, providing improved charge transfer dynamics stability for PM6:L8-BO:YR-SeNF-based As result, record-high approaching 19% achieved OSCs fabricated from green-solvent o -xylene high-boiling point. Notably, ternary offer robust operating under maximum-power-point tracking well-keep > 80% initial PCEs even 400 h. Our alkyl-tailored strategy provides unique approach develop high-efficiency stable OSCs, paves way industrial development.
Language: Английский
Citations
56
Nano-Micro Letters, Journal Year: 2023, Volume and Issue: 16(1)
Published: Nov. 23, 2023
Abstract With plenty of popular and effective ternary organic solar cells (OSCs) construction strategies proposed applied, its power conversion efficiencies (PCEs) have come to a new level over 19% in single-junction devices. However, previous studies are heavily based chloroform (CF) leaving behind substantial knowledge deficiencies understanding the influence solvent choice when introducing third component. Herein, we present case where newly designed asymmetric small molecular acceptor using fluoro-methoxylated end-group modification strategy, named BTP-BO-3FO with enlarged bandgap, brings different morphological evolution performance improvement effect on host system PM6:BTP-eC9, processed by CF ortho-xylene ( o -XY). detailed analyses supported series experiments, best PCE 19.24% for green solvent-processed OSCs is found be fruit finely tuned crystalline ordering general aggregation motif, which furthermore nourishes favorable charge generation recombination behavior. Likewise, can achieved replacing spin-coating blade coating active layer deposition. This work focuses commonly met yet frequently ignored issues building blends demonstrate cutting-edge device performance, hence, will instructive other OSC works future.
Language: Английский
Citations
56
Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(25), P. 13686 - 13695
Published: June 13, 2023
Low-bandgap materials have achieved rapid development and promoted the enhancement of power conversion efficiencies (PCEs) organic photovoltaic (OPV) cells. However, design wide-bandgap non-fullerene acceptors (WBG-NFAs), required by indoor applications tandem cells, has been lagging far behind OPV technologies. Here, we designed synthesized two NFAs named ITCC-Cl TIDC-Cl finely optimizing ITCC. In contrast with ITCC ITCC-Cl, can maintain a wider bandgap higher electrostatic potential simultaneously. When blending donor PB2, highest dielectric constant is also obtained in TIDC-Cl-based films, enabling efficient charge generation. Therefore, PB2:TIDC-Cl-based cell possessed high PCE 13.8% an excellent fill factor (FF) 78.2% under air mass 1.5G (AM 1.5G) condition. Furthermore, exciting 27.1% be accomplished PB2:TIDC-Cl system illumination 500 lux (2700 K light-emitting diode). Combined theoretical simulation, based on was fabricated exhibited 20.0%.
Language: Английский
Citations
46
Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(14)
Published: Feb. 9, 2024
Abstract Achieving both high power conversion efficiency (PCE) and device stability is a major challenge for the practical development of organic solar cells (OSCs). Herein, three non‐fully conjugated dimerized giant acceptors (named 2Y‐sites, including wing‐site‐linked 2Y‐wing, core‐site‐linked 2Y‐core, end‐site‐linked 2Y‐end) are developed. They share similar monomer precursors but have different alkyl‐linked sites, offering fine‐tuned molecular absorption, packing, glass transition temperature, carrier mobility. Among their binary active layers, D18/2Y‐wing has better miscibility, leading to optimized morphology more efficient charge transfer compared D18/2Y‐core D18/2Y‐end. Therefore, D18/2Y‐wing‐based OSCs achieve superior PCE 17.73 %, attributed enhanced photocurrent fill factor. Furthermore, exhibit balance improved stability, distinguishing them within 2Y‐sites. Building on success 2Y‐wing in systems, we extend its application ternary by pairing it with near‐infrared absorbing D18/BS3TSe‐4F host. Thanks complementary absorption 300–970 nm further morphology, obtain higher 19.13 setting new benchmark dimer‐derived OSCs. This approach site engineering constructing presents promising pathway improve
Language: Английский
Citations
42
Advanced Science, Journal Year: 2024, Volume and Issue: 11(23)
Published: April 3, 2024
Abstract In this study, a novel wide‐bandgap small molecule guest material, ITOA, designed and synthesized for fabricating efficient ternary organic solar cells (OSCs) ITOA complements the absorbance of PM6:Y6 binary system, exhibiting strong crystallinity modest miscibility. optimizes morphology by promoting intensive molecular packing, reducing domain size, establishing preferred vertical phase distribution. These features contribute to improved well‐balanced charge transport, suppressed carrier recombination, exciton dissociation. Consequently, significantly enhanced efficiency 18.62% device is achieved, accompanied increased short‐circuit current density ( J SC ), fill factor (FF), open‐circuit voltage V OC ). Building on success, replacing Y6 with BTP‐eC9 leads an outstanding PCE 19.33% OSCs. Notably, introduction expedites formation optimized morphology, resulting in impressive 18.04% without any postprocessing. Moreover, exhibits operational stability under maximum power point (MPP) tracking. This comprehensive study demonstrates that rationally can optimize reduce energy loss, streamline fabrication process, essential achieving high OSCs, paving way practical commercial applications.
Language: Английский
Citations
36
Advanced Materials, Journal Year: 2024, Volume and Issue: 36(18)
Published: Jan. 27, 2024
Abstract Although a suitable vertical phase separation (VPS) morphology is essential for improving charge transport efficiency, reducing recombination, and ultimately boosting the efficiency of organic solar cells (OSCs), there lack theoretical guidance on how to achieve ideal morphology. Herein, relationship between molecular structure VPS pseudo‐planar heterojunction (PPHJ) OSCs established by using surface electrostatic potential (ESP) as bridge. The morphological evolution mechanism revealed studying four binary systems with vary difference (∆ESP) donors (Ds) acceptors (As). findings manifest that ∆ESP increases, active layer more likely form well‐mixed phase, while smaller favors Interestingly, it also observed larger leads enhanced miscibility Ds As, resulting in higher non‐radiative energy losses (ΔE 3 ). Based these discoveries, ternary PPHJ device meticulously designed an appropriate obtain better lower ΔE , impressive 19.09% achieved. This work demonstrates optimizing ΔESP, not only formation can be controlled, but reduced, paving way further boost OSC performance.
Language: Английский
Citations
34
Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(22)
Published: March 8, 2024
Abstract Herein, two emerging device optimization methods, solid additive and layer‐by‐layer (LBL) process, for organic solar cells (OSCs) are simultaneously studied. Through traditional blend cast recently proposed identical solvent LBL cast, BDCB (2‐monobromo‐1,3‐dichloro‐bezene), a benzene derivative, is used to improve the performance based on celebrity combination PM6:L8‐BO. The results reveal that finely optimized concentration in PM6 solution can push efficiency of 19.03% compared with only 18.12% while power conversion (PCE) changing trend determined by BDCB's ratio L8‐BO's precursor. morphology characterizations confirm there exists no significant stratification LBL‐processed devices, supported previously reported swelling‐intercalation‐phase separation (SIPS) model. Thereby, additive's 2D considered smart strategy tuning SIPS which various final states. This work not reports cutting‐edge binary OSCs, but also new insight deep understanding method‐based development.
Language: Английский
Citations
32
Advanced Materials, Journal Year: 2024, Volume and Issue: 36(26)
Published: March 28, 2024
Abstract Restricted by the energy‐gap law, state‐of‐the‐art organic solar cells (OSCs) exhibit relatively low open‐circuit voltage ( V OC ) because of large nonradiative energy losses (Δ E nonrad ). Moreover, trade‐off between and external quantum efficiency (EQE) OSCs is more distinctive; power conversion efficiencies (PCEs) are still <15% with s >1.0 V. Herein, electronic properties aggregation behaviors non‐fullerene acceptors (NFAs) carefully considered then a new NFA (Z19) delicately designed simultaneously introducing alkoxy phenyl‐substituted alkyl chains to conjugated backbone. Z19 exhibits hypochromatic‐shifted absorption spectrum, high‐lying lowest unoccupied molecular orbital level ordered 2D packing mode. The D18:Z19‐based blend film favorable phase separation face‐on dominated orientation, facilitating charge transport properties. Consequently, D18:Z19 binary devices afford an exciting PCE 19.2% high 1.002 V, surpassing Y6‐2O‐based devices. former highest reported date for Δ Z19‐ (0.200 eV) (0.155 lower than that Y6‐based (0.239 Indications design such NFA, considering could promote breakthrough in OSCs.
Language: Английский
Citations
27
ACS Materials Letters, Journal Year: 2024, Volume and Issue: 6(7), P. 2964 - 2973
Published: June 12, 2024
Layer-by-layer (LbL) all-polymer solar cells (APSCs) are constructed with or without the incorporation of a Pt complex F-Pt as an energy donor additive in acceptor layer. The power conversion efficiency (PCE) LbL APSCs can be enhanced from 15.86% to 17.14% through introducing 0.2 wt % PY-IT layer, originating efficient transfer PM6 and PY-IT. well confirmed spectral overlapping between photoluminescence (PL) spectra absorption PY-IT, prolonged PL lifetime according transient time-resolved blend films. universality strategy further PBQx-TCl/PY-DT based APSCs, PCE increased 17.57% 18.29% by incorporating into PY-DT
Language: Английский
Citations
26