Renewed Prospects for Organic Photovoltaics

Chemical Reviews, Год журнала: 2022, Номер 122(18), С. 14180 - 14274

Опубликована: Авг. 5, 2022

Organic photovoltaics (OPVs) have progressed steadily through three stages of photoactive materials development: (i) use poly(3-hexylthiophene) and fullerene-based acceptors (FAs) for optimizing bulk heterojunctions; (ii) development new donors to better match with FAs; (iii) non-fullerene (NFAs). The application NFAs an A–D–A configuration (where A = acceptor D donor) has enabled devices efficient charge generation small energy losses (Eloss < 0.6 eV), resulting in substantially higher power conversion efficiencies (PCEs) than FA-based devices. discovery Y6-type (Y6 2,2′-((2Z,2′Z)-((12,13-bis(2-ethylhexyl)-3,9-diundecyl-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) A–DA′ D–A further propelled the PCEs go beyond 15% due smaller Eloss values (∼0.5 eV) external quantum efficiencies. Subsequently, Y6-series single-junction increased >19% may soon approach 20%. This review provides update recent progress OPV following aspects: developments novel donors, understanding structure–property relationships underlying mechanisms state-of-the-art OPVs, tasks underpinning commercialization such as device stability, module development, potential applications, high-throughput manufacturing. Finally, outlook prospects section summarizes remaining challenges technology.

Язык: Английский

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Recent progress in organic solar cells (Part I material science)

Science China Chemistry, Год журнала: 2021, Номер 65(2), С. 224 - 268

Опубликована: Дек. 27, 2021

Язык: Английский

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Binary Organic Solar Cells with 19.2% Efficiency Enabled by Solid Additive

Advanced Materials, Год журнала: 2023, Номер 35(25)

Опубликована: Март 25, 2023

Morphology optimization is critical for achieving high efficiency and stable bulk-heterojunction (BHJ) organic solar cells (OSCs). Herein, the use of 3,5-dichlorobromobenzene (DCBB) with volatility low cost to manipulate evolution BHJ morphology improve operability photostability OSCs proposed. Systematic simulations reveal charge distribution DCBB its non-covalent interaction active layer materials. The addition can effectively tune aggregation PBQx-TF:eC9-2Cl during film formation, resulting in a favorable phase separation reinforced molecular packing. As result, power conversion 19.2% (certified as 19.0% by National Institute Metrology) DCBB-processed PBQx-TF:eC9-2Cl-based OSCs, which highest reported value binary obtained. Importantly, devices exhibit superior have thus considerable application potential printing large-area devices, demonstrating outstanding universality various systems. study provides facile approach control enhances photovoltaic performance OSCs.

Язык: Английский

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A Tandem Organic Photovoltaic Cell with 19.6% Efficiency Enabled by Light Distribution Control

Advanced Materials, Год журнала: 2021, Номер 33(39)

Опубликована: Авг. 8, 2021

Abstract Despite more potential in realizing higher photovoltaic performance, the highest power conversion efficiency (PCE) of tandem organic (OPV) cells still lags behind that state‐of‐the‐art single‐junction cells. In this work, highly efficient double‐junction OPV are fabricated by optimizing photoactive layers with low voltage losses and developing an effective method to tune optical field distribution. The studied structured as indium tin oxide (ITO)/ZnO/bottom layer/interconnecting layer (ICL)/top layer/MoO x /Ag, where bottom top based on blends PBDB‐TF:ITCC PBDB‐TF:BTP‐eC11, respectively, ICL refers interconnecting MoO /Ag/ZnO:PFN‐Br. As these results indicate there is not much room for layer, effort put into fine‐tuning layer. By rationally modulating composition thickness PBDB‐TF:BTP‐eC11 blend films, 300 nm‐thick film 1:2 D/A ratio found be ideal sub‐cell terms characteristics light distribution control. For optimized cell, a PCE 19.64% realized, which result certified 19.50% National Institute Metrology.

Язык: Английский

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A Quinoxaline‐Based D–A Copolymer Donor Achieving 17.62% Efficiency of Organic Solar Cells

Advanced Materials, Год журнала: 2021, Номер 33(23)

Опубликована: Апрель 29, 2021

Abstract Side‐chain engineering has been an effective strategy in tuning electronic energy levels, intermolecular interaction, and aggregation morphology of organic photovoltaic materials, which is very important for improving the power conversion efficiency (PCE) solar cells (OSCs). In this work, two D–A copolymers, PBQ5 PBQ6, are designed synthesized based on bithienyl‐benzodithiophene (BDTT) as donor (D) unit, difluoroquinoxaline (DFQ) with different side chains acceptor (A) thiophene π‐bridges. PBQ6 alkyl‐substituted fluorothiophene DFQ units possesses redshifted absorption, stronger higher hole mobility than alkyl units. The blend film Y6 shows balanced hole/electron mobilities, less charge carrier recombination, more favorable morphology. Therefore, OSC PBQ6:Y6 achieves a PCE high 17.62% fill factor 77.91%, significantly (15.55%) PBQ5:Y6‐based OSC. by far one highest efficiencies binary OSCs polymer acceptor.

Язык: Английский

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Small Exciton Binding Energies Enabling Direct Charge Photogeneration Towards Low‐Driving‐Force Organic Solar Cells

Angewandte Chemie International Edition, Год журнала: 2021, Номер 60(28), С. 15348 - 15353

Опубликована: Май 4, 2021

Abstract Organic solar cells (OSCs) with nonfullerene acceptors (NFAs) exhibit efficient charge generation under small interfacial energy offsets, leading to over 18 % efficiency for the single‐junction devices based on state‐of‐the‐art NFA of Y6. Herein, reveal underlying mechanisms, we have investigated exciton binding ( E b ) in Y6 by a joint theoretical and experimental study. The results show that owing strong polarization effects, has remarkable −0.11–0.15 eV, which is even lower than perovskites many cases. Moreover, it peculiar photoluminescence enhanced temperature, barrier separating excitons into charges evidently thermal according temperature dependence photoluminescence, manifesting direct photogeneration carriers enabled weak Thus, NFA‐based OSCs shows little driving forces.

Язык: Английский

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Regio‐Regular Polymer Acceptors Enabled by Determined Fluorination on End Groups for All‐Polymer Solar Cells with 15.2 % Efficiency

Angewandte Chemie International Edition, Год журнала: 2021, Номер 60(18), С. 10137 - 10146

Опубликована: Янв. 27, 2021

Abstract Polymerization sites of small molecule acceptors (SMAs) play vital roles in determining device performance all‐polymer solar cells (all‐PSCs). Different from our recent work about fluoro‐ and bromo‐ co‐modified end group IC‐FBr (a mixture IC‐FBr1 IC‐FBr2), this paper, we synthesized purified two regiospecific substituted groups (IC‐FBr‐ o & IC‐FBr‐ m ), which were then employed to construct regio‐regular polymer named PYF‐T‐ , respectively . In comparison with its isomeric counterparts different conjugated coupling sites, exhibits stronger bathochromic absorption achieve better photon harvesting. Meanwhile, adopts more ordered inter‐chain packing suitable phase separation after blending the donor PM6, resulted suppressed charge recombination efficient transport. Strikingly, observed a dramatic difference between While devices based on PM6:PYF‐T‐ can yield power conversion efficiency (PCE) 15.2 %, only show poor efficiencies 1.4 %. This demonstrates success configuration‐unique fluorinated designing high‐performance regular acceptors, provides guidelines towards developing all‐PSCs efficiencies.

Язык: Английский

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Recent advances in PM6:Y6-based organic solar cells

Materials Chemistry Frontiers, Год журнала: 2021, Номер 5(8), С. 3257 - 3280

Опубликована: Янв. 1, 2021

This review provides a detailed overview of PM6:Y6-based organic solar cells (OSCs), including the underlying mechanisms, terpolymers derived from PM6, ternary or quaternary OSCs, interfacial engineering and electrode progress.

Язык: Английский

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Understanding, quantifying, and controlling the molecular ordering of semiconducting polymers: from novices to experts and amorphous to perfect crystals

Materials Horizons, Год журнала: 2021, Номер 9(2), С. 577 - 606

Опубликована: Дек. 1, 2021

Molecular packing of semiconducting polymers is often critical to the performance devices using these materials. The degree and quality ordering are revealed by grazing-incidence wide-angle X-ray scattering thermal analysis.

Язык: Английский

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A Synergistic Strategy of Manipulating the Number of Selenophene Units and Dissymmetric Central Core of Small Molecular Acceptors Enables Polymer Solar Cells with 17.5 % Efficiency

Angewandte Chemie International Edition, Год журнала: 2021, Номер 60(35), С. 19241 - 19252

Опубликована: Июнь 3, 2021

Abstract A dissymmetric backbone and selenophene substitution on the central core was used for synthesis of symmetric or A‐DA′D‐A type non‐fullerene small molecular acceptors (NF‐SMAs) with different numbers selenophene. From S‐YSS‐Cl to A‐WSSe‐Cl S‐WSeSe‐Cl , a gradually red‐shifted absorption larger electron mobility crystallinity in neat thin film observed. exhibit stronger tighter intermolecular π–π stacking interactions, extra S⋅⋅⋅N non‐covalent interactions from benzothiadiazole, better ordered 3D interpenetrating charge‐transfer networks comparison thiophene‐based . The ‐based device has PCE 17.51 %, which is highest value selenophene‐based NF‐SMAs binary polymer solar cells. combination precise replacement effective improve J sc FF without sacrificing V oc

Язык: Английский

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