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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Single‐Junction Organic Solar Cells with 19.17% Efficiency Enabled by Introducing One Asymmetric Guest Acceptor

Advanced Materials, Год журнала: 2022, Номер 34(26)

Опубликована: Апрель 19, 2022

The ternary strategy has been widely identified as an effective approach to obtain high-efficiency organic solar cells (OSCs). However, for most OSCs, the nonradiative voltage loss lies between those of two binary devices, which limits further efficiency improvements. Herein, asymmetric guest acceptor BTP-2F2Cl is designed and incorporated into a PM1:L8-BO host blend. Compared with L8-BO neat film, L8-BO:BTP-2F2Cl blend film shows higher photoluminescence quantum yield larger exciton diffusion length. Introducing extends its absorption spectrum, improves molecular packing materials, suppresses charge recombination OSCs. Consequently, power conversion improved up 19.17% (certified value 18.7%), represents highest reported single-junction OSCs so far. results show that improving behaviors promising reducing realizing high-performance

Язык: Английский

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Layer‐by‐Layer Processed Ternary Organic Photovoltaics with Efficiency over 18%

Advanced Materials, Год журнала: 2021, Номер 33(12)

Опубликована: Фев. 18, 2021

Abstract Obtaining a finely tuned morphology of the active layer to facilitate both charge generation and extraction has long been goal in field organic photovoltaics (OPVs). Here, solution resolve above challenge via synergistically combining layer‐by‐layer (LbL) procedure ternary strategy is proposed demonstrated. By adding an asymmetric electron acceptor, BTP‐S2, with lower miscibility binary donor:acceptor host PM6:BO‐4Cl, vertical phase distribution can be formed donor‐enrichment at anode acceptor‐enrichment cathode OPV devices during LbL processing. In contrast, LbL‐type OPVs based on PM6:BO‐4Cl still show bulk‐heterojunction like morphology. The formation not only reduce recombination but also promote collection, thus enhancing photocurrent fill factor OPVs. Consequently, exhibit best efficiency 18.16% (certified: 17.8%), which among highest values reported date for work provides facile effective approach achieving high‐efficiency expected morphologies, demonstrates as being promising fabricating from present laboratory study future industrial production.

Язык: Английский

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Realizing 19.05% Efficiency Polymer Solar Cells by Progressively Improving Charge Extraction and Suppressing Charge Recombination

Advanced Materials, Год журнала: 2022, Номер 34(13)

Опубликована: Янв. 26, 2022

Improving charge extraction and suppressing recombination are critically important to minimize the loss of absorbed photons improve device performance polymer solar cells (PSCs). In this work, highly efficient PSCs demonstrated by progressively improving through combination side-chain engineering new nonfullerene acceptors (NFAs), adopting ternary blends, introducing volatilizable solid additives. The 2D side chains on BTP-Th induce a certain steric hindrance for molecular packing phase separation, which is mitigated fluorination BTP-FTh. Moreover, two crystalline molecules as second acceptor additive, respectively, into BTP-FTh-based host blend, crystallinity significantly improved blend morphology finely optimized. As expected, enhanced suppressed realized, contributing largely fill factor (FF) resultant devices. Accompanied open-circuit voltage (Voc ) short-circuit current density (Jsc ), record high power conversion efficiency (PCE) 19.05% realized finally.

Язык: Английский

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Manipulating the D:A interfacial energetics and intermolecular packing for 19.2% efficiency organic photovoltaics

Energy & Environmental Science, Год журнала: 2022, Номер 15(6), С. 2537 - 2544

Опубликована: Янв. 1, 2022

A novel electron acceptor, BTP-H2, demonstrates a high efficiency of 18.5% with V oc 0.932 V. It also enables the ternary device to yield an 19.2%, ranking highest among single-junction organic photovoltaics.

Язык: Английский

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Precisely Controlling the Position of Bromine on the End Group Enables Well‐Regular Polymer Acceptors for All‐Polymer Solar Cells with Efficiencies over 15%

Advanced Materials, Год журнала: 2020, Номер 32(48)

Опубликована: Окт. 29, 2020

Recent advances in the development of polymerized A-D-A-type small-molecule acceptors (SMAs) have promoted power conversion efficiency (PCE) all-polymer solar cells (all-PSCs) over 13%. However, monomer an SMA typically consists a mixture three isomers due to regio-isomeric brominated end groups (IC-Br(in) and IC-Br(out)). In this work, two isomeric are successfully separated, regioisomeric issue is solved, polymer acceptors, named PY-IT, PY-OT, PY-IOT, developed, where PY-IOT random terpolymer with same ratio acceptors. Interestingly, from absorption edge gradually redshifts electron mobility progressively increases. Theory calculation indicates that LUMOs distributed on entire molecular backbone contributing enhanced transport. Consequently, PM6:PY-IT system achieves excellent PCE 15.05%, significantly higher than those for PY-OT (10.04%) (12.12%). Morphological device characterization reveals highest PY-IT-based fruit absorption, more balanced charge transport, favorable morphology. This work demonstrates site polymerization SMAs strongly affects performance, offering insights into efficient all-PSCs.

Язык: Английский

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A guest-assisted molecular-organization approach for >17% efficiency organic solar cells using environmentally friendly solvents

Nature Energy, Год журнала: 2021, Номер 6(11), С. 1045 - 1053

Опубликована: Ноя. 1, 2021

Язык: Английский

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Desired open-circuit voltage increase enables efficiencies approaching 19% in symmetric-asymmetric molecule ternary organic photovoltaics

Joule, Год журнала: 2022, Номер 6(3), С. 662 - 675

Опубликована: Фев. 25, 2022

Язык: Английский

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High Efficiency (15.8%) All-Polymer Solar Cells Enabled by a Regioregular Narrow Bandgap Polymer Acceptor

Journal of the American Chemical Society, Год журнала: 2021, Номер 143(7), С. 2665 - 2670

Опубликована: Фев. 10, 2021

Despite the significant progresses made in all-polymer solar cells (all-PSCs) recently, relatively low short-circuit current density (Jsc) and large energy loss are still quite difficult to overcome for further development. To address these challenges, we developed a new class of narrow-bandgap polymer acceptors incorporating benzotriazole (BTz)-core fused-ring segment, named PZT series. Compared commonly used benzothiadiazole (BT)-containing PYT, less electron-deficient BTz renders derivatives with significantly red-shifted optical absorption up-shifted levels, leading simultaneously improved Jsc open-circuit voltage resultant all-PSCs. More importantly, regioregular (PZT-γ) has been achieve higher regiospecificity avoiding formation isomers during polymerization. Benefiting from more extended absorption, better backbone ordering, optimal blend morphology donor component, PZT-γ-based all-PSCs exhibit record-high power conversion efficiency 15.8% greatly enhanced 24.7 mA/cm2 0.51 eV.

Язык: Английский

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Compromising Charge Generation and Recombination of Organic Photovoltaics with Mixed Diluent Strategy for Certified 19.4% Efficiency

Advanced Materials, Год журнала: 2023, Номер 35(21)

Опубликована: Март 3, 2023

The ternary blend is demonstrated as an effective strategy to promote the device performance of organic photovoltaics (OPVs) due dilution effect. While compromise between charge generation and recombination remains a challenge. Here, mixed diluent for further improving efficiency OPV proposed. Specifically, high-performance system with polymer donor, i.e., PM6, nonfullerene acceptor (NFA), BTP-eC9, diluted by diluents, which involve high bandgap NFA BTP-S17 low BTP-S16 (similar that BTP-eC9). better miscibility BTP-eC9 can dramatically enhance open-circuit voltage (VOC ), while maximizes or short-circuit current density (JSC ). interplay BTP-17 enables recombination, thus leading 19.76% (certified 19.41%), best among single-junction OPVs. Further analysis on carrier dynamics validates efficacy diluents balancing be attributed more diverse energetic landscapes improved morphology. Therefore, this work provides commercialization.

Язык: Английский

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