Renewed Prospects for Organic Photovoltaics

Chemical Reviews, Journal Year: 2022, Volume and Issue: 122(18), P. 14180 - 14274

Published: Aug. 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.

Language: Английский

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

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(26)

Published: April 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

Language: Английский

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Selenium Heterocyclic Electron Acceptor with Small Urbach Energy for As-Cast High-Performance Organic Solar Cells

Journal of the American Chemical Society, Journal Year: 2020, Volume and Issue: 142(44), P. 18741 - 18745

Published: Oct. 21, 2020

Typical organic photovoltaic materials show high Urbach energies (ca. 25–50 meV), which is considerably higher than those of their inorganic counterparts and limits further improvement in the device efficiency solar cells (OSCs). In this study, we introduce a facile method selenium substitution to reduce energy 20.4 meV (Y6Se), lowest value reported for high-performance very close 15 meV) typical inorganic/hybrid semiconductors, such as crystalline silicon, gallium nitride, lead-halide perovskite. Next, OSCs based on Y6Se showed 17.7% efficiency, among best results record as-cast single junction date.

Language: Английский

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Crystallography, Morphology, Electronic Structure, and Transport in Non-Fullerene/Non-Indacenodithienothiophene Polymer:Y6 Solar Cells

Journal of the American Chemical Society, Journal Year: 2020, Volume and Issue: 142(34), P. 14532 - 14547

Published: July 23, 2020

Emerging nonfullerene acceptors (NFAs) with crystalline domains enable high-performance bulk heterojunction (BHJ) solar cells. Thermal annealing is known to enhance the BHJ photoactive layer morphology and performance. However, microscopic mechanism of annealing-induced performance enhancement poorly understood in emerging NFAs, especially regarding competing factors. Here, optimized thermal model system PBDB-TF:Y6 (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) decreases open circuit voltage (VOC) but increases short current (JSC) fill factor (FF) such that resulting power conversion efficiency (PCE) from 14 15% ambient environment. Here we systematically investigate these effects through in-depth characterizations carrier mobility, film morphology, charge photogeneration, recombination using SCLC, GIXRD, AFM, XPS, NEXAFS, R-SoXS, TEM, STEM, fs/ns TA spectroscopy, 2DES, impedance spectroscopy. Surprisingly, does not alter crystallinity, R-SoXS characteristic size scale, relative average phase purity, or TEM-imaged separation rather facilitates Y6 migration top surface, changes PBDB-TF/Y6 vertical intermixing, reduces bottom surface roughness. While increase bimolecular (BR) lower free (FC) yield, they also electron hole mobility by at least 2-fold. Importantly, increased μh dominates underlies FF PCE. Single-crystal X-ray diffraction reveals molecules cofacially pack via their end groups/cores, shortest π-π distance as close 3.34 Å, clarifying out-of-plane π-face-on molecular orientation nanocrystalline domains. DFT analysis crystals hole/electron reorganization energies low 160/150 meV, large intermolecular electronic coupling integrals 12.1-37.9 meV rationalizing 3D transport, relatively high μe 10-4 cm2 V-1 s-1. Taken together, this work clarifies richness high-efficiency NFA cells tasks for future materials design.

Language: Английский

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A-DA′D-A non-fullerene acceptors for high-performance organic solar cells

Science China Chemistry, Journal Year: 2020, Volume and Issue: 63(10), P. 1352 - 1366

Published: July 17, 2020

Language: Английский

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Eco-Friendly Polymer Solar Cells: Advances in Green-Solvent Processing and Material Design

ACS Nano, Journal Year: 2020, Volume and Issue: 14(11), P. 14493 - 14527

Published: Oct. 26, 2020

Despite the recent breakthroughs of polymer solar cells (PSCs) exhibiting a power conversion efficiency over 17%, toxic and hazardous organic solvents such as chloroform chlorobenzene are still commonly used in their fabrication, which impedes practical application PSCs. Thus, development eco-friendly processing methods suitable for industrial-scale production is now considered an imperative research focus. This Review provides roadmap design efficient photoactive materials that compatible with non-halogenated green (e.g., xylenes, toluene, tetrahydrofuran). We summarize to match non-fullerene cells. further review progress use more (i.e., water or alcohol) achieving truly sustainable PSC fabrication. For example, concept water- alcohol-dispersed nanoparticles made conjugated introduced. Also, important strategies develop water/alcohol-soluble completely eliminate conventional discussed. Finally, we provide our perspectives on challenges facing current materials, large-area coating techniques long-term stability. believe this will inform PSCs clean renewable energy sources.

Language: Английский

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Fine-tuning of side-chain orientations on nonfullerene acceptors enables organic solar cells with 17.7% efficiency

Energy & Environmental Science, Journal Year: 2021, Volume and Issue: 14(6), P. 3469 - 3479

Published: Jan. 1, 2021

Regulating side-chain orientations of Y-series NFAs is a promising strategy to achieve favorable morphology, and high charge mobility solar cell performances, which enables high-performance devices with efficiency approaching 18%.

Language: Английский

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Balancing the efficiency, stability, and cost potential for organic solar cells via a new figure of merit

Joule, Journal Year: 2021, Volume and Issue: 5(5), P. 1209 - 1230

Published: April 21, 2021

Language: Английский

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Highly efficient non-fullerene organic solar cells enabled by a delayed processing method using a non-halogenated solvent

Energy & Environmental Science, Journal Year: 2020, Volume and Issue: 13(11), P. 4381 - 4388

Published: Jan. 1, 2020

A delayed processing method is demonstrated successfully to optimize the morphology of PM6:BTP-BO-4Cl, boosting PCE up 17.33%.

Language: Английский

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Optimized Active Layer Morphologies via Ternary Copolymerization of Polymer Donors for 17.6 % Efficiency Organic Solar Cells with Enhanced Fill Factor

Angewandte Chemie International Edition, Journal Year: 2020, Volume and Issue: 60(5), P. 2322 - 2329

Published: Oct. 15, 2020

Abstract Regulating molecular structure to optimize the active layer morphology is of considerable significance for improving power conversion efficiencies (PCEs) in organic solar cells (OSCs). Herein, we demonstrated a simple ternary copolymerization approach develop terpolymer donor PM6‐Tz20 by incorporating 5,5′‐dithienyl‐2,2′‐bithiazole (DTBTz, 20 mol%) unit into backbone PM6 (PM6‐Tz00). This method can effectively tailor orientation and aggregation polymer, then corresponding physical processes devices, ultimately boosting FF PCE. Hence, PM6‐Tz20: Y6‐based OSCs achieved PCE up 17.1% with significantly enhanced 0.77. Using Ag (220 nm) instead Al (100 as cathode, champion was further improved 17.6%. work provides effective design strategy photovoltaic performance.

Language: Английский

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