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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Binary Organic Solar Cells Breaking 19% via Manipulating the Vertical Component Distribution

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(33)

Published: June 24, 2022

The variation of the vertical component distribution can significantly influence photovoltaic performance organic solar cells (OSCs), mainly due to its impact on exciton dissociation and charge-carrier transport recombination. Herein, binary devices are fabricated via sequential deposition (SD) D18 L8-BO materials in a two-step process. Upon independently regulating spin-coating speeds each layer deposition, optimal SD device shows record power conversion efficiency (PCE) 19.05% for single-junction OSCs, much higher than that corresponding blend casting (BC) (18.14%). Impressively, this strategy presents excellent universality boosting devices, exemplified by several nonfullerene acceptor systems. mechanism studies reveal with preferred components possesses high crystallinity, efficient splitting, low energy loss, balanced charge transport, resulting all-around enhancement performances. This work provides valuable approach high-efficiency shedding light understanding relationship between distribution.

Language: Английский

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

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(25)

Published: March 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.

Language: Английский

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Self‐Assembled Interlayer Enables High‐Performance Organic Photovoltaics with Power Conversion Efficiency Exceeding 20%

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(25)

Published: March 21, 2024

Interfacial layers (ILs) are prerequisites to form the selective charge transport for high-performance organic photovoltaics (OPVs) but mostly result in considerable parasitic absorption loss. Trimming ILs down a mono-molecular level via self-assembled monolayer is an effective strategy mitigate However, such suffers from inferior electrical contact with low surface coverage on rough surfaces and poor producibility. To address these issues, here, interlayer (SAI) developed, which involves thin layer of 2-6 nm full substrate both covalent van der Waals bonds by using molecule 2-(9H-carbazol-9-yl) (2PACz). Via facile spin coating without further rinsing annealing process, it not only optimizes optical properties OPVs, enables world-record efficiency 20.17% (19.79% certified) also simplifies tedious processing procedure. Moreover, SAI especially useful improving absorbing selectivity semi-transparent record light utilization 5.34%. This work provides optimize OPVs solar window applications.

Language: Английский

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

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(21)

Published: March 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.

Language: Английский

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A New Polymer Donor Enables Binary All‐Polymer Organic Photovoltaic Cells with 18% Efficiency and Excellent Mechanical Robustness

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(35)

Published: July 15, 2022

The development of polymerized small-molecule acceptors has boosted the power conversion efficiencies (PCEs) all-polymer organic photovoltaic (OPV) cells to 17%. However, polymer donors suitable for OPV are still lacking, restricting further improvement their PCEs. Herein, a new donor named PQM-Cl is designed and its performance explored. negative electrostatic potential low average local ionization energy distribution surface enable efficient charge generation transfer process. When blending with well-used acceptor, PY-IT, PQM-Cl-based devices deliver an impressive PCE 18.0% superior fill factor 80.7%, both which highest values cells. relevant measurements demonstrate that films possess excellent mechanical flexible properties. As such, fabricated 16.5% high stability displayed. These results candidate provide insights into design high-efficient

Language: Английский

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Fibrillization of Non‐Fullerene Acceptors Enables 19% Efficiency Pseudo‐Bulk Heterojunction Organic Solar Cells

Advanced Materials, Journal Year: 2022, Volume and Issue: 35(6)

Published: Nov. 24, 2022

The structural order and aggregation of non-fullerene acceptors (NFA) are critical toward light absorption, phase separation, charge transport properties their photovoltaic blends with electron donors, determine the power conversion efficiency (PCE) corresponding organic solar cells (OSCs). In this work, fibrillization small molecular NFA L8-BO assistance fused-ring solvent additive 1-fluoronaphthalene (FN) to substantially improve device PCE is demonstrated. Molecular dynamics simulations show that FN attaches backbone as bridge enhance intermolecular packing , inducing 1D self-assembly into fine fibrils a compact polycrystal structure. incorporated pseudo-bulk heterojunction (P-BHJ) active layer D18 donor, enhanced transport, collection properties, leading from 16.0% an unprecedented 19.0% in D18/L8-BO binary P-BHJ OSC, featuring high fill factor 80%. This work demonstrates strategy for fibrillating NFAs performance OSCs.

Language: Английский

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19.10% Efficiency and 80.5% Fill Factor Layer‐by‐Layer Organic Solar Cells Realized by 4‐Bis(2‐Thienyl)Pyrrole‐2,5‐Dione Based Polymer Additives for Inducing Vertical Segregation Morphology

Advanced Materials, Journal Year: 2022, Volume and Issue: 35(6)

Published: Nov. 22, 2022

The morphology plays a key role in determining the charge generation and collection process, thus impacting performances of organic solar cells (OSCs). limited selection pool additives to optimize OSCs, especially for emerging layer-by-layer (LbL) impeding improvements photovoltaic performances. Herein, new method using conjugated polymers as improving LbL-OSCs is reported. Four PH, PS, PF, PCl are developed with different side chains. These exhibit poor donor materials BHJ devices, due unsuitable energy level alignment unfavorable molecular interactions. By contrast, they can be served efficient PM6 fibril matrix facilitating penetration BTP-eC9 forming an intertwined D/A bicontinuous network vertical segregation. Such optimized by chain engineering, which enables progressive improvement separation collection. As result, adding small amount additive, contributes champion PCE 19.10% high FF 80.5%.

Language: Английский

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Benzo[d]thiazole Based Wide Bandgap Donor Polymers Enable 19.54% Efficiency Organic Solar Cells Along with Desirable Batch‐to‐Batch Reproducibility and General Applicability

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(21)

Published: March 4, 2023

Abstract The limited selection pool of high‐performance wide bandgap (WBG) polymer donors is a bottleneck problem the nonfullerene acceptor (NFA) based organic solar cells (OSCs) that impedes further improvement their photovoltaic performances. Herein, series new WBG polymers, namely PH‐BTz, PS‐BTz, PF‐BTz, and PCl‐BTz, are developed by using bicyclic difluoro‐benzo[d]thiazole (BTz) as block benzo[1,2‐b:4,5‐b′]dithiophene (BDT) derivatives donor units. By introducing S, F, Cl atoms to alkylthienyl sidechains on BDT, resulting polymers exhibit lowered energy levels enhanced aggregation properties. fluorinated PBTz‐F not only exhibits low‐lying HOMO level, but also has stronger face‐on packing order results in more uniform fibril‐like interpenetrating networks related PF‐BTz:L8‐BO blend. A high‐power conversion efficiency (PCE) 18.57% achieved. Moreover, good batch‐to‐batch reproducibility general applicability. In addition, ternary blend OSCs host PBTz‐F:L8‐BO PM6 guest PCE 19.54%, which among highest values OSCs.

Language: Английский

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Advantages, challenges and molecular design of different material types used in organic solar cells

Nature Reviews Materials, Journal Year: 2023, Volume and Issue: 9(1), P. 46 - 62

Published: Dec. 15, 2023

Language: Английский

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