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

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(13)

Published: Jan. 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.

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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Achieving Record-Efficiency Organic Solar Cells upon Tuning the Conformation of Solid Additives

Journal of the American Chemical Society, Journal Year: 2022, Volume and Issue: 144(32), P. 14731 - 14739

Published: July 20, 2022

Volatile solid additives (SADs) are considered as a simple yet effective approach to tune the film morphology for high-performance organic solar cells (OSCs). However, structural effects of SADs on photovoltaic performance still elusive. Herein, two volatilizable were designed and synthesized. One is SAD1 with twisted conformation, while other one planar SAD2 S···O noncovalent intramolecular interactions (NIIs). The theoretical experimental results revealed that smaller space occupation can more easily insert between Y6 molecules, which beneficial form tighter intermolecular packing mode after thermal treatment. As result, SAD2-treated OSCs exhibited less recombination loss, balanced charge mobility, higher hole transfer rate, favorable morphology, resulting in record power conversion efficiency (PCE) 18.85% (certified PCE: 18.7%) single-junction binary OSCs. universality this study shed light understanding conformation performances

Language: Английский

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Polythiophenes for organic solar cells with efficiency surpassing 17%

Joule, Journal Year: 2022, Volume and Issue: 6(3), P. 647 - 661

Published: March 1, 2022

Language: Английский

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Process‐Aid Solid Engineering Triggers Delicately Modulation of Y‐Series Non‐Fullerene Acceptor for Efficient Organic Solar Cells

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(20)

Published: March 22, 2022

Volatile solids with symmetric π-backbone are intensively implemented on manipulating the nanomorphology for improving operability and stability of organic solar cells. However, due to isotropic stacking, announced geometry cannot modify microscopic phase separation component distribution collaboratively, which will constrain promotion exciton splitting charge collection efficiency. Inspired by superiorities asymmetric configuration, a novel process-aid solid (PAS) engineering is proposed. By coupling BTP core unit in Y-series molecule, an asymmetric, volatile 1,3-dibromo-5-chlorobenzene can induce anisotropic dipole direction, elevated moment, interlaminar interaction spontaneously. Due synergetic effects favorable desired distribution, PAS-treated devices feature evident improvement splitting, transport, collection, accompanied suppressed trap-assisted recombination. Consequently, impressive fill factor 80.2% maximum power conversion efficiency (PCE) 18.5% device achieved. More strikingly, demonstrate promising thickness-tolerance character, where record PCE 17.0% yielded PAS 300 nm thickness photoactive layer, represents highest thick-film

Language: Английский

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Recent Progress of Y6‐Derived Asymmetric Fused Ring Electron Acceptors

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 32(35)

Published: July 5, 2022

Abstract Symmetric conjugated molecules can be broken through suitable synthetic strategies to construct novel asymmetric molecules, which largely broaden the material library. In field of organic solar cells, fused‐ring electron acceptors (FREAs) with A‐DA'D‐A type backbone structure have attracted much attention and enabled power conversion efficiencies (PCE) exceeding 18%. Among them, Y6 is one most classic FREAs that derive many symmetric exhibit unique optoelectronic properties. Thus, in this review, focus on recent progress Y6‐derived containing a dipyrrolobenzothiadiazole segment, classified as following three categories: end group, central core side chain. The relationship molecular structure, properties, device performance discussed detail. Finally, future design directions challenges faced by kind photovoltaic materials are given.

Language: Английский

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Enhancing Photon Utilization Efficiency for High‐Performance Organic Photovoltaic Cells via Regulating Phase‐Transition Kinetics

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(16)

Published: Jan. 30, 2023

Efficient photon utilization is key to achieving high-performance organic photovoltaic (OPV) cells. In this study, a multiscale fibril network morphology in PBQx-TCl:PBDB-TF:eC9-2Cl-based system constructed by regulating donor and acceptor phase-transition kinetics. The distinctive process crystal size are systematically investigated. PBQx-TCl eC9-2Cl form structures with diameters of ≈25 nm ternary films. Additionally, fine fibrils assembled PBDB-TF uniformly distributed over the networks eC9-2Cl. ideal enables achieve superior charge transfer transport processes compared binary systems; these improvements promote enhanced efficiency. Finally, high power conversion efficiency 19.51% single-junction OPV cell achieved. external quantum optimized exceeds 85% wide range 500-800 nm. A tandem also fabricated increase solar absorption. has an excellent PCE more than 20%. This study provides guidance for constructing improving

Language: Английский

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High-Efficiency Ternary Organic Solar Cells with a Good Figure-of-Merit Enabled by Two Low-Cost Donor Polymers

ACS Energy Letters, Journal Year: 2022, Volume and Issue: 7(8), P. 2547 - 2556

Published: July 13, 2022

Here, we combine two donor polymers with a relatively short synthesis method and fabricate ternary organic solar cells (OSCs) high efficiency decent figure-of-merit. A series of characterizations show that the optimal morphology blend is result coupling competition PTQ10 PTVT-T, where molecular packing phase separation motif broken but strong aggregation PTVT-T suppressed, resulting in efficient charge transport collection, as well suppressed bimolecular recombination. Moreover, previously reported solvent-vapor-assisted casting method, taken an understanding-guided optimization, pushes system's to 19.11%. Furthermore, PTVT-T-containing systems clearly better light soaking thermal stability than binary control system, benefiting from durable polymer matrix. Our work provides useful approach for developing efficient, stable, low-cost OSCs based on state-of-the-art donor/acceptor through design.

Language: Английский

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Lowing the energy loss of organic solar cells by molecular packing engineering via multiple molecular conjugation extension

Science China Chemistry, Journal Year: 2022, Volume and Issue: 65(7), P. 1362 - 1373

Published: May 6, 2022

Language: Английский

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In situandex situinvestigations on ternary strategy and co-solvent effects towards high-efficiency organic solar cells

Energy & Environmental Science, Journal Year: 2022, Volume and Issue: 15(6), P. 2479 - 2488

Published: Jan. 1, 2022

High efficiencies for organic solar cells are achieved. Two different morphology change paths revealed with both in situ and ex measurements.

Language: Английский

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