Over 19.2% Efficiency of Layer‐By‐Layer Organic Photovoltaics by Ameliorating Exciton Dissociation and Charge Transport

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 26, 2025

Abstract Layer‐by‐layer (LbL) organic photovoltaics (OPVs) are fabricated with polymer PM1 as donor and small molecule L8‐BO acceptor by employing sequential spin‐coating technology. The BTP‐eC9 PTAA deliberately selected for individually incorporating into layer layer, resulting in the power conversion efficiency (PCE) increased from 18.22% to 19.23%. improvement of performance is attributed synergistically short circuit current density ( J SC ) 27.78 mA cm −2 fill factor (FF) 78.23%. introduction can promote photogenerated exciton dissociation, especially excitons near anode. Meanwhile, molecular crystallinity also enhanced appropriate layer. incorporation provide hole transport channels effectively improve holes generated self‐dissociation L8‐BO, FFs 77.40% synergistic effects layers result a 19.23% PCE optimized LbL‐OPVs. This work demonstrates that there great room hierarchically optimize achieving highly efficient

Language: Английский

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Layered All‐Polymer Solar Cells with Efficiency of 18.34% by Employing Alloyed Polymer Donors

Small, Journal Year: 2025, Volume and Issue: 21(11)

Published: Feb. 7, 2025

Abstract A series of layered all‐polymer solar cells (LA‐PSCs) with the normal or inverted structure are prepared by employing a sequential spin‐coating method PBQx‐TCl, PM1 as polymer donor, and PY‐DT acceptor. The power conversion efficiency (PCE) LA‐PSCs can be improved from 17.20% to 18.34% incorporating 30 wt.% into PBQx‐TCl layer, resulting simultaneously increased J SC 25.35 mA cm −2 , V OC 0.971 FF 74.49%. PCE improvement also achieved PBQx‐TCl:PM1 donor layers. mixed prefer form alloyed states in LA‐PSCs, which confirmed gradually s more content Meanwhile, photogenerated excitons layers dissociated at interface between PM1, especially for located near ITO electrode. exciton dissociation provide an additional channel improving utilization efficiency, positive external quantum spectral difference (∆EQE) values Over 6.6% realized using layer.

Language: Английский

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Emergence of Low-Cost and High-Performance Nonfused Ring Electron Acceptors

Accounts of Chemical Research, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 20, 2024

ConspectusOrganic solar cells (OSCs) have garnered significant attention in academic and industrial circles due to their advantages such as lightweight, excellent bending performance, the ability be fabricated into semitransparent devices. Since proposal of bulk heterojunction concept by Heeger et al. 1995, conjugated polymer/fullerene pairs gradually emerged optimal choice for active layer materials OSCs. Fullerene derivatives were preferred electron acceptors OSCs because high mobility. However, limitations insufficient light absorption, limited derivative potential, poor energy level tunability, power conversion efficiency (PCE) based on fullerene has encountered a bottleneck approximately 12%, despite continuous updates polymer donor over nearly two decades development, leading gradual decline importance. By contrast, nonfullerene (NFAs) gained dominance this field since first appearing 2015, thanks tunable absorption spectrum, adjustable levels, modifiable chemical structure. Among acceptors, fused-ring (FREAs) ITIC Y6 achieved progress, boosting PCE 20%. This milestone achievement indicates potential commercial applications. synthesis process FREA is complex often constrained low-yield ring-closure reactions, resulting costs.The molecular backbone nonfused ring (NFREAs) composed single bonds, which enables adoption modular mainly via Stille (based organotin reactant) and/or Suzuki organoboron coupling or C–H activation (without prefunctionalization) avoids ring-closing thus making them alternative acceptors. To achieve planar minimize loss conformational rotation, our team innovatively used intramolecular noncovalent interactions replacement traditional covalent bonds. Furthermore, address issues solubility excessive aggregation during film formation NFREAs, we strategically introduced sterically hindered side groups, 2,6-bis(alkyloxy)phenyl diphenylamino, design, effectively mitigating these problems. These innovative design concepts significantly advanced development high-performance NFREAs increasing from research community. The PCEs improved less than 10% close 20% initial discovery. optimizing device fabrication process, 19%, comparable that FREAs. article will delve evolution latest progress aiming provide valuable insights guidance cost-effective NFREA materials.

Language: Английский

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Theoretical Investigation of Polarization-Sensitive Photoresponse in the Donor–Acceptor Interface of Organic Photovoltaic Devices

The Journal of Physical Chemistry C, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 14, 2025

Understanding the photoelectric conversion process is of great significance for design and preparation organic photovoltaic devices. In this work, we investigated intermolecular intramolecular processes charge transfer characteristics donor (D) acceptor (A) materials at molecular level by using simulation methods. The nonequilibrium Green's function method used to calculate photocurrents excited incident photons with different polarization directions. results show that are optical anisotropy, maximum responsivity appears along specific direction depends on photon energy. polarization-sensitive attributed anisotropic distribution photogenerated electrons holes. Moreover, integrated decrease exponentially increase in π–π stacking distance. However, photoexcitation energy, such as 1.18 eV, would first then distance increases; due energy splitting caused molecules. This study proposes a new perspective understanding photoresponse D/A interface, which provides theoretical insights advancement polarized light detection optoelectronics.

Language: Английский

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Optimized dense fibril network by ternary strategy to improve charge transport and realize efficient organic solar cells

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 160548 - 160548

Published: Feb. 1, 2025

Language: Английский

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Minimizing Energy Loss by Designing Multifunctional Solid Additives to Independent Regulation of Donor and Acceptor Layers for Efficient LBL Polymer Solar Cells

Advanced Science, Journal Year: 2025, Volume and Issue: unknown

Published: March 20, 2025

Solid additives are crucial in layer-by-layer (LBL) polymer solar cells (PSCs). Despite its importance, the simultaneous application of solid into both donor and acceptor layers has been largely overlooked. In this work, two multifunctional actively designed, investigated synergistic effect on layers. Incorporating layer could effectively enhance aggregation molecular stacking polymer, leading to reduced energy disorder minimizing ΔE2. When introduced layer, they just play a role optimizing morphology, thereby reducing ΔE3. Excitedly, addition produced for decreasing ΔE2 ΔE3 simultaneously, especially adding SA2, thus enabling an excellent power conversion efficiency (PCE) 19.95% (certified as 19.68%) with open-circuit voltage (Voc) 0.921 V, short circuit current density (Jsc) 27.08 mA cm-2 fill factor (FF) 79.98%. The work highlights potential independently regulating properties layers, which is expected promising approach further developing higher performance PSCs.

Language: Английский

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Layer‐by‐Layer Processed Pseudo‐Bilayer Heterojunctions Advance the Performance of Organic Solar Cells

Advanced Energy Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 14, 2025

Abstract Recent progress in organic (semiconductor) solar cells (OSCs) has led to power conversion efficiencies (PCEs) reaching 20%, with predictions that 25% may be possible. Additional PCE improvements, significant efforts have been made address the engineering challenges traditionally limited OSCs small area devices often poor temporal stability. Layer‐by‐layer (LbL) processing of active layers emerged as a promising approach tackle these challenges, numerous state‐of‐the‐art processed using LbL reported. In this Perspective, recent developments are developed enhancing OSC efficiency and stability, particular focus on working mechanisms pseudo‐bilayer heterojunctions (P‐BHJ) practical aspects fabricating high‐performance techniques. By providing insights into resultant film morphology, it is hoped contribute ongoing improve efficiency, scalability explore their potential for broader applications such example indoor light harvesting or agrivoltaics.

Language: Английский

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As-cast organic solar cells with 19.44% efficiency enabled by introducing functional fullerene derivative to facilitate charge carrier generation and transport

Science China Chemistry, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 19, 2024

Language: Английский

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Enriching bottom acceptors for high-performance inkjet-printed organic solar cells

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: unknown, P. 158248 - 158248

Published: Dec. 1, 2024

Language: Английский

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