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

Advanced Materials, Год журнала: 2024, Номер 36(25)

Опубликована: Март 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.

Язык: Английский

---

Near‐Infrared Materials: The Turning Point of Organic Photovoltaics

Advanced Materials, Год журнала: 2021, Номер 34(10)

Опубликована: Окт. 28, 2021

Abstract Near‐infrared (NIR)‐absorbing organic semiconductors have opened up many exciting opportunities for photovoltaic (OPV) research. For example, new chemistries and synthetical methodologies been developed; especially, the breakthrough Y‐series acceptors, originally invented by our group, specifically Y1, Y3, Y6, contributed immensely to boosting single‐junction solar cell efficiency around 19%; novel device architectures such as tandem transparent photovoltaics realized. The concept of NIR donors/acceptors thus becomes a turning point in OPV field. Here, development NIR‐absorbing materials OPVs is reviewed. According low‐energy absorption window, here, (p‐type (polymers) n‐type (fullerene nonfullerene)) are classified into four categories: 700–800 nm, 800–900 900–1000 greater than 1000 nm. Each subsection covers design, synthesis, utilization various types donor (D) acceptor (A) units. structure–property relationship between kinds D, A units window constructed satisfy requirements different applications. Subsequently, variety applications realized materials, including OPVs, photodetectors, presented. Finally, challenges future next‐generation beyond discussed.

Язык: Английский

---

Multiphase Morphology with Enhanced Carrier Lifetime via Quaternary Strategy Enables High‐Efficiency, Thick‐Film, and Large‐Area Organic Photovoltaics

Advanced Materials, Год журнала: 2022, Номер 34(45)

Опубликована: Сен. 15, 2022

With the continuous breakthrough of efficiency organic photovoltaics (OPVs), their practical applications are on agenda. However, thickness tolerance and upscaling in recently reported high-efficiency devices remains challenging. In this work, multiphase morphology desired carrier behaviors realized by utilizing a quaternary strategy. Notably, exciton separation, mobility, lifetime enhanced significantly, recombination energy loss (Eloss ) reduced, thus beneficial for higher short-circuit density (JSC ), fill factor (FF), open-circuit voltage (VOC system. Moreover, intermixing-phase size is optimized, which favorable constructing thick-film large-area devices. Finally, device with 110 nm-thick active layer shows an outstanding power conversion (PCE) 19.32% (certified 19.35%). Furthermore, (1.05 72.25 cm2 nm present PCEs 18.25% 12.20%, 305 film (0.0473 delivers PCE 17.55%, among highest values reported. The work demonstrates potential strategy OPVs promotes application future.

Язык: Английский

---

Solid Additive-Assisted Layer-by-Layer Processing for 19% Efficiency Binary Organic Solar Cells

Nano-Micro Letters, Год журнала: 2023, Номер 15(1)

Опубликована: Апрель 10, 2023

Morphology is of great significance to the performance organic solar cells (OSCs), since appropriate morphology could not only promote exciton dissociation, but also reduce charge recombination. In this work, we have developed a solid additive-assisted layer-by-layer (SAA-LBL) processing fabricate high-efficiency OSCs. By adding additive fatty acid (FA) into polymer donor PM6 solution, controllable pre-phase separation forms between and FA. This intermixed facilitates diffusion acceptor Y6 during LBL processing, due good miscibility fast-solvation FA with chloroform solution dripping. Interestingly, results in desired refined phase-separated domain vertical phase-separation structure better balance transport /collection dissociation. Consequently, binary single junction OSCs based on PM6:Y6 blend reach champion power conversion efficiency (PCE) 18.16% SAA-LBL which can be generally applicable diverse systems, e.g., PM6:L8-BO-based devices thick-film devices. The efficacy confirmed PM6:L8-BO, where record PCEs 19.02% 16.44% are realized for 100 250 nm active layers, respectively. work provides simple effective way control demonstrates promising methodology boosting industrial manufacturing

Язык: Английский

---

Design of Non-fused Ring Acceptors toward High-Performance, Stable, and Low-Cost Organic Photovoltaics

Accounts of Materials Research, Год журнала: 2022, Номер 3(6), С. 644 - 657

Опубликована: Май 25, 2022

ConspectusToward future commercial applications of organic solar cells (OSCs), photovoltaic materials that enable high efficiency, excellent stability, and low cost should be developed. Fused-ring electron acceptors (FREAs) have declared OSCs are capable showing efficiencies over 19%, whereas stability not solved yet. As the counterparts FREAs, non-fused ring (NFREAs) more flexible in molecular design. They better because reduction intramolecular tension via breaking fused backbone advantages with synthetic complexity. However, challenge for NFREAs is relatively lower (around 15% at current stage), which require designs addressing issues conformational unicity effective packing.In this Account, we comprehensively summarize works about carried out our group from three main frameworks, including design efficiency optimization, material cost, stability. First, part existing rotatable single bond will bring problem uncertainty, but it can through proper design, also regulates energy levels, light absorption range, packing mode molecule obtaining higher performance. Thus, part, discuss evolution aspects, skeleton terminal modification, side chain engineering. Many strategies used a skeleton, such as utilizing quinoid effect, introducing functional groups push–pulling using multiple lock. Furthermore, simplifying preferred development tendency. terminal, modification strategy adjusting conjugation length halogen atoms. What more, by to induce appropriate steric hindrance, fix orientation molecules, thus regulating modes. Second, regarding compare synthesis complexities between state-of-the-art FREAs NFREAs. Because processes reduce complex cyclization reactions, routes greatly simplified, obtained minimal steps. Third, analyze workable views intrinsic photostability, thermal Finally, conclude challenges conquered propose perspectives could performed NFREAs, hope pushing toward performance, cost.

Язык: Английский

---

Semi-transparent organic photovoltaics

Chemical Society Reviews, Год журнала: 2023, Номер 52(13), С. 4132 - 4148

Опубликована: Янв. 1, 2023

This tutorial review summarizes the basic concepts, design strategies and potential applications of semi-transparent organic photovoltaics (STOPVs). Challenges research directions toward commercialization STOPVs are also proposed.

Язык: Английский

---

Versatile Sequential Casting Processing for Highly Efficient and Stable Binary Organic Photovoltaics

Advanced Materials, Год журнала: 2022, Номер 34(33)

Опубликована: Июнь 29, 2022

Forming an ideal bulk heterojunction (BHJ) morphology is a critical issue governing the photon to electron process in organic solar cells (OSCs). Complementary widely-used blend casting (BC) method for BHJ construction, sequential (SC) can also enable similar or even better and device performance OSCs. Here, BC SC methods on three representative donor:acceptor (D:A) blends are utilized, that is, PM6:PC71 BM, PM6:IT-4F PM6:L8-BO. Higher power conversion efficiencies (PCEs) all cases by taking advantage of beneficial from processing achieved, champion PCE 18.86% (certified as 18.44%) based PM6:L8-BO reached, representing record value among binary The observations phase separation vertical distribution inspire proposal swelling-intercalation phase-separation model interpret evolution during processing. Further, segregation found deliver improvement via affecting charge transport collection processes, evidenced D:A-ratio-dependent photovoltaic properties. Besides, OSCs show advantages photostability upscale fabrication. This work demonstrates versatility efficacy BHJ-based

Язык: Английский

---

Balancing the Selective Absorption and Photon‐to‐Electron Conversion for Semitransparent Organic Photovoltaics with 5.0% Light‐Utilization Efficiency

Advanced Materials, Год журнала: 2022, Номер 34(41)

Опубликована: Авг. 24, 2022

Efficiently converting invisible light while allowing full visible transmission is key to achieving high-performance semitransparent organic photovoltaics (ST-OPVs). Here, a detailed balance strategy explored optimize the ST-OPV via taking both absorption and carrier dynamics into consideration. Based on this principle, comprehensive optimizations are carried out, including ternary strategy, donor:acceptor blend ratio, thickness, antireflection, etc., compromise energy conversion for ST-OPVs. As result, opaque OPV device exhibits champion power efficiency of 19.35% (certificated 19.07%), most strikingly, best shows remarkably high light-utilization 5.0%, where average 12.95% 38.67%, respectively. An 12.09% achieved upscaled with an area 1.05 cm2 , demonstrating its promise large-area fabrication. These results among values Besides, it demonstrated that good infrared light-reflection capability thermal control. This work provides rational design balancing absorbing selectivity photon-to-electron ST-OPVs, may pave way toward practical application solar windows.

Язык: Английский

---

Aperiodic band-pass electrode enables record-performance transparent organic photovoltaics

Joule, Год журнала: 2022, Номер 6(8), С. 1918 - 1930

Опубликована: Июль 6, 2022

Язык: Английский

---

Theory‐Guided Material Design Enabling High‐Performance Multifunctional Semitransparent Organic Photovoltaics without Optical Modulations

Advanced Materials, Год журнала: 2022, Номер 34(18)

Опубликована: Март 2, 2022

Semitransparent organic photovoltaics (ST-OPVs) have drawn great attention for promising applications in building-integrated photovoltaics, providing additional power generation daily use. A previously proposed strategy, "complementary NIR absorption," is widely applied high-performance ST-OPVs. However, rational material design toward high performance has not been achieved. In this work, an external quantum efficiency (EQE) model describing strategy developed to explore the full potential of on ST-OPV performance. Guided by model, a novel nonfullerene acceptor (NFA), ATT-9, designed and synthesized, which possesses optimal bandgap ST-OPVs, achieving record short-circuit current density 30 mA cm-2 conversion 13.40%, highest value among devices based NFAs with bandgaps lower than 1.2 eV. It notworthy that, at such low bandgap, energy loss device only 0.58 eV, attributed energetic disorder confirmed ultralow Urbach 21.6 meV. Benefiting from loss, ATT-9-based achieves light utilization 3.33% without optical modulations, meanwhile shows excellent thermal insulation, exceeding commercial 3M heat-insulating window film, demonstrating outstanding application prospects multifunctional

Язык: Английский

---