Precisely Controlling the Position of Bromine on the End Group Enables Well‐Regular Polymer Acceptors for All‐Polymer Solar Cells with Efficiencies over 15%

Advanced Materials, Journal Year: 2020, Volume and Issue: 32(48)

Published: Oct. 29, 2020

Recent advances in the development of polymerized A-D-A-type small-molecule acceptors (SMAs) have promoted power conversion efficiency (PCE) all-polymer solar cells (all-PSCs) over 13%. However, monomer an SMA typically consists a mixture three isomers due to regio-isomeric brominated end groups (IC-Br(in) and IC-Br(out)). In this work, two isomeric are successfully separated, regioisomeric issue is solved, polymer acceptors, named PY-IT, PY-OT, PY-IOT, developed, where PY-IOT random terpolymer with same ratio acceptors. Interestingly, from absorption edge gradually redshifts electron mobility progressively increases. Theory calculation indicates that LUMOs distributed on entire molecular backbone contributing enhanced transport. Consequently, PM6:PY-IT system achieves excellent PCE 15.05%, significantly higher than those for PY-OT (10.04%) (12.12%). Morphological device characterization reveals highest PY-IT-based fruit absorption, more balanced charge transport, favorable morphology. This work demonstrates site polymerization SMAs strongly affects performance, offering insights into efficient all-PSCs.

Language: Английский

---

Transition metal-catalysed molecular n-doping of organic semiconductors

Nature, Journal Year: 2021, Volume and Issue: 599(7883), P. 67 - 73

Published: Nov. 3, 2021

Language: Английский

---

Polymer Semiconductors: Synthesis, Processing, and Applications

Chemical Reviews, Journal Year: 2023, Volume and Issue: 123(12), P. 7421 - 7497

Published: May 26, 2023

Polymer semiconductors composed of a carbon-based π conjugated backbone have been studied for several decades as active layers multifarious organic electronic devices. They combine the advantages electrical conductivity metals and mechanical behavior plastics, which are going to become one futures modulable materials. The performance materials depends both on their chemical structures multilevel microstructures in solid states. Despite great efforts that made, they still far from producing clear picture among intrinsic molecular structures, microstructures, device performances. This review summarizes development polymer recent aspects material design related synthetic strategies, processing technologies, functional applications. especially emphasized, plays decisive role determining performance. discussion shows panorama research sets up bridge across finally devices Finally, this discusses grand challenges future opportunities semiconductors.

Language: Английский

---

Regioregular Narrow‐Bandgap n‐Type Polymers with High Electron Mobility Enabling Highly Efficient All‐Polymer Solar Cells

Advanced Materials, Journal Year: 2021, Volume and Issue: 33(37)

Published: Aug. 2, 2021

Abstract Narrow‐bandgap n‐type polymers with high electron mobility are urgently demanded for the development of all‐polymer solar cells (all‐PSCs). Here, two regioregular narrow‐bandgap polymer acceptors, L15 and MBTI, electron‐deficient segments synthesized by copolymerizing dibrominated fused‐ring acceptors (FREA) distannylated aromatic imide, respectively. Taking full advantage FREA both show narrow bandgap mobility. Benefiting from more extended absorption, better backbone ordering, higher than those its regiorandom analog, L15‐based all‐PSC yields a power conversion efficiency (PCE) 15.2% when blended donor PM6. More importantly, MBTI incorporating benzothiophene‐core segment shows relatively frontier molecular orbital levels L15, forming cascade‐like energy level alignment Based on this, ternary all‐PSCs designed where is introduced as guest into PM6:L15 host system. Thanks to further optimal blend morphology balanced charge transport, PCE improved up 16.2%, which among highest values all‐PSCs. The results demonstrate that combining an imide construct provides effective approach fabricate highly efficient

Language: Английский

---

Recent Advances in Single‐Junction Organic Solar Cells

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(37)

Published: July 20, 2022

Single-junction organic solar cells (OSCs) have made significant progress in recent years. Innovations material design and device optimization improved the power conversion efficiencies to over 19 %. In this Minireview, based on advances, we discuss molecular strategies tune absorption spectrum, energy level, intermolecular aggregation as well highlight role of electrostatic potential decreasing loss. Then, introduce latest four types OSCs composed different donor:acceptor combinations: polymer donor:small-molecule acceptor, all-polymer, all-small-molecule, small-molecule donor:polymer acceptor. Finally, challenges practical applications, including cost, stability, multi-function integration, are discussed.

Language: Английский

---

Cyano-Functionalized Bithiophene Imide-Based n-Type Polymer Semiconductors: Synthesis, Structure–Property Correlations, and Thermoelectric Performance

Journal of the American Chemical Society, Journal Year: 2021, Volume and Issue: 143(3), P. 1539 - 1552

Published: Jan. 14, 2021

n-Type polymers with deep-positioned lowest unoccupied molecular orbital (LUMO) energy levels are essential for enabling n-type organic thin-film transistors (OTFTs) high stability and thermoelectrics (OTEs) doping efficiency promising thermoelectric performance. Bithiophene imide (BTI) its derivatives have been demonstrated as acceptor units constructing high-performance polymers. However, the electron-rich thiophene moiety in BTI leads to elevated LUMOs resultant hence limits their performance intrinsic stability. Herein, we addressed this issue by introducing strong electron-withdrawing cyano functionality on derivatives. We successfully overcome synthetic challenges developed a series of novel building blocks, CNI, CNTI, CNDTI, which show substantially higher electron deficiencies than does BTI. On basis these acceptor–acceptor type homopolymers copolymers were synthesized featured greatly suppressed (−3.64 −4.11 eV) versus that (−3.48 control polymer PBTI. Their resulted improved OTFTs more efficient n-doping OTEs corresponding highest electrical conductivity 23.3 S cm–1 power factor ∼10 μW m–1 K–2. The among values reported solution-processed molecularly n-doped new CNDTI offer remarkable platform polymers, study demonstrates cyano-functionalization is very effective strategy developing deep-lying electronic devices.

Language: Английский

---

A Synergistic Strategy of Manipulating the Number of Selenophene Units and Dissymmetric Central Core of Small Molecular Acceptors Enables Polymer Solar Cells with 17.5 % Efficiency

Angewandte Chemie International Edition, Journal Year: 2021, Volume and Issue: 60(35), P. 19241 - 19252

Published: June 3, 2021

Abstract A dissymmetric backbone and selenophene substitution on the central core was used for synthesis of symmetric or A‐DA′D‐A type non‐fullerene small molecular acceptors (NF‐SMAs) with different numbers selenophene. From S‐YSS‐Cl to A‐WSSe‐Cl S‐WSeSe‐Cl , a gradually red‐shifted absorption larger electron mobility crystallinity in neat thin film observed. exhibit stronger tighter intermolecular π–π stacking interactions, extra S⋅⋅⋅N non‐covalent interactions from benzothiadiazole, better ordered 3D interpenetrating charge‐transfer networks comparison thiophene‐based . The ‐based device has PCE 17.51 %, which is highest value selenophene‐based NF‐SMAs binary polymer solar cells. combination precise replacement effective improve J sc FF without sacrificing V oc

Language: Английский

---

n-Type Organic and Polymeric Semiconductors Based on Bithiophene Imide Derivatives

Accounts of Chemical Research, Journal Year: 2021, Volume and Issue: 54(20), P. 3804 - 3817

Published: Oct. 7, 2021

ConspectusIn the last three decades, p-type (hole-transporting) organic and polymeric semiconductors have achieved great success in terms of materials diversity device performance, while development n-type (electron-transporting) analogues greatly lags behind, which is limited by scarcity highly electron-deficient building blocks with compact geometry good solubility. However, such are essential due to existence p-n junction a complementary metal oxide semiconductor (CMOS)-like circuit electronic devices. Among various blocks, imide-functionalized arenes, as naphthalene diimide (NDI) perylene (PDI), been proven be most promising ones for developing semiconductors. Nevertheless, phenyl-based NDI PDI lead sizable steric hindrance neighboring (hetero)arenes high degree backbone distortion resultant semiconductors, limits their microstructural ordering charge transport. To attenuate associated PDI, novel heteroarene, bithiophene imide (BTI), was designed; however, BTI-based suffer from high-lying frontier molecular orbital (FMO) energy levels result electron-rich thiophene framework monoimide group, detrimental performance.In this Account, we review series BTI derivatives developed via strategies, including ring fusion, thiazole substitution, fluorination, cyanation, chalcogen elaborate synthesis routes designed overcome challenges electron deficiency. After structural optimization, these can not only retain advantages solubility, planar backbone, small inherited but also suppressed FMO levels. These enable construction number particularly acceptor-acceptor (or all-acceptor)-type polymers, remarkable performance devices, mobility (μe) 3.71 cm2 V-1 s-1 thin-film transistors (OTFTs), power conversion efficiency (PCE) 15.2% all-polymer solar cells (all-PSCs), PCE 20.8% inverted perovskite (PVSCs), electrical conductivity (σ) 0.34 S cm-1 factor (PF) 1.52 μW m-1 K-2 self-doped diradicals, σ 23.3 PF ∼10 molecularly n-doped all among best values each type device. The structure-property-device correlations elucidated. design strategy provide important information optimized physicochemical properties. Finally, offer our insights into further built them.

Language: Английский

---

A Distannylated Monomer of a Strong Electron‐Accepting Organoboron Building Block: Enabling Acceptor–Acceptor‐Type Conjugated Polymers for n‐Type Thermoelectric Applications

Angewandte Chemie International Edition, Journal Year: 2021, Volume and Issue: 60(29), P. 16184 - 16190

Published: May 7, 2021

Abstract Acceptor–acceptor (A‐A) copolymerization is an effective strategy to develop high‐performance n‐type conjugated polymers. However, the development of A‐A type polymers challenging due synthetic difficulty. Herein, a distannylated monomer strong electron‐deficient double B←N bridged bipyridine (BNBP) unit readily synthesized and used by Stille polycondensation. The resulting show ultralow LUMO energy levels −4.4 eV, which among lowest value reported for organoboron After n‐doping, exhibit electric conductivity 7.8 S cm −1 power factor 24.8 μW m K −2 . This performance best polymer thermoelectric materials. These results demonstrate great potential thermoelectrics.

Language: Английский

---

Recent Progress in Organic Solar Cells: A Review on Materials from Acceptor to Donor

Molecules, Journal Year: 2022, Volume and Issue: 27(6), P. 1800 - 1800

Published: March 10, 2022

In the last few decades, organic solar cells (OSCs) have drawn broad interest owing to their advantages such as being low cost, flexible, semitransparent, non-toxic, and ideal for roll-to-roll large-scale processing. Significant advances been made in field of OSCs containing high-performance active layer materials, electrodes, interlayers, well novel device structures. Particularly, innovation including acceptors donors, has contributed significantly power conversion efficiency (PCE) improvement OSCs. this review, acceptors, fullerene derivatives, small molecular, polymeric non-fullerene (NFAs), are discussed detail. Meanwhile, highly efficient donor materials designed fullerene- NFA-based also presented. Additionally, motivated by incessant developments acceptor recent ternary tandem reviewed well.

Language: Английский

---