19.7% efficiency binary organic solar cells achieved by selective core fluorination of nonfullerene electron acceptors

Joule, Journal Year: 2024, Volume and Issue: 8(3), P. 835 - 851

Published: Jan. 30, 2024

Language: Английский

---

High‐Performance Organic Solar Cells Containing Pyrido[2,3‐b]quinoxaline‐Core‐Based Small‐Molecule Acceptors with Optimized Orbit Overlap Lengths and Molecular Packing

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(30)

Published: May 26, 2023

Abstract The central core in A‐DA 1 D‐A‐type small‐molecule acceptor (SMAs) plays an important role determining the efficiency of organic solar cells (OSCs), while principles governing efficient design SMAs remain elusive. Herein, we developed a series with pyrido[2,3‐ b ]quinoxaline (PyQx) as new electron‐deficient unit by combining cascade‐chlorination strategy, namely Py1, Py2, Py3, Py4 and Py5. introduction chlorine atoms reduces intramolecular charge transfer effects but elevates LUMO values. Density functional theory (DFT) reveals that Py2 ortho substituted PyQx Py5 two yield larger dipole moments smaller π⋅⋅⋅π stacking distances, compared other three acceptors. Moreover, shows strongest light absorption capability induced extended orbit overlap lengths more packing structures dimers. These features endow best device performance due to better molecular aggregation behaviors, suitable domain sizes exciton dissociation recombination. This study highlights significance incorporating large moments, small distances dimers into development high‐performance SMAs, providing insight for OSCs.

Language: Английский

---

Side-chain engineering of nonfullerene small-molecule acceptors for organic solar cells

Energy & Environmental Science, Journal Year: 2023, Volume and Issue: 16(7), P. 2732 - 2758

Published: Jan. 1, 2023

This review summarizes the side-chain engineering of nonfullerene small-molecule acceptors (SMAs) in field organic solar cells, discusses key structure–property relationships depth and future directions engineering.

Language: Английский

---

Unidirectional Sidechain Engineering to Construct Dual‐Asymmetric Acceptors for 19.23 % Efficiency Organic Solar Cells with Low Energy Loss and Efficient Charge Transfer

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(36)

Published: July 18, 2023

Achieving both high open-circuit voltage (Voc ) and short-circuit current density (Jsc to boost power-conversion efficiency (PCE) is a major challenge for organic solar cells (OSCs), wherein energy loss (Eloss inefficient charge transfer usually take place. Here, three new Y-series acceptors of mono-asymmetric asy-YC11 dual-asymmetric bi-asy-YC9 bi-asy-YC12 are developed. They share the same asymmetric D1 AD2 (D1 =thieno[3,2-b]thiophene D2 =selenopheno[3,2-b]thiophene) fused-core but have different unidirectional sidechain on side, allowing fine-tuned molecular properties, such as intermolecular interaction, packing pattern, crystallinity. Among binary blends, PM6 : one has better morphology with appropriate phase separation higher order than asy-YC9 bi-asy-YC11 ones. Therefore, bi-asy-YC12-based OSCs offer PCE 17.16 % Voc Jsc , due reduced Eloss efficient properties. Inspired by strong NIR-absorption, introduced into L8-BO construct ternary OSCs. Thanks broadened absorption, optimized morphology, furtherly minimized achieve champion 19.23 %, which highest efficiencies among these annealing-free devices. Our developed engineering constructing bi-asymmetric provides an approach

Language: Английский

---

Hybrid Cycloalkyl‐Alkyl Chain‐Based Symmetric/Asymmetric Acceptors with Optimized Crystal Packing and Interfacial Exciton Properties for Efficient Organic Solar Cells

Advanced Science, Journal Year: 2023, Volume and Issue: 10(7)

Published: Jan. 2, 2023

Abstract Hybrid cycloalkyl‐alkyl side chains are considered a unique composite side‐chain system for the construction of novel organic semiconductor materials. However, there is lack fundamental understanding variations in single‐crystal structures as well optoelectronic and energetic properties generated by introduction hybrid electron acceptors. Herein, symmetric/asymmetric acceptors (Y‐C10ch A‐C10ch) bearing bilateral unilateral 10‐cyclohexyldecyl designed, synthesized, compared with symmetric acceptor 2,2′‐((2Z,2′Z)‐((12,13‐bis(2‐butyloctyl)‐3,9 bis(ethylhexyl)‐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 (L8‐BO). The stepwise decreases optical bandgap, deepens energy level, enables molecules to pack closely regular manner. Crystallographic analysis demonstrates that chain endows more planar skeleton enforces compact 3D network packing, resulting an active layer higher domain purity. Moreover, affects donor/acceptor interfacial energetics accelerates exciton dissociation, enabling power conversion efficiency (PCE) >18% 2,2′‐((2Z,2′Z)‐((12,13‐bis(2‐ethylhexyl)‐3,9‐diundecyl12,13‐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 (Y6) (PM6):A‐C10ch‐based solar cells (OSCs). Importantly, incorporation Y‐C10ch third component PM6:L8‐BO blend results PCE 19.1%. superior molecular packing behavior highlighted here fabrication high‐performance OSCs.

Language: Английский

---

Non‐Halogen Solvent Processed Binary Organic Solar Cells with Efficiency of 19% and Module Efficiency Over 15% Enabled by Asymmetric Alkyl Chain Engineering

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 13(39)

Published: Sept. 3, 2023

Abstract The effective molecular design of non‐fullerene acceptors is important to high‐efficiency organic solar cells. Herein, asymmetric alkyl chain engineering applied a new acceptor named DTC11. Compared with the model accpetor DTY6 two long‐branched chains (2‐decyltetradecyl) on dithie‐nothiophen[3.2‐b]‐pyrrolobenzothiadiazole central unit, DTC11 owns 2‐decyltetradecyl and an undecyl in inner bay side unit. It found that such modification long chains, crystallinity, absorption coefficient, exciton lifetime are all improved. Moreover, comparison D18:DTY6 device, non‐halogen solvent processed D18:DTC11 device shows enhanced generation dissociation, improved charge transport as well weak recombination, promoting higher short‐circuit current density fill factor. Consequently, delivers outstanding efficiency 19.0%. More significantly, large‐area module (active area 21 cm 2 ) fabricated by blade coating, impressive 15.4% factor 74.6% realized. This study demonstrates feasible strategy high‐performance processability, which very essential for commercialization module.

Language: Английский

---

1,5-Diiodocycloctane: a cyclane solvent additive that can extend the exciton diffusion length in thick film organic solar cells

Energy & Environmental Science, Journal Year: 2024, Volume and Issue: 17(5), P. 1916 - 1930

Published: Jan. 1, 2024

The addition of cyclane 1,5-diiodocycloctane (DICO) provides critical roles in extending exciton diffusion length within active layer, consequently contributing to the improvement power conversion. efficiency thick film organic solar cells.

Language: Английский

---

High‐Efficiency All‐Small‐Molecule Organic Solar Cells Based on New Molecule Donors with Conjugated Symmetric/Asymmetric Hybrid Cyclopentyl‐Hexyl Side Chains

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(24)

Published: March 15, 2023

Abstract All small molecule organic solar cells (ASM‐OSCs) have numerous advantages but lower power conversion efficiencies (PCEs) than their polymer equivalents, which is largely due to the suboptimal nanoscale network structure in a bulk heterojunction (BHJ). Herein, new donors with symmetric/asymmetric hybrid cyclopentyl‐hexyl side chains are designed, accounting for manipulated intermolecular interactions and BHJ morphology. Theoretical experimental results reveal that asymmetric modification has significant influence on potential energy surface interaction can ensure preferable molecular assembly regulate D/A interfacial energetics, thus boosting exciton dissociation charge transport when pairing wide‐used acceptor L8‐BO. Concurrently, bicontinuous interpenetrating optimal domain size be fully evolved layer. As consequence, As‐TCp‐based binary device achieves superior PCE of 16.46% comparison controlled symmetric counterparts S‐BF (14.92%) A‐TCp (15.77%), ranks one best performance among ASM‐OSCs. This study demonstrates precise manipulation cyclo‐alkyl chain combination 2D strategy an effective synergistic approach control phase separation achieving high‐performance

Language: Английский

---

Regulation of molecular orientation in organic solar cells

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 488, P. 150783 - 150783

Published: March 28, 2024

Language: Английский

---

High-Efficiency Ternary Polymer Solar Cells with a Gradient-Blended Structure Fabricated by Sequential Deposition

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(12), P. 15121 - 15132

Published: March 19, 2024

Acquiring the ideal blend morphology of active layer to optimize charge separation and collection is a constant goal polymer solar cells (PSCs). In this paper, ternary strategy sequential deposition process were combined make sufficient use spectrum, energy-level structure, regulate vertical phase morphology, ultimately enhance power conversion efficiency (PCE) stability PSCs. Specifically, donor acceptor illustrated gradient-blended distribution in deposition-processed films, thus resulting facilitated carrier characteristics devices. Consequently, PSCs based on D18-Cl/Y6:ZY-4Cl have achieved device over 18% with synergetic improvement open-circuit voltage (VOC), short-circuit current density (JSC), fill factor (FF). Therefore, work reveals facile approach fabricating improved performance stability.

Language: Английский

---