Fine-Tuning the Dipole Moment of Asymmetric Non-Fullerene Acceptors Enabling Efficient and Stable Organic Solar Cells DOI
Zihao Xia, Jinsheng Zhang, Xiang Gao

et al.

ACS Applied Materials & Interfaces, Journal Year: 2021, Volume and Issue: 13(20), P. 23983 - 23992

Published: May 17, 2021

Modifying molecular conjugation has been demonstrated as an effective strategy to enhance the photovoltaic performance of non-fullerene small molecule acceptors (SMAs), which would regulate packing and nanoscale morphology in active layer organic solar cells (OSCs). Here, two novel SMAs PTIC-4Cl PT2IC-4Cl are designed synthesized by expanding core unit TB-4Cl one or directions. The effects how expand length on absorption property, energy levels, dipole moment, solubility studied via theoretical calculation experiments. Compared PT2IC-4Cl, with a more asymmetric structure exhibits larger moment enhanced intermolecular packing. PTIC-4Cl-based OSCs exhibit favorable balanced charge transport, thereby leading highest power conversion efficiencies. In addition, devices show outstanding thermal air stability. These results reveal that fine-tuning rationally A-D1A′D2-A-type is critical achieve high-performance OSCs.

Language: Английский

Non‐Radiative Recombination Energy Losses in Non‐Fullerene Organic Solar Cells DOI
Dan He, Fuwen Zhao,

Chunru Wang

et al.

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 32(19)

Published: Feb. 5, 2022

Abstract Impressive short‐circuit current density and fill factor have been achieved simultaneously in single‐junction organic solar cells (OSCs) with the emergence of high‐performance non‐fullerene acceptors. However, power conversion efficiencies (PCEs) OSCs still lag behind those inorganic perovskite cells, mainly due to modest open‐circuit voltage ( V OC ) imposed by relatively large energy loss E ). Generally, can be divided into three parts. Among them, Δ 1 is inevitable for all photovoltaic depends on optical bandgap while radiative recombination loss, 2 , approach negligible value via finely matching donor acceptor material blend. The non‐radiative 3 becomes main barrier further reduce thus enhance PCE acceptor‐based OSCs. In this review, recent studies achievements about summarized from aspects design, morphology manipulation, ternary strategy, mechanism, theoretical study. It hoped that review helps get a deep understanding boost advance study

Language: Английский

Citations

122
Regioisomer‐Free Difluoro‐Monochloro Terminal‐based Hexa‐Halogenated Acceptor with Optimized Crystal Packing for Efficient Binary Organic Solar Cells DOI Open Access
Yan Lü, Heng Zhang, Qiaoshi An

et al.

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(46)

Published: Sept. 2, 2022

Herein, we synthesized new hetero-halogenated end groups with well-determined fluorinated and chlorinated substitutions (o-FCl-IC FClF-IC), regioisomer-free small molecular acceptors (SMAs) Y-Cl, Y-FCl, Y-FClF distinct terminals, respectively. The single-crystal structures theoretical calculations indicate that exhibits more compact three-dimensional network packing significant π-π electronic coupling compared to Y-FCl. From Y-Cl Y-FCl Y-FClF, the neat films exhibit a narrower optical band gap gradually enhanced electron mobility crystallinity. PM6 : blend film strongest crystallinity preferential face-on packing, desirable fibrous morphology suitable phase segregation, highest balanced charge mobilities among three films. Overall, organic solar cells (OSCs) deliver remarkable efficiency of 17.65 %, outperforming which is best PCE for reported hetero-halogens-based SMAs in binary OSCs. Our results demonstrate difluoro-monochloro hetero-terminal superior regio-regular unit enhancing intermolecular crystal photovoltaic performance SMAs.

Language: Английский

Citations

90
Unraveling Urbach Tail Effects in High-Performance Organic Photovoltaics: Dynamic vs Static Disorder DOI Creative Commons
Chujun Zhang, Sudhi Mahadevan, Jun Yuan

et al.

ACS Energy Letters, Journal Year: 2022, Volume and Issue: 7(6), P. 1971 - 1979

Published: May 16, 2022

The origin of Urbach energy (EU) in organic semiconductors and its effect on photovoltaic properties remain a topic intense interest. In this letter, we demonstrate quantitative information the EU value emerging Y-series molecules by an in-depth analysis line shape temperature-dependent quantum efficiency spectra. We found that static disorder (EU(0)), which is dominated conformational uniformity acceptors, contributes 10–25 meV to total energy. Particularly, contribution solar cells (OSCs) much higher than those (EU(0) ≈ 3–6 meV) inorganic/hybrid counterparts, such as CH3NH3PbI3 perovskite, crystalline silicon (c-Si), gallium nitride (GaN), indium phosphide (InP), arsenide (GaAs). More importantly, establish clear correlations between performance open-circuit voltage loss. These results suggest suppressing via rational molecular design clearly path for achieving performance.

Language: Английский

Citations

80
Recent Developments of Polymer Solar Cells with Photovoltaic Performance over 17% DOI
Jianghao Jin,

Qiao Wang,

Kaige Ma

et al.

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(14)

Published: Jan. 22, 2023

Abstract With the emergence of ADA'DA‐type (Y‐series) non‐fullerene acceptors (NFAs), power conversion efficiencies (PCEs) organic photovoltaic devices have been constantly refreshed and gradually reached 20% in recent years (19% for single junction tandem device). The possess specific design concept, which greatly enrich NFA types excellent compatibility with many donor materials. It is gratifying to note that previously underperforming materials combine these regulated shine again. Nowadays, concept modular widely used research donors, injecting new vitality into field photovoltaics. Furthermore, also promote multicomponent devices, bilayer processing solvent engineering, additive engineering. Herein, latest progresses polymer solar cells efficiency over 17% are briefly reviewed from aspects active material design, interface development, device technology. At last, opportunities challenges commercialization future discussed.

Language: Английский

Citations

74
Unidirectional Sidechain Engineering to Construct Dual‐Asymmetric Acceptors for 19.23 % Efficiency Organic Solar Cells with Low Energy Loss and Efficient Charge Transfer DOI
Qunping Fan, Ruijie Ma, Jie Yang

et al.

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

Citations

71
On the Conformation of Dimeric Acceptors and Their Polymer Solar Cells with Efficiency over 18 % DOI Creative Commons
Jingnan Wu, Zhaoheng Ling, Leandro R. Franco

et al.

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(45)

Published: June 29, 2023

The determination of molecular conformations oligomeric acceptors (OAs) and their impact on packing are crucial for understanding the photovoltaic performance resulting polymer solar cells (PSCs) but have not been well studied yet. Herein, we synthesized two dimeric acceptor materials, DIBP3F-Se DIBP3F-S, which bridged segments Y6-derivatives by selenophene thiophene, respectively. Theoretical simulation experimental 1D 2D NMR spectroscopic studies prove that both dimers exhibit O-shaped other than S- or U-shaped counter-ones. Notably, this conformation is likely governed a distinctive "conformational lock" mechanism, arising from intensified intramolecular π-π interactions among terminal groups within dimers. PSCs based deliver maximum efficiency 18.09 %, outperforming DIBP3F-S-based (16.11 %) ranking highest efficiencies OA-based PSCs. This work demonstrates facile method to obtain OA highlights potential high-performance

Language: Английский

Citations

68
On the role of asymmetric molecular geometry in high-performance organic solar cells DOI Creative Commons
Jinfeng Huang, Tianyi Chen,

Le Mei

et al.

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: April 16, 2024

Abstract Although asymmetric molecular design has been widely demonstrated effective for organic photovoltaics (OPVs), the correlation between geometry and their optoelectronic properties is still unclear. To access this issue, we have designed synthesized several symmetric-asymmetric non-fullerene acceptors (NFAs) pairs with identical physical properties. Interestingly, found that NFAs universally exhibited increased open-circuit voltage compared to symmetric counterparts, due reduced non-radiative charge recombination. From our molecular-dynamic simulations, NFA naturally exhibits more diverse interaction patterns at donor (D):acceptor (A) interface as ones, well higher D:A interfacial charge-transfer state energy. Moreover, it observed structure can effectively suppress triplet formation. These advantages enable a best efficiency of 18.80%, which one champion results among binary OPVs. Therefore, work unambiguously demonstrates unique advantage geometry, unveils underlying mechanism, highlights manipulation an important consideration future design.

Language: Английский

Citations

29
Advances in organic solar cells: Materials, progress, challenges and amelioration for sustainable future DOI
Ajay K. Jain, Richa Kothari, V.V. Tyagi

et al.

Sustainable Energy Technologies and Assessments, Journal Year: 2024, Volume and Issue: 63, P. 103632 - 103632

Published: Feb. 14, 2024

Language: Английский

Citations

26
Regulation of molecular orientation in organic solar cells DOI
Qiuju Liang,

Mingzhi Duan,

Ziqi Geng

et al.

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

Published: March 28, 2024

Language: Английский

Citations

26
High‐Performance Photoactive Polymers: Innovations in Ternary Polymerization for Solar Applications DOI Open Access

Yu Fang,

Bin Huang,

Xiaoping Wang

et al.

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

Published: Feb. 2, 2025

Abstract In recent years, polymer solar cells (PSCs) have achieved rapid progress, with power conversion efficiencies (PCEs) reaching up to 20.25%, driven by significant advancements in device fabrication and active‐layer materials. The ternary polymerization strategy has proven be a straightforward effective approach for developing high‐performance photoelectric polymers incorporating third monomer into the backbone. This incorporation effectively optimizes intrinsic properties, including UV–vis absorption, energy levels, solubility, crystallinity, morphology, charge transfer, mechanical robustness, batch‐to‐batch reproducibility, stability. review highlights latest designing photoactive copolymers (both donors acceptors), particular focus on stability, potential applications commercial development. aim is provide valuable guidance development of materials using strategy.

Language: Английский

Citations

2