A Narrow‐Bandgap n‐Type Polymer with an Acceptor–Acceptor Backbone Enabling Efficient All‐Polymer Solar Cells

Advanced Materials, Journal Year: 2020, Volume and Issue: 32(43)

Published: Sept. 21, 2020

Narrow-bandgap polymer semiconductors are essential for advancing the development of organic solar cells. Here, a new narrow-bandgap acceptor L14, featuring an acceptor-acceptor (A-A) type backbone, is synthesized by copolymerizing dibrominated fused-ring electron (FREA) with distannylated bithiophene imide. Combining advantages both FREA and A-A polymer, L14 not only shows narrow bandgap high absorption coefficient, but also low-lying frontier molecular orbital (FMO) levels. Such FMO levels yield improved transfer character, unexpectedly, without sacrificing open-circuit voltage (Voc ), which attributed to small nonradiative recombination loss (Eloss,nr ) 0.22 eV. Benefiting from photocurrent along fill factor Voc , excellent efficiency 14.3% achieved, among highest values all-polymer cells (all-PSCs). The results demonstrate superiority polymers improving all-PSC performance pave way toward developing high-performance acceptors all-PSCs.

Language: Английский

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A New Polymer Donor Enables Binary All‐Polymer Organic Photovoltaic Cells with 18% Efficiency and Excellent Mechanical Robustness

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(35)

Published: July 15, 2022

The development of polymerized small-molecule acceptors has boosted the power conversion efficiencies (PCEs) all-polymer organic photovoltaic (OPV) cells to 17%. However, polymer donors suitable for OPV are still lacking, restricting further improvement their PCEs. Herein, a new donor named PQM-Cl is designed and its performance explored. negative electrostatic potential low average local ionization energy distribution surface enable efficient charge generation transfer process. When blending with well-used acceptor, PY-IT, PQM-Cl-based devices deliver an impressive PCE 18.0% superior fill factor 80.7%, both which highest values cells. relevant measurements demonstrate that films possess excellent mechanical flexible properties. As such, fabricated 16.5% high stability displayed. These results candidate provide insights into design high-efficient

Language: Английский

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Progress and prospects of the morphology of non-fullerene acceptor based high-efficiency organic solar cells

Energy & Environmental Science, Journal Year: 2021, Volume and Issue: 14(8), P. 4341 - 4357

Published: Jan. 1, 2021

This review summarizes the important morphological characteristics and recent research progress of non-fullerene acceptor based organic solar cells, as well provides insights perspectives on this topic.

Language: Английский

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Efficient All-Polymer Solar Cells based on a New Polymer Acceptor Achieving 10.3% Power Conversion Efficiency

ACS Energy Letters, Journal Year: 2019, Volume and Issue: 4(2), P. 417 - 422

Published: Jan. 8, 2019

Here we demonstrate efficient all-polymer solar cells (all-PSCs) based on a polymer acceptor named PFBDT-IDTIC. By combining PFBDT-IDTIC with fluorinated donor (PM6), high power conversion efficiency of 10.3% can be achieved, which is the highest value reported to date for single-junction all-PSCs. This performance attributed its good absorption property (absorption coefficient: 2.74 × 105 cm–1) and electron mobility It also found that choice has major impacts cell. replacing PBDB-T counterpart, PM6, VOC, JSC, FF devices were all improved, deeper HOMO level PM6 more crystalline pure domains active layer blends. Our study provides promising all-PSCs shows selecting matching important in achieving optimal all-PSC performance.

Language: Английский

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A Vinylene‐Linker‐Based Polymer Acceptor Featuring a Coplanar and Rigid Molecular Conformation Enables High‐Performance All‐Polymer Solar Cells with Over 17% Efficiency

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(27)

Published: March 22, 2022

State-of-art Y-series polymer acceptors are typically based on a mono-thiophene linker, which can cause some twisted molecular conformations and thus limit the performance of all-polymer solar cells (all-PSCs). Here, high-performance acceptor vinylene linkers is reported, leads to surprising changes in polymers' conformations, optoelectronic properties, enhanced photovoltaic performance. It found that thiophene or bithiophene (PY-T-γ PY-2T-γ) display significant twisting between end-groups linker units, while vinylene-based (PY-V-γ) exhibits more coplanar rigid conformation. As result, PY-V-γ demonstrates better conjugation tighter interchain stacking, results higher mobility reduced energetic disorder. Furthermore, detailed morphology investigations reveal PY-V-γ-based blend high domain purity fill factor its all-PSCs. With these, efficiency 17.1% achieved all-PSCs, highest reported for binary all-PSCs date. This work vinylene-linker superior unit build with chain conformation, beneficial aggregation efficient

Language: Английский

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Regio‐Regular Polymer Acceptors Enabled by Determined Fluorination on End Groups for All‐Polymer Solar Cells with 15.2 % Efficiency

Angewandte Chemie International Edition, Journal Year: 2021, Volume and Issue: 60(18), P. 10137 - 10146

Published: Jan. 27, 2021

Abstract Polymerization sites of small molecule acceptors (SMAs) play vital roles in determining device performance all‐polymer solar cells (all‐PSCs). Different from our recent work about fluoro‐ and bromo‐ co‐modified end group IC‐FBr (a mixture IC‐FBr1 IC‐FBr2), this paper, we synthesized purified two regiospecific substituted groups (IC‐FBr‐ o & IC‐FBr‐ m ), which were then employed to construct regio‐regular polymer named PYF‐T‐ , respectively . In comparison with its isomeric counterparts different conjugated coupling sites, exhibits stronger bathochromic absorption achieve better photon harvesting. Meanwhile, adopts more ordered inter‐chain packing suitable phase separation after blending the donor PM6, resulted suppressed charge recombination efficient transport. Strikingly, observed a dramatic difference between While devices based on PM6:PYF‐T‐ can yield power conversion efficiency (PCE) 15.2 %, only show poor efficiencies 1.4 %. This demonstrates success configuration‐unique fluorinated designing high‐performance regular acceptors, provides guidelines towards developing all‐PSCs efficiencies.

Language: Английский

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Over 14% efficiency all-polymer solar cells enabled by a low bandgap polymer acceptor with low energy loss and efficient charge separation

Energy & Environmental Science, Journal Year: 2020, Volume and Issue: 13(12), P. 5017 - 5027

Published: Jan. 1, 2020

A low bandgap polymer acceptor PF5-Y5 was synthesized and its all-PSCs achieved an impressive device efficiency of 14.45% with both high V_oc J_sc due to the excellent absorption coverage, small energy loss, efficient charge separation.

Language: Английский

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Processing Strategies for an Organic Photovoltaic Module with over 10% Efficiency

Joule, Journal Year: 2019, Volume and Issue: 4(1), P. 189 - 206

Published: Dec. 4, 2019

Language: Английский

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Achieving high efficiency and well-kept ductility in ternary all-polymer organic photovoltaic blends thanks to two well miscible donors

Matter, Journal Year: 2022, Volume and Issue: 5(2), P. 725 - 734

Published: Jan. 4, 2022

Language: Английский

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Organoboron Polymer for 10% Efficiency All-Polymer Solar Cells

Chemistry of Materials, Journal Year: 2020, Volume and Issue: 32(3), P. 1308 - 1314

Published: Jan. 10, 2020

Optoelectronic polymers are always π-conjugated consisting of C, H, N, S, and O elements. The main group element chemistry is a new tool to tune the optoelectronic properties polymers. However, resulting generally show moderate device performance because they cannot meet multiple requirements for solution-processed devices. Herein, we report an organoboron polymer, which can be used as polymer acceptor in all-polymer solar cells (all-PSCs) give power conversion efficiency high 10.1%. By incorporating 2,1,3-benzothiadiazole unit backbone, its absorption spectrum, energy levels, electron mobility, phase separation behavior. All these improvements contribute excellent all-PSC performance. These results prove that containing atoms

Language: Английский

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