Compromising Charge Generation and Recombination of Organic Photovoltaics with Mixed Diluent Strategy for Certified 19.4% Efficiency DOI
Tianyi Chen, Shuixing Li,

Yaokai Li

et al.

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(21)

Published: March 3, 2023

The ternary blend is demonstrated as an effective strategy to promote the device performance of organic photovoltaics (OPVs) due dilution effect. While compromise between charge generation and recombination remains a challenge. Here, mixed diluent for further improving efficiency OPV proposed. Specifically, high-performance system with polymer donor, i.e., PM6, nonfullerene acceptor (NFA), BTP-eC9, diluted by diluents, which involve high bandgap NFA BTP-S17 low BTP-S16 (similar that BTP-eC9). better miscibility BTP-eC9 can dramatically enhance open-circuit voltage (VOC ), while maximizes or short-circuit current density (JSC ). interplay BTP-17 enables recombination, thus leading 19.76% (certified 19.41%), best among single-junction OPVs. Further analysis on carrier dynamics validates efficacy diluents balancing be attributed more diverse energetic landscapes improved morphology. Therefore, this work provides commercialization.

Language: Английский

High Efficiency Polymer Solar Cells with Efficient Hole Transfer at Zero Highest Occupied Molecular Orbital Offset between Methylated Polymer Donor and Brominated Acceptor DOI
Chenkai Sun, Shucheng Qin, Rui Wang

et al.

Journal of the American Chemical Society, Journal Year: 2020, Volume and Issue: 142(3), P. 1465 - 1474

Published: Jan. 6, 2020

Achieving efficient charge transfer at small frontier molecular orbital offsets between donor and acceptor is crucial for high performance polymer solar cells (PSCs). Here we synthesize a new wide band gap donor, PTQ11, low acceptor, TPT10, report power conversion efficiency (PCE) PSC (PCE = 16.32%) based on PTQ11–TPT10 with zero HOMO (the highest occupied orbital) offset (ΔEHOMO(D–A)). TPT10 derivative of Y6 monobromine instead bifluorine substitution, possesses upshifted lowest unoccupied energy level (ELUMO) −3.99 eV EHOMO −5.52 than Y6. PTQ11 cost PTQ10 methyl substituent its quinoxaline unit shows eV, stronger crystallization, better hole transport capability in comparison PTQ10. The highly exciton dissociation transfer, so that it demonstrates PCE 16.32% higher Voc 0.88 V, large Jsc 24.79 mA cm–2, FF 74.8%, despite the ΔEHOMO(D–A) value TPT10. one efficiencies PSCs. results prove feasibility PSCs ΔEHOMO(D–A), which valuable understanding process achieving

Language: Английский

Citations

389
Fine-Tuning Energy Levels via Asymmetric End Groups Enables Polymer Solar Cells with Efficiencies over 17% DOI Creative Commons
Zhenghui Luo, Ruijie Ma, Tao Liu

et al.

Joule, Journal Year: 2020, Volume and Issue: 4(6), P. 1236 - 1247

Published: May 7, 2020

Language: Английский

Citations

387
Tuning the electron-deficient core of a non-fullerene acceptor to achieve over 17% efficiency in a single-junction organic solar cell DOI
Can Zhu, Jun Yuan, Fangfang Cai

et al.

Energy & Environmental Science, Journal Year: 2020, Volume and Issue: 13(8), P. 2459 - 2466

Published: Jan. 1, 2020

A new small molecule acceptor, Y18, was designed and synthesized. Over 17% efficiency obtained with single junction solar cells based on Y18.

Language: Английский

Citations

381
A monothiophene unit incorporating both fluoro and ester substitution enabling high-performance donor polymers for non-fullerene solar cells with 16.4% efficiency DOI
Huiliang Sun, Tao Liu, Jianwei Yu

et al.

Energy & Environmental Science, Journal Year: 2019, Volume and Issue: 12(11), P. 3328 - 3337

Published: Jan. 1, 2019

Both fluorine and ester substituted monothiophene yielded a novel thiophene derivative FE-T. The resulting polymer donor S1 enabled single-junction non-fullerene solar cell with over 16% efficiency.

Language: Английский

Citations

362
Barrierless Free Charge Generation in the High‐Performance PM6:Y6 Bulk Heterojunction Non‐Fullerene Solar Cell DOI Creative Commons
Lorena Perdigón‐Toro, Huotian Zhang, Anastasia Markina

et al.

Advanced Materials, Journal Year: 2020, Volume and Issue: 32(9)

Published: Jan. 24, 2020

Organic solar cells are currently experiencing a second golden age thanks to the development of novel non-fullerene acceptors (NFAs). Surprisingly, some these blends exhibit high efficiencies despite low energy offset at heterojunction. Herein, free charge generation in high-performance blend donor polymer PM6 with NFA Y6 is thoroughly investigated as function internal field, temperature and excitation energy. Results show that photocurrent essentially barrierless near-unity efficiency, regardless Efficient separation maintained over wide range, down 100 K, small driving force for generation. Studies on concentration NFA, measurements energetic disorder, theoretical modeling suggest CT state dissociation assisted by electrostatic interfacial field which large enough compensate Coulomb barrier.

Language: Английский

Citations

335
PBDB-T and its derivatives: A family of polymer donors enables over 17% efficiency in organic photovoltaics DOI
Zhong Zheng, Huifeng Yao, Long Ye

et al.

Materials Today, Journal Year: 2019, Volume and Issue: 35, P. 115 - 130

Published: Dec. 20, 2019

Language: Английский

Citations

322
14.4% efficiency all-polymer solar cell with broad absorption and low energy loss enabled by a novel polymer acceptor DOI Creative Commons
Tao Jia, Jiabin Zhang, Wenkai Zhong

et al.

Nano Energy, Journal Year: 2020, Volume and Issue: 72, P. 104718 - 104718

Published: March 20, 2020

Language: Английский

Citations

316
All-small-molecule organic solar cells with over 14% efficiency by optimizing hierarchical morphologies DOI Creative Commons

Ruimin Zhou,

Zhaoyan Jiang, Chen Yang

et al.

Nature Communications, Journal Year: 2019, Volume and Issue: 10(1)

Published: Nov. 26, 2019

The high efficiency all-small-molecule organic solar cells (OSCs) normally require optimized morphology in their bulk heterojunction active layers. Herein, a small-molecule donor is designed and synthesized, single-crystal structural analyses reveal its explicit molecular planarity compact intermolecular packing. A promising narrow bandgap with absorption edge of more than 930 nm along our home-designed small molecule selected as electron acceptors. To the best knowledge, binary OSCs achieve highest 14.34% by optimizing hierarchical morphologies, which or acceptor rich domains size up to ca. 70 nm, crystals tens nanometers, together donor-acceptor blending, are proved coexisting large domain. All-small-molecule photovoltaic system shows for performance OSCs, study likely lead insights relations between structure performance.

Language: Английский

Citations

309
Asymmetric Electron Acceptors for High‐Efficiency and Low‐Energy‐Loss Organic Photovoltaics DOI
Shuixing Li, Lingling Zhan, Yingzhi Jin

et al.

Advanced Materials, Journal Year: 2020, Volume and Issue: 32(24)

Published: May 11, 2020

Low energy loss and efficient charge separation under small driving forces are the prerequisites for realizing high power conversion efficiency (PCE) in organic photovoltaics (OPVs). Here, a new molecular design of nonfullerene acceptors (NFAs) is proposed to address above two issues simultaneously by introducing asymmetric terminals. Two NFAs, BTP-S1 BTP-S2, constructed halogenated indandione (A1 ) 3-dicyanomethylene-1-indanone (A2 as different conjugated terminals on central fused core (D), wherein they share same backbone well-known NFA Y6, but at Such NFAs with A1 -D-A2 structure exhibit superior photovoltaic properties when blended polymer donor PM6. Energy analysis reveals that molecule BTP-S2 six chlorine atoms attached enables corresponding devices give an outstanding electroluminescence quantum 2.3 × 10-2 %, one order magnitude higher than based symmetric Y6 (4.4 10-3 %), thus significantly lowering nonradiative devices. Besides, multiple halogen fast hole transfer As result, OPVs PM6:BTP-S2 blend realize PCE 16.37%, (15.79%) PM6:Y6-based OPVs. A further optimization ternary (PM6:Y6:BTP-S2) results best 17.43%, which among highest efficiencies single-junction This work provides effective approach lower promote strategy.

Language: Английский

Citations

305
High Efficiency (15.8%) All-Polymer Solar Cells Enabled by a Regioregular Narrow Bandgap Polymer Acceptor DOI
Huiting Fu, Yuxiang Li, Jianwei Yu

et al.

Journal of the American Chemical Society, Journal Year: 2021, Volume and Issue: 143(7), P. 2665 - 2670

Published: Feb. 10, 2021

Despite the significant progresses made in all-polymer solar cells (all-PSCs) recently, relatively low short-circuit current density (Jsc) and large energy loss are still quite difficult to overcome for further development. To address these challenges, we developed a new class of narrow-bandgap polymer acceptors incorporating benzotriazole (BTz)-core fused-ring segment, named PZT series. Compared commonly used benzothiadiazole (BT)-containing PYT, less electron-deficient BTz renders derivatives with significantly red-shifted optical absorption up-shifted levels, leading simultaneously improved Jsc open-circuit voltage resultant all-PSCs. More importantly, regioregular (PZT-γ) has been achieve higher regiospecificity avoiding formation isomers during polymerization. Benefiting from more extended absorption, better backbone ordering, optimal blend morphology donor component, PZT-γ-based all-PSCs exhibit record-high power conversion efficiency 15.8% greatly enhanced 24.7 mA/cm2 0.51 eV.

Language: Английский

Citations

289