26 mA cm−2 Jsc from organic solar cells with a low-bandgap nonfullerene acceptor

Xiao, Zuo; Xue, Jia; Li, Dan; Wang, Shizhe; Geng, Xinjian; Liu, Feng; Chen, Junwu; Yang, Shangfeng; Russell, Thomas P.; Ding, Liming

doi:10.1016/j.scib.2017.10.017

Cited by 376 publications

(219 citation statements)

References 10 publications

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“…[10,11] Finding ways to maximize V OC requires one to reduce the energy loss (E loss = E g opt -eV OC ) that occurs as a result of the multiple states that follow exciton generation. [13][14][15][16][17][18] Tunability of E g opt through molecular design allows one to tailor NIR absorption characteristics. [13][14][15][16][17][18] Tunability of E g opt through molecular design allows one to tailor NIR absorption characteristics.…”

mentioning

confidence: 99%

Bandgap Narrowing in Non‐Fullerene Acceptors: Single Atom Substitution Leads to High Optoelectronic Response Beyond 1000 nm

Lee

Seifrid

et al. 2018

Advanced Energy Materials

151

123

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absorption spectra extending to the NIR region have been designed and applied to the fabrication of OSCs. [6][7][8] A critical challenge arises as one decreases optical bandgaps (E g opt ) with respect to simultaneously achieving a high external quantum efficiency (EQE) and high open-circuit voltage (V OC ). [9] This challenge is due to the counterbalance between the driving force for charge separation, which aids in photocurrent generation, and voltage loss in the cell. [10,11] Finding ways to maximize V OC requires one to reduce the energy loss (E loss = E g opt -eV OC ) that occurs as a result of the multiple states that follow exciton generation. [12] Narrow bandgap (NBG) non-fullerene acceptors (NFAs) have emerged as the next generation of electron acceptors in OSCs. [13][14][15][16][17][18] Tunability of E g opt through molecular design allows one to tailor NIR absorption characteristics. [19,20] Considering that the maximum human photopic sensitivity is 555 nm and the maximum human scotopic sensitivity is 507 nm, [21] transparent photoactive materials should predominantly absorb solar radiation from ≈650 nm into the NIR region for semitransparent solar cell applications. In addition, since ≈50% of solar radiation intensity is in the NIR region, the development of NBG-NFAs with E g opt below ≈1.35 eV is desirable to effectively harvest solar NIR radiation. [1] Another encouraging feature of NFAs is that the energetic offsets that drive charge generation are small (<0.3 eV), [18,[22][23][24] which is beneficial for maintaining low E loss . Despite these desirable features, there has been less consideration for designing NBG-NFAs for transparent/NIR absorbing OSC applications. To address this challenge and expand the design of NIR harvesting acceptor molecules, we demonstrate in this contribution a new molecular design for ultra NBG-NFA materials with strong NIR response and small E loss .The two NBG NFAs described in this contribution are COTIC-4F and SiOTIC-4F (Figure 1a). Their molecular design includes incorporation of a cyclopentadithiophene (CPDT), or dithienosilole (DTS), unit as the central donor (D) fragment, which is flanked by two alkoxythienyl units (D′) to form an electron-rich D′-D-D′ central core. The D′-D-D′ units are end-capped with Two narrow bandgap non-fullerene acceptors (NBG-NFAs), namely, COTIC-4F and SiOTIC-4F, are designed and synthesized for the fabrication of efficient near-infrared organic solar cells (OSCs). The chemical structures of the NBG-NFAs contain a D′-D-D′ electron-rich internal core based on a cyclopentadithiophene (or dithienosilole) (D) and alkoxythienyl (D′) core, end-capped with the highly electron-deficient unit 2-(5,6-difluoro-3-oxo-2,3-dihydro-1H-inden-1-ylidene)malononitrile (A), ultimately providing a A-D′-D-D′-A molecularconfiguration that enhances the intramolecular charge transfer characteristics of the excited states. One can thereby reduce the optical bandgap (E g opt ) to as low as ≈1.10 eV, one of the smallest values for NFAs reported to date. In bulk-he...

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confidence: 99%

Bandgap Narrowing in Non‐Fullerene Acceptors: Single Atom Substitution Leads to High Optoelectronic Response Beyond 1000 nm

Lee

Seifrid

et al. 2018

Advanced Energy Materials

151

123

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“…[22][23][24] In particular, polymer:fullerene:nonfullerene based ternary-blend PSCs, combining the merits of fullerene to provide high electron mobility and nonfullerene acceptors to provide strong near-infrared (NIR) or visible absorption, achieved over 10% PSC-efficiencies. [27,28] More recently, through further optimization, the PTB7-Th:COi8DFIC:PC 71 BM ternary combination produced a record PCE of 14.62%. [27,28] More recently, through further optimization, the PTB7-Th:COi8DFIC:PC 71 BM ternary combination produced a record PCE of 14.62%.…”

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confidence: 99%

Slot‐Die and Roll‐to‐Roll Processed Single Junction Organic Photovoltaic Cells with the Highest Efficiency

Lee

Seo

Kwon

et al. 2019

Advanced Energy Materials

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PSC-efficiencies have increased with intensive effort on novel materials synthesis, film-morphology engineering, and interface control, and the state-of-the-art PSCs have eventually produced a high power conversion efficiency (PCE) of over 15%. [9][10][11][12][13][14][15][16][17][18][19][20][21] For example, Zou et al. reported a newly synthesized nonfullerene acceptor (NFA), Y6, having an electron-deficient-core-based fused ring with a benzothiadiazole unit, and the resulting single-junction PSCs based on PM6:Y6 BHJ showed an excellent efficiency of 15.7% and a certified PCE of 14.9%. [20] In addition, Hou and co-workers recently reported a series of copolymers, and in particular, the copolymer T1 (poly[(2,6-(4,8-bis(5-(2-ethylhexyl)-4-fluorothiophen-2-yl)-benzo[1,2-b:4,5-b′] dithiophene))-alt-(5,5-(1′,3′-di-2-thienyl-5′,7′-bis(2-ethylhexyl)benzo[1′,2′-c:4′,5′-c′] dithiophene-4,8-dione)] (PBDB-TF) = 0.8 and PTO2 = 0.2) produced the bestefficiency of 15.1% and certified PCE of 14.6% in PSCs using 3,9-bis(2-methylene-((3-(1,1-dicyanomethylene)-6,7difluoro)-indanone))-5,5,11,11-tetrakis(4hexylphenyl)-dithieno[2,3-d:2′,3′-d′]-s-indaceno[1,2-b:5,6-b′] dithiophene (IT-4F) acceptor. [21] One of the representative routes to further enhance PSCefficiency is broadening the absorption bandwidth of the active film for better sunlight absorption. [21][22][23] To this end, the ternary The record efficiency of the state-of-the-art polymer solar cells (PSCs) is rapidly increasing, due to the discovery of high-performance photoactive donor and acceptor materials. However, strong questions remain as to whether such high-efficiency PSCs can be produced by scalable processes. This paper reports a high power conversion efficiency (PCE) of 13.5% achieved with single-junction ternary PSCs based on PTB7-Th, PC 71 BM, and COi8DFIC fabricated by slot-die coating, which shows the highest PCE ever reported in PSCs fabricated by a scalable process. To understand the origin of the high performance of the slot-die coated device, slot-die coated photoactive films and devices are systematically investigated. These results indicate that the good performance of the slot-die PSCs can be due to a favorable moleculestructure and film-morphology change by introducing 1,8-diiodooctane and heat treatment, which can lead to improved charge transport with reduced carrier recombination. The optimized condition is then used for the fabrication of large-area modules and also for roll-to-roll fabrication. The slot-die coated module with 30 cm 2 active-area and roll-to-roll produced flexible PSC has shown 8.6% and 9.6%, respectively. These efficiencies are the highest in each category and demonstrate the strong potential of the slot-die coated ternary system for commercial applications. Photovoltaic DevicesThe ORCID identification number(s) for the author(s) of this article can be found under https://doi.Over the past few decades, solution-processed bulk-heterojunction (BHJ) polymer solar cells (PSCs) have continued to demonstrate their potential as a high-ef...

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“…The data were fitted to a power law: J sc ∝ P light α . The α values for PTTABDT and PBTTABDT cells are 0.981 and 0.992, respectively, suggesting less bimolecular recombination in PBTTABDT cells (Figure b) …”

Section: Resultsmentioning

confidence: 97%

Improving Photovoltaic Performance of a Fused‐Ring Azepinedione Copolymer via a D–A–A Design

Zhang

Xiao

et al. 2018

Macromol. Rapid Commun.

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Two conjugated copolymer donors, PTTABDT and PBTTABDT, based on a fused-ring azepinedione acceptor unit, 5-(2-octyldodecyl)-4H-thieno[2',3':4,5]thieno[3,2-c]thieno[2',3':4,5]thieno[2,3-e]azepine-4,6(5H)-dione (TTA), are prepared. PTTABDT possesses a conventional donor-acceptor (D-A) structure with one TTA in the repeat unit, while PBTTABDT has a D-A-A structure with two TTAs in the repeat unit. Compared with PTTABDT, PBTTABDT shows a deeper highest occupied molecular orbital (HOMO) level, a narrower bandgap, and a higher hole mobility, and exhibits better performance in bulk heterojunction solar cells. Power conversion efficiencies of 6.18% and 7.81% are achieved from PTTABDT:PC BM and PBTTABDT:PC BM solar cells, respectively. The higher performance of PBTTABDT:PC BM solar cells results from the enhanced open-circuit voltage (V ) and short-circuit current density ( J ).

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26 mA cm−2 Jsc from organic solar cells with a low-bandgap nonfullerene acceptor

Cited by 376 publications

References 10 publications

Bandgap Narrowing in Non‐Fullerene Acceptors: Single Atom Substitution Leads to High Optoelectronic Response Beyond 1000 nm

Bandgap Narrowing in Non‐Fullerene Acceptors: Single Atom Substitution Leads to High Optoelectronic Response Beyond 1000 nm

Slot‐Die and Roll‐to‐Roll Processed Single Junction Organic Photovoltaic Cells with the Highest Efficiency

Improving Photovoltaic Performance of a Fused‐Ring Azepinedione Copolymer via a D–A–A Design

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26 mA cm−2 Jsc from organic solar cells with a low-bandgap nonfullerene acceptor

Cited by 376 publications

References 10 publications

Bandgap Narrowing in Non‐Fullerene Acceptors: Single Atom Substitution Leads to High Optoelectronic Response Beyond 1000 nm

Bandgap Narrowing in Non‐Fullerene Acceptors: Single Atom Substitution Leads to High Optoelectronic Response Beyond 1000 nm

Slot‐Die and Roll‐to‐Roll Processed Single Junction Organic Photovoltaic Cells with the Highest Efficiency

Improving Photovoltaic Performance of a Fused‐Ring Azepinedione Copolymer via a D–A–A Design

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26 mA cm−2 Jsc from organic solar cells with a low-bandgap nonfullerene acceptor