A novel random terpolymer for high-efficiency bulk-heterojunction polymer solar cells

Bang, Sumi; Kang, Sungkyoung; Lee, You-Sun; Lim, Bogyu; Heo, Hyojung; Lee, Jaechol; Lee, Youngu; Na, Seok‐In

doi:10.1039/c6ra27518d

Cited by 16 publications

(7 citation statements)

References 36 publications

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“…Moreover, the π–π stacking distances of the blended films are calculated to be (3.86, 3.81, and 3.77) Å for the Pristine, DIO, and DIO/Annealing, respectively. These results clearly indicate that slot‐die coated films with additive and thermal annealing treatments decrease the π–π stacking distance of face‐on orientation, leading to highly improved intermolecular interaction and charge transport in the blended film, and thus resulting in high J sc , FF, and PCE. For better understanding of the enhanced PSC‐performances with slot‐die coating, the nanoscale‐morphology of the printed ternary‐blend films was studied using atomic force microscopy (AFM), as presented in Figure d–f.…”

Section: Representative Photovoltaic Parameters Of the Ptb7‐th:pc71bmsupporting

confidence: 76%

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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Section: Representative Photovoltaic Parameters Of the Ptb7‐th:pc71bmsupporting

confidence: 76%

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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“…Moreover, the similar designing strategy for TPD‐based terpolymers was also reported by Na and co‐workers. To achieve highly ordered crystallinity, they used linear block terthiophene unit to partly substitute 2D monomer BDT in BDT‐TPD conjugated copolymer . The resulted random terpolymer TD25 exhibited strong and regular crystalline structure after DIO treatment, leading to an improvement in both μ h and μ e with 1—2 orders higher than those of the as‐cast films.…”

Section: Efficient Terpolymer Donors With Representative Building Blocksmentioning

confidence: 99%

Conjugated Random Terpolymer Donors towards High‐Efficiency Polymer Solar Cells

Gao

Tao

et al. 2020

Chin. J. Chem.

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Over the past decades, polymer solar cells (PSCs) which contain conjugated polymers as electron donor and/or acceptor materials in active layers have achieved the power conversion efficiency (PCE) over 17%. Among them, tremendous alternative donor-acceptor (D-A) type conjugated copolymers have been reported as donor materials. Nevertheless, plenty of rooms still exist to further improve the photovoltaic performance for practical applications. Besides the exploration of the increasingly challenging novel D and/or A monomers to construct new D-A copolymer donors, conjugated random terpolymer donors which involve a third existing monomer (D or A) provide an extra simple promising strategy to promote the photovoltaic performance to a higher level. Herein, recent progress on random terpolymer donors for efficient PSCs was reviewed. Firstly, random terpolymer donors were classified by several typical molecular building blocks. Then, the influences of the third monomer on various random terpolymers were highlighted according to the enhancement of light-harvesting ability, modification of energy levels and optimization of the bulk-heterojunction (BHJ) morphology. Finally, several issues which might be concerned in future research on random terpolymer donors were proposed. This review may be helpful for providing guidelines to design efficient random terpolymer donors as well as better-understanding of the structure-property-performance correlations towards high performance PSCs via random terpolymer approach.

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“…In both acceptor types, P28 outperformed due to its enhanced optical absorption and fine-tuned electrochemical and morphological properties. Another versatile aromatic structure molecular with two imide functional groups, easy synthesis and provides structural flexibility is TPD (Zou et al, 2010;Bang et al, 2017; Heo et al, 2018). Terpolymers based on TPD molecular unit have been reported.…”

Section: Benzodithiophenedione (Bdd) and Thienopyrroledione (Tpd) Rinmentioning

confidence: 99%

“…Terpolymers based on TPD molecular unit have been reported. Bang et al (2017) reported a terpolymer based on TPD, BDT and terthiophene molecular structures in a 50, 25, and 25% mixing molar ratio of the monomers, respectively (P31) (Figure 4). It showed broad optical absorption (300-700 nm) and a band gap of 1.84 eV.…”

Section: Benzodithiophenedione (Bdd) and Thienopyrroledione (Tpd) Rinmentioning

confidence: 99%

Recent Advances in the Synthesis of Electron Donor Conjugated Terpolymers for Solar Cell Applications

2020

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The synthesis of donor (D)-acceptor (A) polymers using structurally elaborated monomers is an active research field. Some of the challenges with the use of alternating D-A polymers for photovoltaic applications are the relatively narrow absorption widths, the presence an absorption valleys in the visible region, unoptimized molecular energy levels and even lack of compatibility of the polymers with the common acceptors. The synthesis and characterization of polymers consisting of multiple chromophores (random and regular terpolymers) with complementing properties is currently gaining momentum in order to delicately optimize properties of polymers. A random terpolymer can either be of a system composed of one donor and two acceptors [(D-A1)-ran-(D-A2)] or a one acceptor and two donor segments [(D1-A)-ran-(D2-A)] incorporated in the polymer backbone. By varying the composition of the monomers in the feed of the polymerization reaction, the properties of the resulting terpolymers can be carefully optimized. Using this strategy, many materials with desired properties have been developed and power conversion efficiency (PCE) surpassing 14% in a single layer bulk heterojunction (BHJ) solar cell device have been reported. This review summarizes the most recent advances made in the development of electron donor terpolymers for organic photovoltaics (OPVs). The properties of the terpolymers are compared with their respective reference polymer.

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A novel random terpolymer for high-efficiency bulk-heterojunction polymer solar cells

Abstract: A new random terpolymer, coded LGC-D013, based on TPD as the acceptor and BDT and terthiophene as the donor units, has been synthesized and characterized for donor material in bulk-heterojunction (BHJ) organic photovoltaic (OPV) application.

Cited by 16 publications

References 36 publications

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

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

Conjugated Random Terpolymer Donors towards High‐Efficiency Polymer Solar Cells

Recent Advances in the Synthesis of Electron Donor Conjugated Terpolymers for Solar Cell Applications

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