A feasible random copolymer approach for high-efficiency polymeric photovoltaic cells

Lee, You-Sun; Lee, Ji Young; Bang, Sumi; Lim, Bogyu; Lee, Jaechol; Na, Seok‐In

doi:10.1039/c6ta04920f

Cited by 31 publications

(15 citation statements)

References 40 publications

(43 reference statements)

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“…Considering that the EQE-enhancement degree is quite close to the IQE-enhancement degree, it was believed that the improved EQE and J sc shown in LGC-D013-based devices with DIO could mainly be due to the improved charge extraction efficiency caused by the use of the small amounts of additive. 14,[20][21][22] More signicantly, from these device performances, it could be noted that high PCEs of $7% (aer DIO treatment) and $6% (with no treatment) can be achieved with the newly synthesized LGC-D013 random terpolymer, and that the obtained PCE values are among the highest efficiencies so far for normal OPVs based on random or BDT-TPD polymers. [17][18][19][23][24][25][26][27] Surface morphology analysis of the blend lms…”

Section: Organic Photovoltaics Performancementioning

confidence: 85%

“…where J is the current density, 3 0 is the free-space permittivity (8.85 Â 10 14 F cm À1 ), 3 is the relative dielectric constant of the material, m is the mobility of the charge carriers, V is the effective voltage, and L is the thickness of the active layer. 14…”

Section: Photovoltaic Device Fabrication and Characterizationmentioning

confidence: 99%

“…On the basis of a 1 : 2 blend ratio and a 15 mg ml À1 donor-polymer, LGC-D013:PC 71 BM solar cells showed high average power conversion efficiencies (PCEs) of 6.03% without any annealing and additive treatments. According to many former reports that a small concentration of 1,8-diiodooctane (DIO) can signicantly improve the nanoscale morphology, thus enhancing the PCE of OPVs based on polymer/fullerene systems, [14][15][16] different concentrations of DIO were added into the active solutions to further enhance the PCE of the devices. Fig.…”

Section: Organic Photovoltaics Performancementioning

confidence: 99%

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

Bang

Kang²,

Lee

et al. 2017

RSC Adv.

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Section: Organic Photovoltaics Performancementioning

confidence: 85%

Section: Photovoltaic Device Fabrication and Characterizationmentioning

confidence: 99%

Section: Organic Photovoltaics Performancementioning

confidence: 99%

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

Bang

Kang²,

Lee

et al. 2017

RSC Adv.

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“…The photovoltaic cells with P12/PC 71 BM and P13/ PC 71 BM blends exhibit high PCEs up to 5.95% and 7.71%, respectively. 41 Furthermore, after changing the device structure to an inverted one, the PCE with the P13/PC 71 BM blend can be increased to 8.50%, which is among the highest PCE values reported for terpolymers after blending with PC 71 BM.…”

Section: D1a-type Conjugated D-a Terpolymersmentioning

confidence: 68%

“…Terpolymers P12 and P13 contain dialkoxybenzothiadiazole as electron acceptor moieties with two different electron donors in the backbones (Scheme 3). 41 The S … F or S … O interactions make the polymeric backbones more planar, and hence the interchain interactions are enhanced. The photovoltaic cells with P12/PC 71 BM and P13/ PC 71 BM blends exhibit high PCEs up to 5.95% and 7.71%, respectively.…”

Section: D1a-type Conjugated D-a Terpolymersmentioning

confidence: 99%

Conjugated D–A terpolymers for organic field-effect transistors and solar cells

Luo

Liu

Zhang

2017

Polym J

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The incorporation of additional electron donors or acceptors into the backbones of conjugated polymers with alternating donors and acceptors results in various conjugated D-A terpolymers. The presence of additional electron donors or acceptors in the conjugated backbones can modulate the electronic absorptions and highest occupied molecular orbital/lowest unoccupied molecular orbital levels, as well as interchain interactions and thin-film morphology. Because of these structural features, conjugated D-A terpolymers have been intensively investigated in recent years for applications in field-effect transistors and photovoltaic cells. In this review, we introduce the recent developments of conjugated D-A terpolymers with various combinations of electron donors and acceptors, and discuss the future perspectives for conjugated terpolymers. In recent decades, conjugated polymers have demonstrated promising applications in flexible, large-area and low-cost electronic devices, such as organic field-effect transistors (OFETs) 1-3 and solar cells (OSCs). [4][5][6][7] This is attributed to the conjugated electronic and polymeric structures of these polymers, resulting in semiconducting properties with good solution processability, mechanical property and thermal stability. 8,9 Among the conjugated polymers, conjugated alternating polymers consisting of both electron donors (D) and electron acceptors (A), referred to as conjugated D-A polymers, [10][11][12][13][14][15][16][17] have been extensively investigated in recent years. The studies indicate that electronic absorptions, highest occupied molecular orbital/lowest unoccupied molecular orbital (HOMO/LUMO) energies (and bandgaps), interchain interactions and thin-film morphologies of conjugated D-A polymers can be effectively tuned 10-17 by properly varying the electron donors and acceptors as well as the linkers. Consequently, the semiconducting performance of conjugated D-A polymers can be tuned in this way. In fact, polymeric p-type, n-type and even ambipolar semiconductors with high charge mobilities have been developed on the basis of conjugated D-A polymers. 18-21 Moreover, conjugated D-A polymers have been successfully utilized as either electron donors or acceptors for OSCs with high power conversion efficiencies (PCEs). [22][23][24][25] Apart from conjugated polymers with alternating electron donor and acceptor moieties, conjugated D-A terpolymers, which contain either one kind of acceptor/two types of electron donors (2D1A) or one kind of donor/two types of electron acceptors (1D2A) in the backbones as illustrated in Scheme 1, have received increased attention. It is expected that an additional dimension is generated for tuning the electronic structures of conjugated polymers and thus their absorptions and HOMO/LUMO levels as well as interchain packing 8,26 with such conjugated D-A terpolymers. Moreover, the combination of existing electron donors and acceptors can yield a huge number of terpolymers, which can be prepared in the same manner as conventional D-A ...

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High Performance Roll‐to‐Roll Produced Fullerene‐Free Organic Photovoltaic Devices via Temperature‐Controlled Slot Die Coating

Seo

Nah

et al. 2018

Adv Funct Materials

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Solution‐processed organic photovoltaics (OPVs) have continued to show their potential as a low‐cost power generation technology; however, there has been a significant gap between device efficiencies fabricated with lab‐scale techniques—i.e., spin coating—and scalable deposition methods. Herein, temperature‐controlled slot die deposition is developed for the photoactive layer of OPVs. The influence of solution and substrate temperatures on photoactive films and their effects on power conversion efficiency (PCE) in slot die coated OPVs using a 3D printer‐based slot die coater are studied on the basis of device performance, molecular structure, film morphology, and carrier transport behavior. These studies clearly demonstrate that both substrate and solution temperatures during slot die coating can influence device performance, and the combination of hot substrate (120 °C) and hot solution (90 °C) conditions result in mechanically robust films with PCE values up to 10.0% using this scalable deposition method in air. The efficiency is close to that of state‐of‐the‐art devices fabricated by spin coating. The deposition condition is translated to roll‐to‐roll processing without further modification and results in flexible OPVs with PCE values above 7%. The results underscore the promising potential of temperature‐controlled slot die coating for roll‐to‐roll manufacturing of high performance OPVs.

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A feasible random copolymer approach for high-efficiency polymeric photovoltaic cells

Cited by 31 publications

References 40 publications

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

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

Conjugated D–A terpolymers for organic field-effect transistors and solar cells

High Performance Roll‐to‐Roll Produced Fullerene‐Free Organic Photovoltaic Devices via Temperature‐Controlled Slot Die Coating

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