Ternary Organic Solar Cells Based on a Wide-Bandgap Polymer with Enhanced Power Conversion Efficiencies

Hwang, Hyeongjin; Sin, Dong Hun; Park, Chaneui; Cho, Kilwon

doi:10.1038/s41598-019-48306-x

Cited by 40 publications

(32 citation statements)

References 36 publications

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“…These results demonstrate that the photoexcited electrons are transferred from SM1 to MPU4 and then to PC 71 BM in the OSCs based on a ternary active layer. A similar phenomenon was observed recently in a ternary system consisting of a wide‐bandgap polymer donor, PC 71 BM, and 3,9‐bis(2‐methylene‐(3‐(1,1‐dicyanomethylene)‐indanone))‐5,5,11,11‐tetrakis(4‐hexylphenyl)‐dithieno[2,3‐d:2′,3′‐d′]‐s‐indaceno[1,2‐b:5,6‐b′]dithiophene acceptors . Therefore, an energy level cascade is formed in the ternary blend of SM1:MPU4:PC 71 BM.…”

Section: Resultssupporting

confidence: 84%

Ternary Organic Solar Cell with a Near‐Infrared Absorbing Selenophene–Diketopyrrolopyrrole‐Based Nonfullerene Acceptor and an Efficiency above 10%

et al. 2020

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A new near‐IR absorbing nonfullerene acceptor (NFA), MPU4, is synthesized in three steps from an accessible selenophene–diketopyrrolopyrrole and rhodanine. The high planarity of the molecule and the extended conjugation determine that the new NFA presents a high optical absorption coefficient and a narrow bandgap. In thin films, MPU4 shows broad absorption in the visible and near‐IR regions from 550 to 930 nm. When blended with a phenothiazine‐based small‐molecule (SM) donor, SM1, the resulting additive‐free binary organic solar cell (OSC) exhibits an efficiency of 8.96% with a high open‐circuit voltage (Voc) of 0.99 V and a short‐circuit current (Jsc) of 14.91 mA cm−2 with a remarkably low energy loss (Eloss) of 0.42 eV. This efficiency is significantly higher (24%) than that achieved with an analogous device with a thiophene‐containing NFA (MPU1, 7.22%) instead of MPU4. Importantly, ternary solar cells prepared with SM1 as the donor and MPU4 and PC71BM as acceptors afford, after solvent vapor annealing, an efficiency of 10.04% with a Voc of 0.92 V, Jsc of 16.32 mA cm−2, fill factor of 0.67, and Eloss of 0.49 eV. These results demonstrate the advantages of using selenophene instead of thiophene in SM OSCs.

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Section: Resultssupporting

confidence: 84%

Ternary Organic Solar Cell with a Near‐Infrared Absorbing Selenophene–Diketopyrrolopyrrole‐Based Nonfullerene Acceptor and an Efficiency above 10%

et al. 2020

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“…NFA fluorination has triggered intense re-search activity to achieve higher PCE, demonstrated by the graphical trend of the "Best Research-Cell Efficiency Chart" [11] and insightful reviews [12,13]. Further advancements besides chemical tailoring include the use of ternary BHJ systems [14][15][16], in which multiple NFA components are blended together to form an active layer for single junction photovoltaic cells, and the use of tandem multijunction device structures [17]. Simultaneously, efforts are continued to further enhance the spectral absorption range of active materials [18,19].…”

Section: Introductionmentioning

confidence: 99%

Comparing Donor- and Acceptor-Originated Exciton Dynamics in Non-Fullerene Acceptor Blend Polymeric Systems

Kang

Choi

et al. 2021

Polymers

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Non-fullerene type acceptors (NFA) have gained attention owing to their spectral extension that enables efficient solar energy capturing. For instance, the solely NFA-mediated absorbing region contributes to the photovoltaic power conversion efficiency (PCE) as high as ~30%, in the case of the solar cells comprised of fluorinated materials, PBDB-T-2F and ITIC-4F. This implies that NFAs must be able to serve as electron donors, even though they are conventionally assigned as electron acceptors. Therefore, the pathways of NFA-originated excitons need to be explored by the spectrally resolved photovoltaic characters. Additionally, excitation wavelength dependent transient absorption spectroscopy (TAS) was performed to trace the nature of the NFA-originated excitons and polymeric donor-originated excitons separately. Unique origin-dependent decay behaviors of the blend system were found by successive comparing of those solutions and pristine films which showed a dramatic change upon film formation. With the obtained experimental results, including TAS, a possible model describing origin-dependent decay pathways was suggested in the framework of reaction kinetics. Finally, numerical simulations based on the suggested model were performed to verify the feasibility, achieving reasonable correlation with experimental observables. The results should provide deeper insights in to renewable energy strategies by using novel material classes that are compatible with flexible electronics.

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“…To gain more insight into the effect of thermal treatment, photoinduced current density ( J ph ) was obtained and exciton dissociation probability ( P ( E , T )) was calculated then the following results were summarized in Figure S11 and Table S6 (Supporting Information). In general, P ( E , T ) can be calculated by dividing J ph by J sat where J ph is obtained at V a = 0 V and J sat is extracted from J ph – V eff characteristics [ 33,34 ] ( J ph is J L − J D , where J L is the current density under 1 sun illumination, J D is the current density under dark, and J sat is the saturation current density; V a is the applied bias voltage and V 0 is the voltage when J ph is zero and V eff is V 0 – V a ). As shown in Figure S11a–c (Supporting Information), J ph values of all the three acceptor‐based devices gradually decreased; moreover, saturation region also diminished under thermal stress.…”

Section: Resultsmentioning

confidence: 99%

Thermally Durable Nonfullerene Acceptor with Nonplanar Conjugated Backbone for High‐Performance Organic Solar Cells

Cho

Park

et al. 2020

Advanced Energy Materials

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A nonfullerene acceptor (NFA) with acceptor–donor–acceptor (A–D–A) architecture, i‐IEICO‐2F, based on 4,9‐dihydro‐s‐indaceno[1,2‐b:5,6‐b′]dithiophene as an electron‐donating core and 2‐(6‐fluoro‐2,3‐dihydro‐3‐oxo‐1H‐inden‐1‐ylidene)‐propanedinitrile as electron‐withdrawing end groups, is designed and synthesized. i‐IEICO‐2F has a twist structure in the main conjugated chain, which causes blueshifted absorption and leads to harmonious absorption with a high bandgap donor. The bandgap of i‐IEICO‐2F compliments the bandgap of suitable wide bandgap donor polymers such as J52, leading to complete light absorption throughout the visible spectrum. Devices based on i‐IEICO‐2F exhibit optimized photovoltaic performance including an open‐circuit voltage of 0.93 V, a short‐circuit current density of 16.61 mA cm−2, and a fill factor of 73%, and result in a power conversion efficiency (PCE) of 11.28%. The i‐IEICO‐2F‐based devices reach PCEs of >11% without using any additives or post‐treatments. Devices are found to be thermally stable and maintain 44% of their initial PCE after 184.5 h of continuous thermal annealing (TA) treatment at 150 °C. Based on UV, atomic force microscopy (AFM), and grazing incidence wide angle X‐ray scattering (GIWAXS) results, i‐IEICO‐2F devices show almost identical morphology and molecular orientation throughout the TA treatment and excellent stability compared to other IEICO derivatives.

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Ternary Organic Solar Cells Based on a Wide-Bandgap Polymer with Enhanced Power Conversion Efficiencies

Cited by 40 publications

References 36 publications

Ternary Organic Solar Cell with a Near‐Infrared Absorbing Selenophene–Diketopyrrolopyrrole‐Based Nonfullerene Acceptor and an Efficiency above 10%

Ternary Organic Solar Cell with a Near‐Infrared Absorbing Selenophene–Diketopyrrolopyrrole‐Based Nonfullerene Acceptor and an Efficiency above 10%

Comparing Donor- and Acceptor-Originated Exciton Dynamics in Non-Fullerene Acceptor Blend Polymeric Systems

Thermally Durable Nonfullerene Acceptor with Nonplanar Conjugated Backbone for High‐Performance Organic Solar Cells

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