An All‐Small‐Molecule Organic Solar Cell with High Efficiency Nonfullerene Acceptor

Kwon, Oh Nam; Park, Jung-Hwa; Kim, Dong Won; Park, Soo Young

doi:10.1002/adma.201405429

Cited by 188 publications

(109 citation statements)

References 51 publications

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“…As shown in Figure (AFM), the surface roughness of the isomer blend films increases in the order D5T2F‐P:IDIC‐4F (2.43 nm), D5T2F‐S:IDIC‐4F (3.03 nm), and D5T2F‐T:IDIC‐4F (4.68 nm). Roughness is not a direct measurement of film crystallinity, but it has been reported that a rough surface indicates better crystallinity in the bulk material below . The higher surface roughness of the D5T2F‐T:IDIC‐4F blend film may affect the extent of contact between the active layer and the electrode .…”

Section: Resultsmentioning

confidence: 99%

Difluorinated Oligothiophenes for High‐Efficiency All‐Small‐Molecule Organic Solar Cells: Positional Isomeric Effect of Fluorine Substitution on Performance Variations

et al. 2020

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Three symmetrically difluorinated organic semiconductors (namely D5T2F‐P, D5T2F‐S, and D5T2F‐T) containing rhodanine‐flanked pentathiophene structures are synthesized and used as donors in all‐small‐molecule organic solar cells (ASM‐OSCs) prepared with the small‐molecule acceptor 2,2′‐((2Z,2′Z)‐((4,4,9,9‐tetrahexyl‐4,9‐dihydro‐s‐indaceno[1,2‐b:5,6‐b′]dithiophene‐2,7‐diyl)bis(methanylylidene))bis(5,6‐difluoro‐3‐oxo‐2,3‐dihydro‐1H‐indene‐2,1‐diylidene))dimalononitrile (IDIC‐4F). The different substitutional positions of fluorine atoms (–F) in the conjugated backbone of the donor molecule lead to various material and photovoltaic properties being exhibited. Among the three isomers, the centrally fluorinated D5T2F‐P exhibits a redshifted absorption spectrum, downshifted highest occupied molecular orbital (HOMO) energy level, and improved miscibility with IDIC‐4F in the blend films, all of which result in superior device performance. The power conversion efficiency (PCE) of the ASM‐OSCs based on D5T2F‐P:IDIC‐4F reaches an impressive value of 9.36% with an open‐circuit voltage (VOC) value of 0.86 V and a short‐circuit current density (JSC) value of 16.94 mA cm−2, whereas those of D5T2F‐S (6.11%) and D5T2F‐T (5.42%) are much lower. In comparison, an ASM‐OSC based on the nonfluorinated analogue DRCN5T fabricated under the same conditions exhibits poorer performance (8.03% with IDIC‐4F), revealing 16% enhancement in the PCE achieved through backbone fluorination. The PCE of 9.36% may be one of the highest efficiencies of oligothiophene‐based ASM‐OSCs reported in the literature to date.

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Section: Resultsmentioning

confidence: 99%

Difluorinated Oligothiophenes for High‐Efficiency All‐Small‐Molecule Organic Solar Cells: Positional Isomeric Effect of Fluorine Substitution on Performance Variations

et al. 2020

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“…Nonfullerene (NF)‐polymer solar cells (PSCs) have attracted great attention and achieved great success, and the power conversion efficiencies (PCEs) have reached 10–13% in the past few years . Compared to the fullerene acceptors, the n‐type organic semiconductor (n‐OS) acceptors possess distinctively advantages, such as highly adjustable optical absorption, readily tunable frontier energy levels, low production cost, and large material selections . Among the n‐OS acceptors, the narrow bandgap n‐OS materials with acceptor–donor–acceptor (A–D–A) structure, such as 2,2′‐[[6,6,12,12‐tetrakis(4‐hexylphenyl)‐6,12‐dihydrodithieno[2,3‐d:2′,3′‐d′]‐s‐indaceno[1,2‐b:5,6‐b′]dithiophene‐2,8‐diyl]bis[methylidyne(3‐oxo‐1H‐indene‐2,1(3H)‐diylidene)]]bispropanedinitrile (ITIC) and IDIC, have become the dominated acceptor for the high performance PSCs.…”

Section: Photovoltaic Parameters Of the Pm6:idic (1:1 W/w)‐based Pscsmentioning

confidence: 99%

High‐Performance As‐Cast Nonfullerene Polymer Solar Cells with Thicker Active Layer and Large Area Exceeding 11% Power Conversion Efficiency

et al. 2017

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In this work, a nonfullerene polymer solar cell (PSC) based on a wide bandgap polymer donor PM6 containing fluorinated thienyl benzodithiophene (BDT-2F) unit and a narrow bandgap small molecule acceptor 2,2'-((2Z,2'Z)-((4,4,9,9-tetrahexyl-4,9-dihydro-s-indaceno[1,2-b:5,6-b']dithiophene-2,7-diyl)bis(methanylylidene))bis(3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile (IDIC) is developed. In addition to matched energy levels and complementary absorption spectrum with IDIC, PM6 possesses high crystallinity and strong π-π stacking alignment, which are favorable to charge carrier transport and hence suppress recombination in devices. As a result, the PM6:IDIC-based PSCs without extra treatments show an outstanding power conversion efficiency (PCE) of 11.9%, which is the record value for the as-cast PSC devices reported in the literature to date. Moreover, the device performances are insensitive to the active layer thickness (≈95-255 nm) and device area (0.20-0.81 cm ) with PCEs of over 11%. Besides, the PM6:IDIC-based flexible PSCs with a large device area of 1.25 cm exhibit a high PCE of 6.54%. These results indicate that the PM6:IDIC blend is a promising candidate for future roll-to-roll mass manufacturing and practical application of highly efficient PSCs.

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“…More recently, Park and co‐workers reported novel electron acceptors for solution‐processed BHJ solar cells by incorporating naphthalimide groups in a DCS derivative. The resulting films formed from blends with low molecular weight donors or polymeric donors, showing well intermixed film morphology, balanced charge transport, and a maximum PCE 7.6%,[95c] ( Figure ) which is among the highest observed in nonfullerene polymer solar cells and provides great potential to exceed fullerene‐based devices.…”

Section: Solid‐state: Polycrystalline Powders Single Crystals and Tmentioning

confidence: 99%

Self‐Assembled α‐Cyanostilbenes for Advanced Functional Materials

2017

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In the specific context of condensed media, the significant and increasing recent interest in the α-cyanostilbene (CS) motif [ArCHC(CN)Ar] is relevant. These compounds have shown remarkable optical features in addition to interesting electrical properties, and hence they are recognized as very suitable and versatile options for the development of functional materials. This progress report is focused on current and future use of CS structures and molecular assemblies with the aim of exploring and developing for the next generations of functional materials. A critical selection of illustrative materials that contain the CS motif, including relevant subfamilies such as the dicyanodistyrylbenzene and 2,3,3-triphenylacrylonitrile shows how, driven by the self-assembly of CS blocks, a variety of properties, effects, and possibilities for practical applications can be offered to the scientific community, through different rational routes for the elaboration of advanced materials. A survey is provided on the research efforts directed toward promoting the self-assembly of the solid state (polycrystalline solids, thin films, and single crystals), liquid crystals, nanostructures, and gels with multistimuli responsiveness, and applications for sensors, organic light-emitting diodes, organic field effect transistors, organic lasers, solar cells, or bioimaging purposes.

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An All‐Small‐Molecule Organic Solar Cell with High Efficiency Nonfullerene Acceptor

Cited by 188 publications

References 51 publications

Difluorinated Oligothiophenes for High‐Efficiency All‐Small‐Molecule Organic Solar Cells: Positional Isomeric Effect of Fluorine Substitution on Performance Variations

Difluorinated Oligothiophenes for High‐Efficiency All‐Small‐Molecule Organic Solar Cells: Positional Isomeric Effect of Fluorine Substitution on Performance Variations

High‐Performance As‐Cast Nonfullerene Polymer Solar Cells with Thicker Active Layer and Large Area Exceeding 11% Power Conversion Efficiency

Self‐Assembled α‐Cyanostilbenes for Advanced Functional Materials

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