Low-Bandgap Near-IR Conjugated Polymers/Molecules for Organic Electronics

Dou, Letian; Liu, Yongsheng; Hong, Ziruo; Li, Gang; Yang, Yang

doi:10.1021/acs.chemrev.5b00165

Cited by 1,086 publications

(850 citation statements)

References 238 publications

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“…Closely related alternating donor/acceptor units along the backbones of conjugated copolymers have proven beneficial for achieving promising optoelectronic functionality. 4,5,23 This particular combination yields a reduction in the band gap when compared to other substitution patterns. The details of the synthesis will be published elsewhere.…”

Section: Resultsmentioning

confidence: 97%

Temperature-Dependent Detectivity of Near-Infrared Organic Bulk Heterojunction Photodiodes

Yao

London

et al. 2017

ACS Appl. Mater. Interfaces

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Bulk heterojunction photodiodes are fabricated using a new donor−acceptor polymer with a near-infrared absorption edge at 1.2 μm, achieving a detectivity up to 10 12 Jones at a wavelength of 1 μm and an excellent linear dynamic range of 86 dB. The photodiode detectivity is maximized by operating at zero bias to suppress dark current, while a thin 175 nm active layer is used to facilitate charge collection without reverse bias. Analysis of the temperature dependence of the dark current and spectral response demonstrates a 2.8-fold increase in detectivity as the temperature was lowered from 44 to −12°C , a relatively small change when compared to that of inorganic-based devices. The near-infrared photodiode shows a switching speed reaching up to 120 μs without an external bias. An application using our NIR photodiode to detect arterial pulses of a fingertip is demonstrated.

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Section: Resultsmentioning

confidence: 97%

Temperature-Dependent Detectivity of Near-Infrared Organic Bulk Heterojunction Photodiodes

Yao

London

et al. 2017

ACS Appl. Mater. Interfaces

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“…These semiconducting copolymers usually exhibit much less absorption in the visible range compared with other typical midbandgap polymers because of their red-shifted π-π* absorption spectrum, which exhibits strong absorption in the near-infrared (IR) region (11) ), despite their relatively low crystalline order (12)(13)(14). However, because of their high optical density, even for ultrathin films (thickness t < 100 nm), it remains difficult to obtain fully transparent and colorless thin films using copolymers of this type.…”

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confidence: 99%

Optically transparent semiconducting polymer nanonetwork for flexible and transparent electronics

Park

Kim

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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Simultaneously achieving high optical transparency and excellent charge mobility in semiconducting polymers has presented a challenge for the application of these materials in future "flexible" and "transparent" electronics (FTEs). Here, by blending only a small amount (∼15 wt %) of a diketopyrrolopyrrole-based semiconducting polymer (DPP2T) into an inert polystyrene (PS) matrix, we introduce a polymer blend system that demonstrates both high field-effect transistor (FET) mobility and excellent optical transparency that approaches 100%. We discover that in a PS matrix, DPP2T forms a web-like, continuously connected nanonetwork that spreads throughout the thin film and provides highly efficient 2D charge pathways through extended intrachain conjugation. The remarkable physical properties achieved using our approach enable us to develop prototype high-performance FTE devices, including colorless all-polymer FET arrays and fully transparent FET-integrated polymer light-emitting diodes.semiconducting polymer | organic electronics | flexible and transparent device | polymer blend | charge transport O ptically transparent and mechanically flexible circuitries have long been desired for next-generation electronics requiring unprecedented features, such as "see-through" visibility, deformability, and even skin-attachable functionality for health care systems (1-3). This new paradigm for electronic applications has motivated researchers to eagerly pursue new innovative semiconducting materials, and one promising candidate is the class of materials called semiconducting conjugated polymers (4). Their unique benefits, including mechanical flexibility, light weight, and processing advantages based on high-throughput fabrication processes using solution-printing technologies, have accelerated the development of these materials as key building blocks for next-generation ubiquitous systems (2, 5, 6). Nevertheless, these materials still cannot fulfill the ultimate requirements for future "flexible" and "transparent" electronics (FTEs). Together with their inferior charge-carrier mobility because of conformational and energetic disorder (7), their high light absorption in the visible range, which is inherent to this class of materials (absorption coefficient ∼10 5 cm −1 ) (8), makes it difficult to apply these materials in FTEs. Indeed, despite extensive investigations seeking a suitable model system for FTEs by varying the polymer-structure design and the processing techniques used, the simultaneous achievement of optical transparency and high mobility in semiconducting polymers remains a formidable challenge (9, 10).Among the various types of semiconducting polymers, lowbandgap polymers using the donor-acceptor (D-A) copolymerization scheme are promising candidate materials for FTE applications. These semiconducting copolymers usually exhibit much less absorption in the visible range compared with other typical midbandgap polymers because of their red-shifted π-π* absorption spectrum, which exhibits strong absorption in the ne...

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“…In principle process, the photogenerated excitons formed at the D/A interface dissociate into bound electron-hole pairs forming charge transfer, which drift to be collected at separate electrodes to generate current. Cooperatively, these processes including the critical parameters to impact the performance of OPV calibrate the PCE of BHJ device [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Theoretical Approach Towards Rational Design and Characterization of Benzo[1,2-b:5-B’]dithiophene (BDT)-Based (A-D-A) Small Molecules of Relevance for High Performance Solar Cells

Khlaifia¹,

Mestiri²,

Mabrouk³

et al. 2018

J Material Sci Eng

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Benzo[1,2-b:5-B']dithiophene (BDT)-based small molecules with acceptor-donor-acceptor (A-D-A) structure were designed based on the experimental system BDTT-S-TR (1) for use as potential donor materials for organic photovoltaic (OPV) devices. Their geometry structures, electronic properties and other key parameters related to OPVs such as absorption spectra, energetic driving forces for the 2-4/PC 70 BM heterojunctions are ~10 4 times higher than that of the 1/PC 70 BM. From these predictions, we reached our purpose to provide rational design of three novel molecules that will be more promising candidates for high-efficiency SMs OPVs materials.

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Low-Bandgap Near-IR Conjugated Polymers/Molecules for Organic Electronics

Cited by 1,086 publications

References 238 publications

Temperature-Dependent Detectivity of Near-Infrared Organic Bulk Heterojunction Photodiodes

Temperature-Dependent Detectivity of Near-Infrared Organic Bulk Heterojunction Photodiodes

Optically transparent semiconducting polymer nanonetwork for flexible and transparent electronics

Theoretical Approach Towards Rational Design and Characterization of Benzo[1,2-b:5-B’]dithiophene (BDT)-Based (A-D-A) Small Molecules of Relevance for High Performance Solar Cells

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