Ultrasensitive Photodetectors: Ultrahigh Responsivity Photodetectors of 2D Covalent Organic Frameworks Integrated on Graphene (Adv. Mater. 9/2020)

Xiong, Yifeng; Liao, Qiaobo; Huang, Zhaocong; Huang, Xin; Ke, Can; Zhu, Hengtian; Dong, Chenyu; Wang, Haoshang; Xi, Kai; Zhan, Peng; Xu, Fei; Lu, Yanqing

doi:10.1002/adma.202070070

Cited by 10 publications

(9 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Owing to their high charge carrier mobility, AntTTH films exhibited a strong light response, even in room light, with a bias voltage of 1 V, and the on–off switching of the photocurrent can be observed many times even under very low light power in the complete UV–vis spectrum, without graphene or any other charge transporting layer (Figure f). , These properties make it a potential organic material for photodetector applications. However, with the same bias voltage, no photoresponsivity was observed for AntTTF due to the large resistance of the film.…”

Section: Resultssupporting

confidence: 78%

“…To date, a number of semiconducting COFs have been developed carrying π-conjugated building blocks and linkers and applied in the fields of photovoltaics, , transistors, photodetectors, chemiresistive sensing, thermoelectric, and photo- and electrocatalysis. − The performance of these devices strongly depends on the conductivity and intrinsic charge carrier mobility of the COFs. The charge carrier mobility of the COFs has been estimated using various contact (two/four probes, time-of-flight, hall effect, field effect transistors) and non-contact [time-resolved microwave conductivity (TRMC) and time-resolved terahertz spectroscopy] methods, and few of the π-conjugated COFs were observed to exhibit high intrinsic charge carrier mobility (∼8.1 cm 2 V –1 s –1 ), and high conductivity (∼10 –2 S cm –1 ) upon doping.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Band-like Transport of Charge Carriers in Oriented Two-Dimensional Conjugated Covalent Organic Frameworks

et al. 2022

View full text Add to dashboard Cite

A tunable topology and a porous network make π-conjugated covalent organic frameworks (COFs) a new class of organic semiconductors for optoelectronic, smart sensing, and catalytic applications. Although some of the COFs exhibit enhanced electric conductivity with a high charge carrier mobility, the nature and pathways of charge transport still remain elusive. In order to unveil the transport mechanism, herein, we have developed crystalline π-conjugated COFs using planar building blocks, and a wafer-scale self-supporting thin film was grown, which could be transferred onto any of the desired substrates. The COF film was found to be highly oriented and exhibited a high in-plane electronic conductivity. The conductivity was almost independent of temperature with an ultra-low activation energy of 14.3 meV, approaching a band-like transport of charge carriers within the crystalline domains. The COF films also showed a high photoresponsivity in electronic conduction against a complete visible range, demonstrated as a flexible photodetector device. This work represents a thorough investigation of the mechanism and direction of charge transport in crystalline π-conjugated COF semiconductors, which suggests their feasibility as key active materials in multi-functional organic electronics.

show abstract

Section: Resultssupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Band-like Transport of Charge Carriers in Oriented Two-Dimensional Conjugated Covalent Organic Frameworks

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Growing crystalline COF films at confined interfaces facilitated their integration into device-relevant settings such as field-effect transistors and photodetector devices. − Recently, an ultrathin 2D imine polymer film constructed from benzene-1,3,5-tricarbaldehyde and p -phenylenediamine was reported by Hu and Lei for a sandwiched nonvolatile memristor based on the filament conductive mechanism, taking advantages of the porous structure of the 2D polymer . Park et al reported the surfactant-assisted interfacial synthesis of crystalline 2D boronate ester COF films as the pseudo-gate for emulating the synaptic plasticity with a silicon nanowire field-effect transistor in a neuromorphic memory device .…”

Section: Introductionmentioning

confidence: 99%

Resistive Switching Memory Performance of Two-Dimensional Polyimide Covalent Organic Framework Films

Sun

Feng

et al. 2020

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Two-dimensional polyimide covalent organic framework (2D PI-NT COF) films were constructed on indium-tin-oxide (ITO)-coated glass substrates to fabricate two-terminal sandwiched resistive memory devices. The 2D PI-NT COF films condensated from the reaction between 4,4',4''triaminotriphenylamine and naphthalene-1,4,5,8-tetracarboxylic dianhydride under solvothermal conditions demonstrated high crystallinity, good orientation preference, tunable thickness, and low surface roughness. The well-aligned electron donor (triphenylamine unit) and acceptor (naphthalene diimide unit) arrays rendered the 2D PI-NT COF film a promising candidate for electronic applications. The memory devices based on the 2D PI-NT COF films exhibited the typical write-once-read-many-time resistive switching behavior under the operating voltage of +2.30 V on the positive scan and -2.64 V on the negative scan. A high ON/OFF current ratio (>10 6 for the positive scan and 10 4 ~10 6 for the negative scan) and long-term retention time indicated the high fidelity, low error, and high stability of the resistive memory devices. The memory behavior was attributed to an electric field-induced intramolecular charge transfer in the ordered donor-acceptor system which provided the effective charge transfer channels for injected charge carriers. This work represents the first example that explores the resistive memory properties of 2D PI-COF films, shedding light on the potential application of 2D COFs as information storage media.

show abstract

“…These HP-COFs had relatively small bandgaps, steep onset absorption peaks, and broad spectral absorption ranging from ultraviolet to visible light, making them promising candidates for photovoltaic applications. In 2020, Xiong and his coworkers [64] synthesized hierarchically porous photosensitive 2D COFs in situ with highly ordered donor-acceptor topology on graphene by choosing photoactive tetraphenylethylene monomers. Ultimately, a HP-COF-graphene heterojunction, COF-ETBC-TAPT was successfully fabricated and used to create an ultra-sensitive optoelectronic detector.…”

Section: Optoelectronic Applicationsmentioning

confidence: 99%

Hierarchically Porous Covalent Organic Frameworks: Synthesis Methods and Applications

Wang,

Mu,

Shao

et al. 2024

Chemistry A European J

View full text Add to dashboard Cite

Covalent organic frameworks (COFs) with high porosity have garnered considerable interest for various applications owing to their robust and customizable structure. However, conventional COFs are hindered by their narrow pore size, which poses limitations for applications such as heterogeneous catalysis and guest delivery that typically involve large molecules. The development of hierarchically porous COF (HP‐COF), featuring a multi‐scale aperture distribution, offers a promising solution by significantly enhancing the diffusion capacity and mass transfer for larger molecules. This review focuses on the recent advances in the synthesis strategies of HP‐COF materials, including topological structure design, in‐situ templating, monolithic COF synthesis, defect engineering, and crystalline self‐transformation. The specific operational principles and affecting factors in the synthesis process are summarized and discussed, along with the applications of HP‐COFs in heterogeneous catalysis, toxic component treatment, optoelectronics, and the biomedical field. Overall, this review builds a bridge to understand HP‐COFs and provides guidance for further development of them on synthesis strategies and applications.

show abstract

Ultrasensitive Photodetectors: Ultrahigh Responsivity Photodetectors of 2D Covalent Organic Frameworks Integrated on Graphene (Adv. Mater. 9/2020)

Cited by 10 publications

References 0 publications

Band-like Transport of Charge Carriers in Oriented Two-Dimensional Conjugated Covalent Organic Frameworks

Band-like Transport of Charge Carriers in Oriented Two-Dimensional Conjugated Covalent Organic Frameworks

Resistive Switching Memory Performance of Two-Dimensional Polyimide Covalent Organic Framework Films

Hierarchically Porous Covalent Organic Frameworks: Synthesis Methods and Applications

Contact Info

Product

Resources

About