P3HT-based visible-light organic photodetectors using PEI/PAA multilayers as a p-type buffer layer

Ji, Chan Hyuk; Lee, Seon Ju; Oh, Se Young

doi:10.1039/c9ra08568h

Cited by 9 publications

(7 citation statements)

References 54 publications

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“…Here, the typical values of LUMO (−3.0 eV) and HOMO (−5.0 eV) levels of P3HT and the valence band (−5.3 eV) and conduction band (−4.0 eV) levels of layered WSe 2 have been considered, in accordance with which, the WSe 2 /P3HT HJ is expected to have a type-II band alignment. [49,50] The layered WSe 2 flake with an average thickness of 25 nm can be deemed as a semiconductor with a bandgap of 1.3 eV. Due to the unregulated thickness gradient across the exfoliated WSe 2 flake, some portions of it also show characteristics pertaining to 3L or 4L, which support direct electronic transitions.…”

Section: Discussionmentioning

confidence: 99%

High‐Performance Air‐Stable 2D‐WSe₂/P3HT Based Inorganic–Organic Hybrid Photodetector with Broadband Visible to Near‐IR Light Detection

Khanikar,

Dewan,

John

et al. 2023

Adv Elect Materials

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Photodetectors that can achieve high‐speed photoresponse and high responsivity with broadband detection are essential for bio‐health monitoring, imaging, chemical sensing, and many other applications. Herein a high‐performance inorganic–organic hybrid photodetector based on a heterojunction of exfoliated 2D tungsten diselenide (WSe2) layers and solution‐processable poly(3‐hexylthiophene‐2,5‐diyl), P3HT is reported. The heterojunction shows enhanced exciton harvesting through long‐range energy transfer from P3HT to WSe2, which is confirmed using photoluminescence quenching and fluorescence decay measurements. The detector shows broadband light detection from visible to near‐infrared (NIR) (400−1100 nm), and air‐stable device performance. The device exhibits the highest responsivity of 17.6 AW−1 for low incident light intensity (<10−5 W cm−2) at 640 nm wavelength of light. Furthermore, a fast photoresponse speed with a rise/fall time of 9.5/5.1 µs, which retained its performance for more than four months under ambient conditions is demonstrated. The superior device performance presented here using an inorganic–organic hybrid heterojunction is the key to producing novel high‐performance and air‐stable photodetectors with broad spectral bandwidth.

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Section: Discussionmentioning

confidence: 99%

High‐Performance Air‐Stable 2D‐WSe₂/P3HT Based Inorganic–Organic Hybrid Photodetector with Broadband Visible to Near‐IR Light Detection

Khanikar,

Dewan,

John

et al. 2023

Adv Elect Materials

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“…Thus, there is a demand to create antimicrobial drug carriers that securely attach to moist tissues. Polyethyleneimine/polyacrylic acid (PEA) hydrogel formed through the physical cross-linking of polyethyleneimine and polyacrylic acid has been extensively studied as potential biomaterials and gene delivery vehicles (Ji et al, 2019;Li et al, 2021). It possesses advantageous properties such as superior adhesion, elasticity, self-healing, biocompatibility, and in situ gel formation.…”

Section: Introductionmentioning

confidence: 99%

Antibacterial and anti-inflammatory polyethyleneimine/polyacrylic acid hydrogel loaded with CeO2 quantum dots for wet tissue wound dressings

Hou,

Lin,

Xia

et al. 2024

Front. Mater.

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Searching for an antibacterial and anti-inflammatory dressing that can stably adhere to wet tissues remains a momentous clinical challenge, especially in the context of treatment failure due to multi-drug-resistant bacteria. Using a hard template method in combination with an in situ chelating strategy, three-dimensional nitrogen-doped graded porous carbon anchored 1.5–2.5 nm CeO2 quantum dots (CeO2-QDs) were tailor-designed in this study. Using the size effect, CeO2-QDs have a higher percentage of Ce3+ and oxygen vacancies that could amplify their antibacterial effects. Polyethyleneimine/polyacrylic acid (PEA) powder could self-gel and be adhesive due to its strong physical interactions, which make it an ideal carrier for CeO2-QDs. PEA@50 (mg/mL) CeO2-QDs hydrogel and PEA@75 (mg/mL) CeO2-QDs hydrogel with moderate doses of CeO2-QDs show a superior antibacterial effect against Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) strains. Furthermore, PEA@50CeO2-QDs hydrogels possess excellent anti-inflammatory capacity through their antioxidant activity, which could promote macrophage M2 phenotype polarization. More importantly, cytotoxicity assays on L929 fibroblasts show that PEA@CeO2-QDs hydrogels have no significant toxicity, and a significant proliferative effect could be observed. Overall, PEA@50CeO2-QDs hydrogels have the potential to become a multifunctional wet tissue dressing with anti-inflammatory and antiseptic properties to promote the healing of infected wounds.

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“…However, they are difficult to operate in a normal environment because of their inflexibility and cryogenic properties. Organic semiconductor-based photodetectors, such as P3HT, , PCBM, , and pentacene, have the advantage of high flexibility, but their low carrier mobility caused by the excitation nature and structural disorder leads to low responsivity. Therefore, to integrate photodetectors and devices into a flexible chip, material selection, space usage, and sensing efficiency need to be considered.…”

Section: Introductionmentioning

confidence: 99%

Embedded Integration of Sb₂Se₃ Film by Low-Temperature Plasma-Assisted Chemical Vapor Reaction with Polycrystalline Si Transistor for High-Performance Flexible Visible-to-Near-Infrared Photodetector

et al. 2023

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Flexible optoelectronics have garnered considerable interest for applications such as optical communication, motion capture, biosignal detection, and night vision. Transitionmetal dichalcogenides are widely used as flexible photodetectors owing to their outstanding electrical and optical properties and high flexibility. Herein, a two-dimensional (2D) Sb 2 Se 3 filmbased one transistor−one resistor (1T1R) flexible photodetector with high photosensing current and detection ranges from visible to near-infrared was developed. The flexible 1T1R was fabricated using an efficient field-effect transistor platform with the 2D Sb 2 Se 3 film directly deposited on the sensing region using a lowtemperature plasma-assisted chemical vapor reaction. The photodetector could achieve a maximum I photo /I dark of 15,000 under white light with a power density of 26 mW/cm 2 , in which the photodetector showed quick rising and falling response times of 0.16 and 0.28 s, respectively. The 2D Sb 2 Se 3 film exhibits broadband absorption in the visible and IR regions, yielding an excellent photoresponse under laser illumination with different wavelengths. To investigate the flexibility and stability of the 1T1R photodetector, the photoresponses were measured under different bending cycles and curvatures, which maintained its functions and exhibited high stability under convex and concave bending at a curvature radius of 20 mm.

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P3HT-based visible-light organic photodetectors using PEI/PAA multilayers as a p-type buffer layer

Abstract: Although PEI/PAA multilayers are insulators, when used as a p-type buffer layer in organic photodetector, they suppressed the leakage current and also provided a high photocurrent due to the light-assisted tunneling effect.

Cited by 9 publications

References 54 publications

High‐Performance Air‐Stable 2D‐WSe₂/P3HT Based Inorganic–Organic Hybrid Photodetector with Broadband Visible to Near‐IR Light Detection

High‐Performance Air‐Stable 2D‐WSe₂/P3HT Based Inorganic–Organic Hybrid Photodetector with Broadband Visible to Near‐IR Light Detection

Antibacterial and anti-inflammatory polyethyleneimine/polyacrylic acid hydrogel loaded with CeO2 quantum dots for wet tissue wound dressings

Embedded Integration of Sb₂Se₃ Film by Low-Temperature Plasma-Assisted Chemical Vapor Reaction with Polycrystalline Si Transistor for High-Performance Flexible Visible-to-Near-Infrared Photodetector

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P3HT-based visible-light organic photodetectors using PEI/PAA multilayers as a p-type buffer layer

Abstract: Although PEI/PAA multilayers are insulators, when used as a p-type buffer layer in organic photodetector, they suppressed the leakage current and also provided a high photocurrent due to the light-assisted tunneling effect.

Cited by 9 publications

References 54 publications

High‐Performance Air‐Stable 2D‐WSe2/P3HT Based Inorganic–Organic Hybrid Photodetector with Broadband Visible to Near‐IR Light Detection

High‐Performance Air‐Stable 2D‐WSe2/P3HT Based Inorganic–Organic Hybrid Photodetector with Broadband Visible to Near‐IR Light Detection

Antibacterial and anti-inflammatory polyethyleneimine/polyacrylic acid hydrogel loaded with CeO2 quantum dots for wet tissue wound dressings

Embedded Integration of Sb2Se3 Film by Low-Temperature Plasma-Assisted Chemical Vapor Reaction with Polycrystalline Si Transistor for High-Performance Flexible Visible-to-Near-Infrared Photodetector

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High‐Performance Air‐Stable 2D‐WSe₂/P3HT Based Inorganic–Organic Hybrid Photodetector with Broadband Visible to Near‐IR Light Detection

High‐Performance Air‐Stable 2D‐WSe₂/P3HT Based Inorganic–Organic Hybrid Photodetector with Broadband Visible to Near‐IR Light Detection

Embedded Integration of Sb₂Se₃ Film by Low-Temperature Plasma-Assisted Chemical Vapor Reaction with Polycrystalline Si Transistor for High-Performance Flexible Visible-to-Near-Infrared Photodetector