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Article: A Bilayer 2D-WS2/Organic-Based Heterojunction for High-Performance Photodetectors

TitleA Bilayer 2D-WS2/Organic-Based Heterojunction for High-Performance Photodetectors
Authors
Keywords2D-WS2
photodetector
organic semiconductor
responsivity
Issue Date2019
PublisherMDPIAG. The Journal's web site is located at http://www.mdpi.com/journal/nanomaterials
Citation
Nanomaterials, 2019, v. 9 n. 9, p. article no. 1312 How to Cite?
AbstractTwo-dimensional (2D) tungsten disulfide (WS2) has inspired great efforts in optoelectronics, such as in solar cells, light-emitting diodes, and photodetectors. However, chemical vapor deposition (CVD) grown 2D WS2 domains with the coexistence of a discontinuous single layer and multilayers are still not suitable for the fabrication of photodetectors on a large scale. An emerging field in the integration of organic materials with 2D materials offers the advantages of molecular diversity and flexibility to provide an exciting aspect on high-performance device applications. Herein, we fabricated a photodetector based on a 2D-WS2/organic semiconductor materials (mixture of the (Poly-(N,N′-bis-4-butylphenyl-N,N′-bisphenyl) benzidine and Phenyl-C61-butyric acid methyl ester (Poly-TPD/PCBM)) heterojunction. The application of Poly-TPD/PCBM organic blend film enhanced light absorption, electrically connected the isolated WS2 domains, and promoted the separation of electron-hole pairs. The generated exciton could sufficiently diffuse to the interface of the WS2 and the organic blend layers for efficient charge separation, where Poly-TPD was favorable for hole carrier transport and PCBM for electron transport to their respective electrodes. We show that the photodetector exhibited high responsivity, detectivity, and an on/off ratio of 0.1 A/W, 1.1 × 1011 Jones, and 100, respectively. In addition, the photodetector showed a broad spectral response from 500 nm to 750 nm, with a peak external quantum efficiency (EQE) of 8%. Our work offers a facile solution-coating process combined with a CVD technique to prepare an inorganic/organic heterojunction photodetector with high performance on silicon substrate.
Persistent Identifierhttp://hdl.handle.net/10722/278197
ISSN
2017 Impact Factor: 3.504

 

DC FieldValueLanguage
dc.contributor.authorHuang, F-
dc.contributor.authorLi, JZ-
dc.contributor.authorXu, ZH-
dc.contributor.authorLiu, Y-
dc.contributor.authorLuo, RP-
dc.contributor.authorZhang, SW-
dc.contributor.authorNie, PB-
dc.contributor.authorLv, YF-
dc.contributor.authorZhao, SX-
dc.contributor.authorSu, WT-
dc.contributor.authorLi, WD-
dc.contributor.authorZhao, SC-
dc.contributor.authorWei, GD-
dc.contributor.authorKuo, HC-
dc.contributor.authorKang, FY-
dc.date.accessioned2019-10-04T08:09:21Z-
dc.date.available2019-10-04T08:09:21Z-
dc.date.issued2019-
dc.identifier.citationNanomaterials, 2019, v. 9 n. 9, p. article no. 1312-
dc.identifier.issn2079-4991-
dc.identifier.urihttp://hdl.handle.net/10722/278197-
dc.description.abstractTwo-dimensional (2D) tungsten disulfide (WS2) has inspired great efforts in optoelectronics, such as in solar cells, light-emitting diodes, and photodetectors. However, chemical vapor deposition (CVD) grown 2D WS2 domains with the coexistence of a discontinuous single layer and multilayers are still not suitable for the fabrication of photodetectors on a large scale. An emerging field in the integration of organic materials with 2D materials offers the advantages of molecular diversity and flexibility to provide an exciting aspect on high-performance device applications. Herein, we fabricated a photodetector based on a 2D-WS2/organic semiconductor materials (mixture of the (Poly-(N,N′-bis-4-butylphenyl-N,N′-bisphenyl) benzidine and Phenyl-C61-butyric acid methyl ester (Poly-TPD/PCBM)) heterojunction. The application of Poly-TPD/PCBM organic blend film enhanced light absorption, electrically connected the isolated WS2 domains, and promoted the separation of electron-hole pairs. The generated exciton could sufficiently diffuse to the interface of the WS2 and the organic blend layers for efficient charge separation, where Poly-TPD was favorable for hole carrier transport and PCBM for electron transport to their respective electrodes. We show that the photodetector exhibited high responsivity, detectivity, and an on/off ratio of 0.1 A/W, 1.1 × 1011 Jones, and 100, respectively. In addition, the photodetector showed a broad spectral response from 500 nm to 750 nm, with a peak external quantum efficiency (EQE) of 8%. Our work offers a facile solution-coating process combined with a CVD technique to prepare an inorganic/organic heterojunction photodetector with high performance on silicon substrate.-
dc.languageeng-
dc.publisherMDPIAG. The Journal's web site is located at http://www.mdpi.com/journal/nanomaterials-
dc.relation.ispartofNanomaterials-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subject2D-WS2-
dc.subjectphotodetector-
dc.subjectorganic semiconductor-
dc.subjectresponsivity-
dc.titleA Bilayer 2D-WS2/Organic-Based Heterojunction for High-Performance Photodetectors-
dc.typeArticle-
dc.identifier.emailLi, WD: liwd@hku.hk-
dc.identifier.authorityLi, WD=rp01581-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.3390/nano9091312-
dc.identifier.scopuseid_2-s2.0-85073378920-
dc.identifier.hkuros306128-
dc.identifier.volume9-
dc.identifier.issue9-
dc.identifier.spagearticle no. 1312-
dc.identifier.epagearticle no. 1312-
dc.publisher.placeSwitzerland-

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