The light detection performance of the Al/DCJTB/n-Si Schottky type photodetector for a wide-range spectrum

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dc.contributor.authorManfo, Theodore Azemtsop
dc.contributor.authorYildiz, Dilber Esra
dc.contributor.authorHussaini, Ali Akbar
dc.contributor.authorYildirim, Murat
dc.contributor.authorGunduz, Bayram
dc.date.accessioned2026-06-19T06:39:45Z
dc.date.available2026-06-19T06:39:45Z
dc.date.issued2026
dc.departmentMalatya Turgut Özal Üniversitesi
dc.description.abstractThe 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB) is a red fluorescent dye known for its high luminescence efficiency, color purity, and resistance to concentration quenching. DCJTB was applied as an interfacial layer between Si and Al via spin coating to investigate its effect on Schottky photodetector performance at various light intensities and wavelengths (UV-Vis-NIR). Structural and optical properties of the DCJTB layer were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and ultraviolet-visible (UV-vis) spectroscopy. Current-voltage (I-V) and current-time (I-t) measurements revealed that the Al/DCJTB/n-Si heterojunction exhibits an ideality factor (n) of 3.15 and a barrier height (Phi b) of 0.701 eV under dark conditions. With increasing illumination (20-100 mW/cm2), n varied from 3.884 to 3.077, while the barrier height increased slightly. The device achieved a responsivity (R) of 0.63 A/W and a specific detectivity of 1.63 x 1010 Jones under sunlight. The external quantum efficiency (EQE) reached 0.68 % at 550 nm, confirming high sensitivity in the green region, while performance declined beyond 700 nm. These findings demonstrate that the Al/DCJTB/n-Si heterojunction is most effective in the visible spectrum, making it promising for optoelectronic and photodetection applications.
dc.identifier.doi10.1016/j.optmat.2025.117688
dc.identifier.issn0925-3467
dc.identifier.issn1873-1252
dc.identifier.orcid0000-0002-4541-3752
dc.identifier.orcid0000-0002-7128-9994
dc.identifier.orcid0000-0002-9043-3111
dc.identifier.orcid0000-0002-1447-7534
dc.identifier.orcid0000-0003-2212-199X
dc.identifier.scopus2-s2.0-105022832899
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1016/j.optmat.2025.117688
dc.identifier.urihttps://hdl.handle.net/20.500.12899/5762
dc.identifier.volume169
dc.identifier.wosWOS:001611295200004
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier
dc.relation.ispartofOptical Materials
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WOS_20260612
dc.subjectDcjtb
dc.subjectSchottky Photodetector
dc.subjectResponsivity
dc.subjectExternal Quantum Efficiency
dc.titleThe light detection performance of the Al/DCJTB/n-Si Schottky type photodetector for a wide-range spectrum
dc.typeArticle

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