V. P. Sirkeli, O. Yilmazoglu, A. S. Hajo, N. D. Nedeoglo, D. D. Nedeoglo, F. Küppers, H. L. Hartnagel
{"title":"High Performance ZnSe-Based Metal–Semiconductor–Metal Ultraviolet Photodetectors with Different Schottky Contacts","authors":"V. P. Sirkeli, O. Yilmazoglu, A. S. Hajo, N. D. Nedeoglo, D. D. Nedeoglo, F. Küppers, H. L. Hartnagel","doi":"10.1134/S1063783424601164","DOIUrl":null,"url":null,"abstract":"<p>We report on fabrication and characterization of high-performance ZnSe-based metal–semiconductor–metal (MSM) ultraviolet (UV) photodetectors with different Schottky contacts (Cr/Au, Ni/Au, Ag‑nanowire (Ag-NW)) and device structures (conventional planar contacts, interdigitated contacts, hybrid nanowire contacts). At room temperature, the low values of dark current of 0.71, 0.59, and 0.36 nA at bias voltage of 15 V were achieved for devices with Cr/Au, Ni/Au, and hybrid Ni/Au and Ag-NW contacts, respectively. A very high responsivity of 5.40 A W<sup>–1</sup> and detectivity of 3.4 × 10<sup>11</sup> cm W<sup>–1</sup> Hz<sup>1/2</sup> at bias voltage of 15 V for light with a wavelength of 325 nm is obtained for UV photodetector with Ni/Au interdigitated contacts. The best performance of devices with Ni/Au interdigitated contacts due to the higher Schottky barrier height of ~1.49 eV for Ni/Au contacts in comparison with ~1.26 eV for Cr/Au contacts is found. The measured response times of all UV photodetectors is in the µs-range and is limited by the <i>RC</i> time of the measurement system. Thus, this study demonstrates the high potential of ZnSe-based MSM structures with Ni/Au interdigitated and hybrid Ni/Au and Ag-NW contacts as a high-sensitive ultrafast UV photodetectors, which are promising for the applications, such as UV tomography and UV high-speed communication systems.</p>","PeriodicalId":731,"journal":{"name":"Physics of the Solid State","volume":null,"pages":null},"PeriodicalIF":0.9000,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physics of the Solid State","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1134/S1063783424601164","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"PHYSICS, CONDENSED MATTER","Score":null,"Total":0}
引用次数: 0
Abstract
We report on fabrication and characterization of high-performance ZnSe-based metal–semiconductor–metal (MSM) ultraviolet (UV) photodetectors with different Schottky contacts (Cr/Au, Ni/Au, Ag‑nanowire (Ag-NW)) and device structures (conventional planar contacts, interdigitated contacts, hybrid nanowire contacts). At room temperature, the low values of dark current of 0.71, 0.59, and 0.36 nA at bias voltage of 15 V were achieved for devices with Cr/Au, Ni/Au, and hybrid Ni/Au and Ag-NW contacts, respectively. A very high responsivity of 5.40 A W–1 and detectivity of 3.4 × 1011 cm W–1 Hz1/2 at bias voltage of 15 V for light with a wavelength of 325 nm is obtained for UV photodetector with Ni/Au interdigitated contacts. The best performance of devices with Ni/Au interdigitated contacts due to the higher Schottky barrier height of ~1.49 eV for Ni/Au contacts in comparison with ~1.26 eV for Cr/Au contacts is found. The measured response times of all UV photodetectors is in the µs-range and is limited by the RC time of the measurement system. Thus, this study demonstrates the high potential of ZnSe-based MSM structures with Ni/Au interdigitated and hybrid Ni/Au and Ag-NW contacts as a high-sensitive ultrafast UV photodetectors, which are promising for the applications, such as UV tomography and UV high-speed communication systems.
期刊介绍:
Presents the latest results from Russia’s leading researchers in condensed matter physics at the Russian Academy of Sciences and other prestigious institutions. Covers all areas of solid state physics including solid state optics, solid state acoustics, electronic and vibrational spectra, phase transitions, ferroelectricity, magnetism, and superconductivity. Also presents review papers on the most important problems in solid state physics.