Parmar, Devang ; Dehm, Simone ; Peyyety, Naga Anirudh ; Kumar, Sandeep ; Krupke, Ralph (2024)
Enhanced Broadband Photodetection with Geometry and Interface Engineered Nanocrystalline Graphite.
In: Advanced Sensor Research, 2024, 3 (2)
doi: 10.26083/tuprints-00027103
Artikel, Zweitveröffentlichung, Verlagsversion
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Kurzbeschreibung (Abstract)
Photodetection across the near‐infrared (NIR) to short‐wavelength infrared (SWIR) spectrum is important for many applications. This study explores photodetection using nanocrystalline graphite (NCG) in a suspended, narrow constriction configuration for improved performance. Bowtie constrictions are fabricated in both suspended and substrate‐supported NCG devices, allowing for accurate comparison. It shows that the suspended constriction enhances the bolometric photoresponse and sensor detectivity by several orders of magnitude compared to the substrate‐supported counterparts, attributed to reduced thermalization and electric field concentration. The suspended configuration preserves a spectrally flat photoresponse while reducing operating voltage through a tailored NCG layer thickness. Chromatic aberration‐corrected photocurrent spectroscopy is used to measure the photoresponse from 1100 to 1700 nm, and diffraction‐limited hyperspectral photocurrent imaging is conducted to measure the local photocurrent generation across the device. Bolometric and photo‐thermoelectric currents are restricted to the suspended central constriction due to electric field concentration and thermal decoupling and the direction of the photocurrents within the sensor is revealed. The experimental data is complemented by simulations of the light absorption and the electric field distribution. This work indicates the importance of geometry and thermal decoupling for boosting device performance, offering promising prospects for sensitive and low‐power NCG‐based photodetectors in the NIR‐SWIR range.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Parmar, Devang ; Dehm, Simone ; Peyyety, Naga Anirudh ; Kumar, Sandeep ; Krupke, Ralph |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Enhanced Broadband Photodetection with Geometry and Interface Engineered Nanocrystalline Graphite |
| Sprache: | Englisch |
| Publikationsjahr: | 18 Juni 2024 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | Februar 2024 |
| Ort der Erstveröffentlichung: | Weinheim |
| Verlag: | Wiley-VCH |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Advanced Sensor Research |
| Jahrgang/Volume einer Zeitschrift: | 3 |
| (Heft-)Nummer: | 2 |
| Kollation: | 10 Seiten |
| DOI: | 10.26083/tuprints-00027103 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/27103 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichung DeepGreen |
| Kurzbeschreibung (Abstract): | Photodetection across the near‐infrared (NIR) to short‐wavelength infrared (SWIR) spectrum is important for many applications. This study explores photodetection using nanocrystalline graphite (NCG) in a suspended, narrow constriction configuration for improved performance. Bowtie constrictions are fabricated in both suspended and substrate‐supported NCG devices, allowing for accurate comparison. It shows that the suspended constriction enhances the bolometric photoresponse and sensor detectivity by several orders of magnitude compared to the substrate‐supported counterparts, attributed to reduced thermalization and electric field concentration. The suspended configuration preserves a spectrally flat photoresponse while reducing operating voltage through a tailored NCG layer thickness. Chromatic aberration‐corrected photocurrent spectroscopy is used to measure the photoresponse from 1100 to 1700 nm, and diffraction‐limited hyperspectral photocurrent imaging is conducted to measure the local photocurrent generation across the device. Bolometric and photo‐thermoelectric currents are restricted to the suspended central constriction due to electric field concentration and thermal decoupling and the direction of the photocurrents within the sensor is revealed. The experimental data is complemented by simulations of the light absorption and the electric field distribution. This work indicates the importance of geometry and thermal decoupling for boosting device performance, offering promising prospects for sensitive and low‐power NCG‐based photodetectors in the NIR‐SWIR range. |
| Freie Schlagworte: | bolometric photodetection, nanocrystalline graphene, NIR, photocurrent spectroscopy, SWIR |
| ID-Nummer: | Artikel-ID: 2300134 |
| Status: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-271034 |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften und Maschinenbau |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Molekulare Nanostrukturen |
| Hinterlegungsdatum: | 18 Jun 2024 12:59 |
| Letzte Änderung: | 19 Jun 2024 09:03 |
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| Suche nach Titel in: | TUfind oder in Google |
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- Enhanced Broadband Photodetection with Geometry and Interface Engineered Nanocrystalline Graphite. (deposited 18 Jun 2024 12:59) [Gegenwärtig angezeigt]
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