DataVXAdvanced Optical MaterialsPaper
journal article·2019-06

Engineering Vacancies in Bi2S3 yielding Sub‐Bandgap Photoresponse and Highly Sensitive Short‐Wave Infrared Photodetectors

Nengjie Huo, Alberto Figueroba, Yujue Yang, Sotirios Christodoulou, Alexandros Stavrinadis, César Magén, Gerasimos Konstantatos

Advanced Optical Materials· Volume 7· Issue 11
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Source abstract

Abstract

Abstract Defects play an important role in tailoring the optoelectronic properties of materials. Supported by density functional theory (DFT) calculations, herein it is demonstrated that sulphur vacancies are able to engineer sub‐band gap photoresponse in the short‐wave infrared range due to formation of in‐gap states in Bi2S3 single crystals. Sulfurization and subsequent refill of the vacancies result in faster response but limit the spectral range to the near infrared as determined by the bandgap of Bi2S3. A facile chemical treatment is then explored to accelerate the speed of sulphur deficient (SD)‐based detectors on the order of 10 ms without sacrificing its spectral coverage of the infrared, while holding a high specific detectivity (D*) close to 1015 Jones in the visible–near infrared range and 1012 Jones at 1.6 µm. This work also provides new insights into the role sulphur vacancies play in the electronic structure and, as a result, in sub‐bandgap photoresponse enabling ultrasensitive, fast, and broadband photodetectors.
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Research context

Electronic materials

OpenAlex topics: Chalcogenide Semiconductor Thin Films · 2D Materials and Applications · Advanced Thermoelectric Materials and Devices

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

ICFO–Institut de Ciencies Fotoniques The Barcelona Institute of Science and Technology Castelldefels 08860 Barcelona Spain

School of Physics and Optoelectronic Engineering Guangdong University of Technology Guangzhou 510006 China

Instituto de Ciencia de Materiales de Aragón (ICMA) Universidad de Zaragoza‐CSIC 50009 Zaragoza Spain

Laboratorio de Microscopías Avanzadas Instituto de Nanociencia de Aragón Universidad de Zaragoza 50018 Zaragoza Spain

Departamento de Física de la Materia Condensada Universidad de Zaragoza 50009 Zaragoza Spain

ICREA–Institució Catalana de Recerca i Estudis Avançats Lluis Companys 23 08010 Barcelona Spain

Funding

European Research Council · Ministerio de Economía y Competitividad · Federación Española de Enfermedades Raras · National Natural Science Foundation of China

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