DataVXACS NanoPaper
journal article·2025-02-18

On-Chip Full-UV-Band Photodetectors Enabled by Hot Hole Extraction

Sougata Karmakar, Soham Ash, Sinorul Haque, N. K. Murugasenapathi, M. Sridevi, Indrajeet Mandal, Gurupada Ghorai, A. V. Muhammed Ali, Nitya Nand Gosvami, N. M. Anoop Krishnan, Sayan Kanungo, Manohar Chirumamilla, Tamilarasan Palanisamy, Rajiv K. Singh, Amarnath R. Allu, K. D. M. Rao

ACS Nano· Volume 19· Issue 6
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Source abstract

Abstract

Achieving on-chip, full-UV-band photodetection across UV–A (315–400 nm), UV–B (280–315 nm), and UV–C (100–280 nm) bands remains challenging due to the limitations in traditional materials, which often have narrow detection ranges and require high operating voltages. In this study, we introduce a self-driven, on-chip photodetector based on a heterostructure of hybrid gold nanoislands (Au NIs) embedded in H-glass and cesium bismuth iodide (Cs 3 Bi 2 I 9 ). The Au NIs act as catalytic nucleation sites, enhancing crystallinity and facilitating the vertical alignment of the interconnected Cs 3 Bi 2 I 9 petal-like thin film. A built-in electric field developed at the heterojunction efficiently separates hot holes generated in the Au NIs under UV illumination, transferring them to the valence band of Cs 3 Bi 2 I 9 and minimizing recombination losses. The device demonstrates an ultrahigh open-circuit voltage of 0.6 V, exceptional responsivity of 0.88 A/W, and a detection threshold of 90 nW/cm 2, outperforming the existing thin film-based UV photodetectors under self-driven mode. Long-term stability tests confirmed robust operational reliability under ambient conditions for up to eight months. This architecture, driven by efficient hot hole dynamics, represents a significant advancement for full-UV-band optoelectronics with promising applications in environmental monitoring, flame detection, biomedical diagnostics, and secure communication systems.
Source: openalex_inverted_index · Quality: baseline

Research context

Ceramics & glassesNanomaterialsElectronic materialsCatalysis & surfaces

OpenAlex topics: Perovskite Materials and Applications · Advanced Photocatalysis Techniques · Gas Sensing Nanomaterials and Sensors

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

Affiliations

School of Applied and Interdisciplinary Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, 700032, India

CSIR-Central Glass and Ceramic Research Institute 196 Raja S C Mullick Road, Kolkata 700032, India

Electrodics and Electrocatalysis Division (EEC)

CSIR-Central Electrochemical Research Institute(CECRI)

Academy of Scientific and Innovative Research (AcSIR)

Photovoltaic Metrology Section, Advanced Materials & Device Metrology Division

CSIR-National Physical Laboratory

School of Interdisciplinary Research

Indian Institute of Technology Delhi

Department of Materials Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India

Department of Civil Engineering, Yardi School of Artificial Intelligence

Department of Electrical & Electronics Engineering, Birla Institute of Technology & Science, Pilani, Hyderabad Campus, Jawahar Nagar Kapra Mandal, Hyderabad, Telangana 500078, India

Department of Materials and Production, Aalborg University Skjernvej 4A, Aalborg 9220, Denmark

Institute of Optical and Electronic Materials, Hamburg University of Technology, Eissendorfer Strasse 38, Hamburg 21073, Germany

Funding

Science and Engineering Research Board · UGC-DAE?Consortium for Scientific Research, University Grants Commission

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