Work

Graphene-enabled interface engineering for bias-tunable UV-visible photodetection in an InGaN/Cs 3 Cu 2 I 5 heterojunction

Year: 2026

Type: article

Abstract: The InGaN/Cs 3 Cu 2 I 5 heterojunction shows great potential for UV-visible photodetection due to the superior optoelectronic properties of both materials. However, its performance is limited by poor crystallinity of Cs 3 Cu 2 I 5 and inefficient interfacial carrier transport. To address these issues, we introduce a graphene (Gr) interlayer and construct an InGaN/Gr/Cs 3 Cu 2 I 5 heterojunction photodetector via thermal evaporation. The device exhibits a dark current of 2.2 × 10 −8 A and a maximum responsivity of 0.57 A/W at -2 V under 405 nm illumination and with rise/fall times of 240.2/256.5 μs, respectively. Bias-tunable UV-visible photoresponse and successful detection of 405 nm OOK-modulated signals are further demonstrated. These findings establish Gr interface engineering as an effective strategy for simultaneously improving halide-film growth and heterointerfacial carrier transport.

Source: Optics Express

DOI: 10.1364/oe.616097

Authors: Jixing Chai, Yangpu Liu, Wenliang Wang, Guoqiang Li

Institutions: Dongguan University of Technology, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology

Language: English

Topic: 2D Materials and Applications

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

OpenAlex ID: W7220958690

FWCI:

Cites: 55

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Related to: 10