Uncooled Ultraviolet to Mid-infrared Multifunctional Photodetectors Based on Monolayer Graphene on Pb[(Mg_1/3Nb_2/3)_0.7Ti_0.3]O₃Substrate

TY - JOUR

T1 - Uncooled Ultraviolet to Mid-infrared Multifunctional Photodetectors Based on Monolayer Graphene on Pb[(Mg1/3Nb2/3)0.7Ti0.3]O3Substrate

AU - Fan, Yujing

AU - Abid, Mohamed

AU - Zerara, Mohamed

AU - Yang, Longkun

AU - Cao, Ze

AU - Ó Coileáin, Cormac

AU - An, Fengjiang

AU - Wang, Jing Jing

AU - Cheng, Hung Hsiang

AU - Chang, Ching Ray

AU - Wu, Han Chun

N1 - Publisher Copyright: © 2025 American Chemical Society

PY - 2025/9/3

Y1 - 2025/9/3

N2 - Graphene heralded a new era in optoelectronic research and prospective multifunctional devices. Here, we demonstrate uncooled ultraviolet to mid-infrared multifunctional photodetectors based on monolayer graphene on a Pb[(Mg1/3Nb2/3)0.7Ti0.3]O3(PMNPT) substrate, with capabilities in photodetection, memory, and signal processing. Using weak broad-spectral light, photoexcited holes in graphene are attracted by the stable spontaneous polarization within the PMNPT, inducing a gate tunable giant photogating effect. This enables multivalued saving and high-performance broad spectral photodetection (365 nm to 11.6 μm). Responsivities of ∼103A/W in the visible region, ∼102A/W in the near-infrared (NIR) region, and ∼101A/W in the MIR region were achieved, respectively. Moreover, we developed neuromorphic hardware based on a proposed optoelectronic synaptic graphene transistor crossbar array and demonstrated exceptional signal processing accuracy of 93% in biological signal detection and image recognition. This neuromorphic hardware can also serve as a foundational functional unit, achieving high efficiency in data compression and feature extraction. Our approach marks a significant advancement toward graphene-based multifunctional devices.

AB - Graphene heralded a new era in optoelectronic research and prospective multifunctional devices. Here, we demonstrate uncooled ultraviolet to mid-infrared multifunctional photodetectors based on monolayer graphene on a Pb[(Mg1/3Nb2/3)0.7Ti0.3]O3(PMNPT) substrate, with capabilities in photodetection, memory, and signal processing. Using weak broad-spectral light, photoexcited holes in graphene are attracted by the stable spontaneous polarization within the PMNPT, inducing a gate tunable giant photogating effect. This enables multivalued saving and high-performance broad spectral photodetection (365 nm to 11.6 μm). Responsivities of ∼103A/W in the visible region, ∼102A/W in the near-infrared (NIR) region, and ∼101A/W in the MIR region were achieved, respectively. Moreover, we developed neuromorphic hardware based on a proposed optoelectronic synaptic graphene transistor crossbar array and demonstrated exceptional signal processing accuracy of 93% in biological signal detection and image recognition. This neuromorphic hardware can also serve as a foundational functional unit, achieving high efficiency in data compression and feature extraction. Our approach marks a significant advancement toward graphene-based multifunctional devices.

KW - all-in-one device

KW - broadband detection

KW - monolayer graphene

KW - multifunctional devices

KW - photogating effect

UR - https://www.scopus.com/pages/publications/105015365728

U2 - 10.1021/acsami.5c12034

DO - 10.1021/acsami.5c12034

M3 - Article

C2 - 40851225

AN - SCOPUS:105015365728

SN - 1944-8244

VL - 17

SP - 50024

EP - 50034

JO - ACS Applied Materials and Interfaces

JF - ACS Applied Materials and Interfaces

IS - 35

ER -