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Solution-processed nitrogen-doped graphene quantum dots/perovskite composite heterojunction for boosting performance of anatase titanium dioxide (TiO2)-based UV photodetector

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Abstract

In this work, a facile and low-cost method is introduced to boost performance of TiO2-based UV photodetector (PD). The method involves addition of a solution-processed GQDs-CsPbBr3 composite layer to the TiO2 film to fabricate a high-performance and stable hybrid photodetector based on TiO2/GQDs-CsPbBr3 bilayer heterojunction. The TiO2/GQDs-CsPbBr3 bilayer heterojunction was characterized with several techniques. The ultraviolet–visible (UV–Vis) and photoluminescence (PL) spectrometers reveal that the absorption and emission of the TiO2/GQDs-CsPbBr3 bilayer heterojunction have significantly enhanced compared with that of the anatase TiO2 film, without the GQDs-CsPbBr3 composite layer. In addition, The hybrid photodetector shows a low dark current (ID = 0.13 nA), a high light current (IL = 343,626 nA), an on/off ratio (2.69 × 106), a responsivity (R = 7.11 A/W), and a specific detectivity (D* = 3.32 × 1013 J). The responsivity of the hybrid was improved by 64 times in magnitudes compared with that of the TiO2 without the GQDs-CsPbBr3 composite layer. Moreover, the performance of the hybrid photodetector not only outdo the performance of reported PDs based on wide bandgap materials/perovskite and 2D materials/2D materials bilayer heterostructure, but also performance of PDs based on 2D materials/2D materials/2D materials and silicon/2D materials/2D materials triple-layer heterostructure. The enhanced performance of the hybrid PD was due to the excellent alignment between the anatase TiO2, GQDs, and CsPbBr3, which enabled the TiO2/GQDs-CsPbBr3 bilayer heterojunction to reduce recombination process and increase photon-absorption rate. These results pave the way for enhancing the wide bandgap materials-based UV optoelectronics with the solution-processed and low-cost GQDs-CsPbBr3 composite.

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Funding

The authors are thankful to the Deanship of Scientific Research at Najran University, Najran, Kingdom of Saudi Arabia, for funding under the Research Collaboration funding program grant no. NU/NRP/SERC/11/29.

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Authors and Affiliations

  1. Promising Centre for Sensors and Electronic Devices (PCSED), Najran University, Najran-11001, Kingdom of Saudi Arabia

    Hassan Algadi

  2. Department of Electrical Engineering, Faculty of Engineering, Najran University, Najran-11001, Kingdom of Saudi Arabia

    Hassan Algadi

  3. College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan, 030024, China

    Junna Ren

  4. Vitreous State Laboratory, The Catholic University of America, Washington, DC, 20064, USA

    Asmma Alqarni

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HA contributed to the study conception and design. Material preparation, data collection, and analysis were performed by HA, JR, and AA. JR and AA conducted data analysis and discussion. The manuscript was written by HA and JR. All authors read and approved the final manuscript.

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Algadi, H., Ren, J. & Alqarni, A. Solution-processed nitrogen-doped graphene quantum dots/perovskite composite heterojunction for boosting performance of anatase titanium dioxide (TiO2)-based UV photodetector. Adv Compos Hybrid Mater 6, 86 (2023). https://doi.org/10.1007/s42114-023-00667-8

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