4.7 Article

Ternary compound MgTiO 3 combined with graphene for solar-blind deep ultraviolet photodetection

期刊

JOURNAL OF ALLOYS AND COMPOUNDS
卷 911, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.165031

关键词

MgTiO 3; Graphene; Solar-blind ultraviolet; Photodetectors; Photovoltaic

资金

  1. National Engineering Research Center for Optoelectronic Crystalline Materials [OCM-2020-07]
  2. Natural Science Foundation of Guangdong Province for Distinguished Young Scholars [2021B1515020105]
  3. Science and Technology Innovation Special Fund Project of Fujian Agricultural and Forestry University [CXZX2020101A]
  4. Key Laboratory of Optoelectronic Materials Chemistry and Physics, Chinese Academy of Sciences [2008DP173016]

向作者/读者索取更多资源

Ternary compound MgTiO3 (MTO) is successfully applied in solar-blind UV photodetectors by investigating the effect of annealing on the structure of MTO thin film and combining MTO with graphene. The MTO-based detector exhibits excellent performance with high open circuit voltage, ultrafast response speed, high responsivity, EQE, and specific detectivity.
Ternary materials have gained great popularity in the field of solar-blind ultraviolet (UV) photodetectors due to their diverse band gaps. Whereas, quality problems brought by lattice damage and phase separation appear frequently during preparation, which greatly limit the application of ternary solar-blind photoresponsive materials. MgTiO3 (MTO), a ceramic material, has extensive application in microwave capacitors and dielectric resonators but takes no place in the field of photodetectors. Faced with this situation, this study investigates the effect of annealing on the structure of MTO thin film, and fabricates a solar-blind UV detector through combining MTO with graphene, which expands the application of ternary compound MTO to the field of photodetectors. Under solar-blind UV illumination, this MTO-based detector exhibits excellent performance with an open circuit voltage as high as 1.7 V. At 0 V bias, the detector exhibits an ultrafast response speed with the rise and decay time as short as 30 ms and 25 ms, respectively. Besides, a responsivity up to 46.5 mA/W, an external quantum efficiency (EQE) up to 20.4%, and a specific detectivity (D*) up to 6.14 x 1011 Jones also prove the great performance this detector owns. All the results achieved in this work not only suggest the great potential of MTO in being applied to fabricating solar-blind UV detectors, but also provide some guidance for the development of photovoltaic detectors based on other ternary semiconductor materials.

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