Wafer-Scale Fabrication of Two-Dimensional PtS2/PtSe2 Heterojunctions for Efficient and Broad band Photodetection

Jian Yuan, Tian Sun, Zhixin Hu, Wenzhi Yu, Weiliang Ma, Kai Zhang, Baoquan Sun, Shu Ping Lau, Qiaoliang Bao, Shenghuang Lin, Shaojuan Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

105 Citations (Scopus)


The fabrication of van der Waals heterostructures mainly extends to two-dimensional (2D) materials that are exfoliated from their bulk counterparts, which is greatly limited by high-volume manufacturing. Here, we demonstrate multilayered PtS2/PtSe2 heterojunctions covering a large area on the SiO2/Si substrate with a maximum size of 2″ in diameter, offering throughputs that can meet the practical application demand. Theoretical simulation was carried out to understand the electronic properties of the PtS2/PtSe2 heterojunctions. Zero-bias photoresponse in the heterojunctions is observed under laser illumination of different wavelengths (405-2200 nm). The PtS2/PtSe2 heterojunctions exhibit broad band photoresponse and high quantum efficiency at infrared wavelengths with lower bounds for the external quantum efficiencies being 1.2% at 1064 nm, 0.2% at 1550 nm, and 0.05% at 2200 nm, and also relatively fast response time at the dozens of millisecond level. The large area, broad band 2D heterojunction photodetector demonstrated in this work further corroborates the great potential of 2D materials in the future low-energy optoelectronics.

Original languageEnglish
Pages (from-to)40614-40622
Number of pages9
JournalACS Applied Materials and Interfaces
Issue number47
Publication statusPublished - 28 Nov 2018


  • broad band photodetection
  • photoresponsivity
  • quantum efficiency
  • self-driving operation
  • van der Waals heterostructures
  • wafer-scale fabrication

ASJC Scopus subject areas

  • General Materials Science


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