Ultrasensitive MoS2 photodetector by serial nano-bridge multi-heterojunction

Ki Seok Kim, You Jin Ji, Ki Hyun Kim, Seunghyuk Choi, Dong Ho Kang, Keun Heo, Seongjae Cho, Soonmin Yim, Sungjoo Lee, Jin Hong Park, Yeon Sik Jung, Geun Young Yeom

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The recent reports of various photodetectors based on molybdenum disulfide (MoS2) field effect transistors showed that it was difficult to obtain optoelectronic performances in the broad detection range [visible–infrared (IR)] applicable to various fields. Here, by forming a mono-/multi-layer nano-bridge multi-heterojunction structure (more than > 300 junctions with 25 nm intervals) through the selective layer control of multi-layer MoS2, a photodetector with ultrasensitive optoelectronic performances in a broad spectral range (photoresponsivity of 2.67 × 106 A/W at λ = 520 nm and 1.65 × 104 A/W at λ = 1064 nm) superior to the previously reported MoS2-based photodetectors could be successfully fabricated. The nano-bridge multi-heterojunction is believed to be an important device technology that can be applied to broadband light sensing, highly sensitive fluorescence imaging, ultrasensitive biomedical diagnostics, and ultrafast optoelectronic integrated circuits through the formation of a nanoscale serial multi-heterojunction, just by adding a selective layer control process.

Original languageEnglish
Article number4701
JournalNature Communications
Issue number1
StatePublished - 1 Dec 2019

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