journal article·2021-12-01Open access

Growth of MoS2–Nb-doped MoS2 lateral homojunctions: A monolayer p–n diode by substitutional doping

Mitsuhiro Okada, Naoka Nagamura, Tarojiro Matsumura, Yasunobu Ando, Anh Khoa Augustin Lu, Naoya Okada, Wen-Hsin Chang, Takeshi Nakanishi, Tetsuo Shimizu, Toshitaka Kubo, Toshifumi Irisawa, Takatoshi Yamada

APL Materials· Volume 9· Issue 12

Abstract

Monolayer transition metal dichalcogenides (TMDs) have been considered as promising materials for various next-generation semiconductor devices. However, carrier doping techniques for TMDs, which are important for device fabrication, have not been completely established yet. Here, we report a monolayer p–n junction formed using in situ substitutional doping during chemical vapor deposition (CVD). We synthesized monolayer MoS2–Nb-doped MoS2 lateral homojunctions using CVD and then characterized their physical and electrical properties. The optimized growth condition enabled us to obtain spatially selective and heavy Nb doping in the edge region of a single-crystalline MoS2, thus resulting in an obvious work function difference between the inner and edge regions of the crystal. The obtained monolayer crystal demonstrated n-type and degenerate p-type semiconducting behaviors in each region, and a clear rectifying behavior across the n-type and p-type interface was observed. We believe that the results obtained can expand the research field of exploring two-dimensional homo p–n junctions, which can be important for realizing various TMD-based devices, such as diodes and field-effect transistors, with low-contact resistance.
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Research context

OpenAlex topics: 2D Materials and Applications · Graphene research and applications · MXene and MAX Phase Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST) 1 , 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan

Research Center for Advanced Measurement and Characterization (RCAMC), National Institute for Materials Science (NIMS) 2 , 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan

PRESTO, Japan Science and Technology Agency 3 , 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan

Tokyo University of Science 4 , 6-3-1 Niijuku, Katsushika, Tokyo 125-8585, Japan

Research Center for Computational Design of Advanced Functional Materials, National Institute of Advanced Industrial Science and Technology (AIST) 5 , 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan

Mathematics for Advanced Materials Open Innovation Laboratory, National Institute of Advanced Industrial Science and Technology (AIST) 6 , 2-1-1 Katahira, Aoba, Sendai, Miyagi 980-8577, Japan

International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS) 7 , 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan

Device Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST) 8 , 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan

Funding

Japan Society for the Promotion of Science · Core Research for Evolutional Science and Technology · Precursory Research for Embryonic Science and Technology

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