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journal article·2026-05Open access

Flattening Energy Puddles for Enhanced Charge Transport in Wrinkled WSe 2

Dae Young Park, Taehoon Kim, Bora Kim, Nohyoon Park, Seungho Bang, Dohyeon Lee, Deogkyu Choi, Dong Hyeon Kim, Jaekak Yoo, Seung Mi Lee, Young Joo Yu, Jieun Jo, Jungeun Song, Hayoung Ko, Yo Seob Won, Takmo Jeong, Seok Joon Yun, Ki Kang Kim, Dong‐Wook Kim, Jooyoung Sung, Mun Seok Jeong

Small· Volume 22· Issue 28
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Source abstract

Abstract

ABSTRACT Wrinkles, a prevalent form of line defect in monolayer (1L) 2D materials, significantly degrade their optoelectronic performance by inducing local strain, energy puddles, and charge trapping. This study introduces a wrinkle‐selective strategy utilizing trioctylphosphine selenide (TOPSe), which exploits its steric hindrance and electron‐donating nature to selectively heal selenium vacancies at strained wrinkle sites in 1L‐WSe 2 . Comprehensive spectroscopic characterization—comprising Raman spectroscopy, photoluminescence spectroscopy, and femtosecond transient absorption microscopy—demonstrated substantial reductions in the defect density, suppressed non‐radiative recombination, and prolonged exciton lifetimes. Kelvin probe force microscopy further revealed wrinkle‐specific electron doping and spatial homogenization of the conduction band. Field‐effect transistors based on TOPSe‐treated 1L‐WSe 2 exhibited more than a two‐fold increase in current and mobility, in conjunction with a transition from p‐type to n‐type conduction. Our findings indicate that wrinkle‐targeted molecular engineering is a versatile approach for addressing intrinsic inhomogeneities in 2D materials and enabling high‐performance optoelectronic devices.
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Research context

NanomaterialsElectronic materials

OpenAlex topics: 2D Materials and Applications · Graphene research and applications · Topological Materials and Phenomena

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

Affiliations

Department of Physics Hanyang University Seoul Republic of Korea

Department of Science Education Jeonju University Jeonju Republic of Korea

Department of Physics and Chemistry Daegu‐Gyeongbuk Institute of Science and Technology Daegu Republic of Korea

Center for Basic Science Daegu‐Gyeongbuk Institute of Science and Technology Daegu Republic of Korea

Department of Mechatronics Engineering Konkuk University Glocal Campus Chungju Republic of Korea

Department of Chemistry University of Illinois at Urbana‐Champaign Urbana USA

Korea Research Institute of Standards and Science Daejeon Republic of Korea

Department of Physics Ewha Womans University Seoul Republic of Korea

Department of Energy Science Sungkyunkwan University Suwon Republic of Korea

Department of Semiconductor Physics and Engineering University of Ulsan Ulsan Republic of Korea

Department of Physics Sungkyunkwan University Suwon Republic of Korea

Funding

National Research Foundation of Korea · Ministry of Science and ICT, South Korea · Ministry of Education

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