Flattening Energy Puddles for Enhanced Charge Transport in Wrinkled WSe 2
Year: 2026
Type: article
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.
Source: Small
Authors: Dae Young Park, Taehoon Kim, Bora Kim, Nohyoon Park, Seungho Bang, Dohyeon Lee, Deogkyu Choi, Dong Hyeon Kim, 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, Dong‐Wook Kim, Jooyoung Sung, Mun Seok Jeong
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $5,790
OpenAlex ID: W7135017228