2026-10-14T11:40:54Z https://api.figshare.com/v2/oai

oai:figshare.com:article/33941177 2026-09-19T03:04:49Z category_1 category_4 category_915 category_7 category_734 portal_63 item_type_2 month_year_09_2026

Visualizing Heteroepitaxy of Angle-Oriented GeSe/WSe₂ Heterostructures for Near-Infrared Ultrasensitive Photodetectors Mengmeng Yang (475288) Shijuan Ran (25074458) Shangyu Dai (25074461) Jianjun Qiu (11546888) Xueting Liu (473855) Qunrui Deng (19430557) Haiyuan Chen (6019931) Zhixin Luo (4507792) Huawen Quan (25074464) Nengjie Huo (1650637) Jun Liu (42548) Wenlong Chen (1774702) Zhaoqiang Zheng (1465447) Zuxin Chen (2891333) Wei Gao (2085) Biophysics Biochemistry Physical Sciences not elsewhere classified Medicine Biological Sciences not elsewhere classified van der waals time observation captures optimized light harvesting ii band alignment directed heteroepitaxy strategy accelerating process optimization preferential epitaxial angle maximum coverage ). 2 </ sub based vdw heterostructures visualizing heteroepitaxy performance optimization work establishes tunable photodetectors situ imaging pixel imaging orientation evolution nucleation kinetics magnitude enhancement heterostructures remains contrast single back type also demonstrated 808 nm 37 %) 20 ° Precise heteroepitaxial control in van der Waals (vdW) heterostructures remains a challenge. Here, we demonstrate a visualized and directed heteroepitaxy strategy for GeSe on WSe₂ by integrating in situ imaging with symmetry-guided physical vapor deposition. Real-time observation captures the nucleation kinetics and orientation evolution, accelerating process optimization. Combined density functional theory calculations and transmission electron microscope characterizations identify a preferential epitaxial angle of 20° (occurrence: 59.37%) for most GeSe nanosheets, corresponding to the global energy minimum governed by lattice symmetry. Coverage-tunable photodetectors are constructed by modulating GeSe nanosheets’ number, delivering a three-orders-of-magnitude enhancement in responsivity at 808 nm (823.8 A/W at maximum coverage). This is attributed to optimized light harvesting in GeSe and a photogating effect via back-to-back type-II band alignment. High-contrast single-pixel imaging is also demonstrated. This work establishes a paradigm for visualized synthesis and performance optimization of monochalcogenide-based vdW heterostructures. 2026-09-18T00:00:00Z Dataset Media 10.1021/acs.nanolett.6c03380.s001 https://figshare.com/articles/media/Visualizing_Heteroepitaxy_of_Angle-Oriented_GeSe_WSe_sub_2_sub_Heterostructures_for_Near-Infrared_Ultrasensitive_Photodetectors/33941177 CC BY-NC 4.0