title: Precise, Self-Limited Epitaxy of Ultrathin Organic Semiconductors and Heterojunctions Tailored by van der Waals Interactions.
abstract: Precise assembly of semiconductor heterojunctions is the key to realize many optoelectronic devices. By exploiting the strong and tunable van der Waals (vdW) forces between graphene and organic small molecules, we demonstrate layer-by-layer epitaxy of ultrathin organic semiconductors and heterostructures with unprecedented precision with well-defined number of layers and self-limited characteristics. We further demonstrate organic p-n heterojunctions with molecularly flat interface, which exhibit excellent rectifying behavior and photovoltaic responses. The self-limited organic molecular beam epitaxy (SLOMBE) is generically applicable for many layered small-molecule semiconductors and may lead to advanced organic optoelectronic devices beyond bulk heterojunctions.
authors.affiliation: National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China.
authors.forename: Bing
authors.initials: B
authors.lastname: Wu
authors.affiliation: Department of Physics, Southeast University , Nanjing 211189, People's Republic of China.
authors.forename: Yinghe
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: Department of Physics, Southeast University , Nanjing 211189, People's Republic of China.
authors.forename: Haiyan
authors.initials: H
authors.lastname: Nan
authors.affiliation: National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China.
authors.forename: Ziyi
authors.initials: Z
authors.lastname: Yang
authors.affiliation: National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China.
authors.forename: Yuhan
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China.
authors.forename: Huijuan
authors.initials: H
authors.lastname: Zhao
authors.affiliation: National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China.
authors.forename: Daowei
authors.initials: D
authors.lastname: He
authors.affiliation: National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China.
authors.forename: Zonglin
authors.initials: Z
authors.lastname: Jiang
authors.affiliation: National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China.
authors.forename: Xiaolong
authors.initials: X
authors.lastname: Liu
authors.affiliation: National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China.
authors.forename: Yun
authors.initials: Y
authors.lastname: Li
authors.affiliation: National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Shi
authors.affiliation: Department of Physics, Southeast University , Nanjing 211189, People's Republic of China.
authors.forename: Zhenhua
authors.initials: Z
authors.lastname: Ni
authors.affiliation: Department of Physics, Southeast University , Nanjing 211189, People's Republic of China.|Synergetic Innovation Center for Quantum Effects and Applications (SICQEA), Hunan Normal University , Changsha 410081, China.
authors.forename: Jinlan
authors.initials: J
authors.lastname: Wang
authors.affiliation: Department of Electronic Engineering and Materials Science and Technology Research Center, The Chinese University of Hong Kong , Hong Kong SAR, People's Republic of China.
authors.forename: Jian-Bin
authors.initials: JB
authors.lastname: Xu
authors.affiliation: National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China.
authors.forename: Xinran
authors.initials: X
authors.lastname: Wang
keywords: Two-dimensional; heterojunctions; organic crystals; van der Waals epitaxy