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Precise, Self-Limited Epitaxy of Ultrathin Organic Semiconductors and Heterojunctions Tailored by van der Waals Interactions
journal contribution
posted on 2016-05-16, 00:00 authored by Bing Wu, Yinghe Zhao, Haiyan Nan, Ziyi Yang, Yuhan Zhang, Huijuan Zhao, Daowei He, Zonglin Jiang, Xiaolong Liu, Yun Li, Yi Shi, Zhenhua Ni, Jinlan Wang, Jian-Bin Xu, Xinran WangPrecise 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.