Precise, Self-Limited Epitaxy of Ultrathin Organic Semiconductors and Heterojunctions Tailored by van der Waals Interactions

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• 作者：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 Wang
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：June 8, 2016
• 年：2016
• 卷：16
• 期：6
• 页码：3754-3759
• 全文大小：423K
• 年卷期：0
• ISSN：1530-6992

文摘

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.