厦门大学戴李宗团队报道了一种调节MoS₂场效应晶体管界面的分子配位策略。相关研究成果发表在2024年3月28日出版的国际知名学术期刊《美国化学会杂志》。

用有机分子化学修饰单层二维过渡金属二硫族化合物（TMDs），为调节材料和器件的电子和光电性能提供了广泛的可能性。然而，在不破坏其晶体结构的情况下，将有机分子化学连接到单层TMDs上仍然具有挑战性。

该文中，研究人员发现单层MoS₂（1L-MoS₂）的Mo原子在缺陷状态下可以与邻苯二酚和1,10-菲罗啉（Phen）基团配位，为化学修饰1L-MoS₂提供了一条简单的途径。通过设计含有邻苯二酚和Phen基团的两个异构分子（LA2和LA5），发现通过配位键将有机分子连接到Mo原子上，对1L-MoS₂的晶体结构没有负面影响。

理论计算和实验结果表明，该协调策略有利于修复硫空位和钝化缺陷；（ii）实现长期且稳定的n-掺杂效果；以及（iii）促进电子转移。基于协同修饰的1L-MoS₂的场效应晶体管（FET）显示出高达120.3 cm² V^–1 s^–1的高电子迁移率，其电流开/关比超过109。结果表明，配位连接含邻苯二酚或Phen的分子可能是TMDs无损修饰的一种通用方法。

附：英文原文

Title: A Molecular Coordination Strategy for Regulating the Interface of MoS2 Field Effect Transistors

Author: Yu Luo, Huiqiang Lu, Jingwen Huang, Liu He, Hailong Chen, Conghui Yuan, Yiting Xu, Birong Zeng, Lizong Dai

Issue&Volume: March 28, 2024

Abstract: Chemically modifying monolayer two-dimensional transition metal dichalcogenides (TMDs) with organic molecules provides a wide range of possibilities to regulate the electronic and optoelectronic performance of both materials and devices. However, it remains challenging to chemically attach organic molecules to monolayer TMDs without damaging their crystal structures. Herein, we show that the Mo atoms of monolayer MoS2 (1L-MoS2) in defect states can coordinate with both catechol and 1,10-phenanthroline (Phen) groups, affording a facile route to chemically modifying 1L-MoS2. Through the design of two isomeric molecules (LA2 and LA5) comprising catechol and Phen groups, we show that attaching organic molecules to Mo atoms via coordinative bonds has no negative effect on the crystal structure of 1L-MoS2. Both theoretical calculation and experiment results indicate that the coordinative strategy is beneficial for (i) repairing sulfur vacancies and passivating defects; (ii) achieving a long-term and stable n-doping effect; and (iii) facilitating the electron transfer. Field effect transistors (FETs) based on the coordinatively modified 1L-MoS2 show high electron mobilities up to 120.3 cm2 V–1 s–1 with impressive current on/off ratios over 109. Our results indicate that coordinatively attaching catechol- or Phen-bearing molecules may be a general method for the nondestructive modification of TMDs.

DOI: 10.1021/jacs.3c13696

Source: https://pubs.acs.org/doi/abs/10.1021/jacs.3c13696