The thiol-based functionalization of multilayer MoS₂ is performed to customize its electrical and optical performance. Two types of thiol-terminated organic molecules are utilized: 4-amino thiophenol (4ATP) for electron-donating and 4-nitro thiophenol (4NTP) for electron-withdrawing. The thiol groups in these molecules chemically bond with MoS₂ at the sulfur vacancies through the simple solution process. 4ATP-functionalized MoS₂ (4ATP–MoS₂) transistors exhibit a huge enhancement in the current and the carrier concentration, whereas 4NTP-functionalized MoS₂ (4NTP–MoS₂) transistors show the reduction in the film conductance. Moreover, functionalization with 4ATP and 4NTP complementarily modulate the photoresponsive characteristics of MoS₂ transistors. Under 405 nm laser illumination, 4ATP–MoS₂ phototransistors exhibit the enhanced photoresponsivity of 669.10 A W⁻¹ attributed to the large dark currents. In contrast, 4NTP–MoS₂ phototransistors can achieve faster photoswitching performances than 4ATP–MoS₂. Therefore, the thiol-based functionalization can effectively customize the electrical and optical characteristics of multilayer MoS₂.

中文翻译：

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通过基于硫醇的功能化定制 MoS2 光电晶体管

执行多层 MoS ₂的基于硫醇的功能化以定制其电学和光学性能。使用两种类型的硫醇封端的有机分子：4-氨基苯硫酚 (4ATP) 用于给电子和 4-硝基苯硫酚 (4NTP) 用于吸电子。这些分子中的硫醇基团通过简单的溶液过程与硫空位处的MoS ₂化学键合。4ATP 功能化的 MoS ₂ (4ATP-MoS ₂ ) 晶体管在电流和载流子浓度方面表现出巨大的增强，而 4NTP 功能化的 MoS ₂ (4NTP-MoS ₂) 晶体管显示出薄膜电导的降低。此外，4ATP 和4NTP 的功能化互补地调节MoS ₂晶体管的光响应特性。在 405 nm 激光照射下，4ATP-MoS ₂光电晶体管表现出 669.10 AW ^-1的增强光响应性，这归因于大暗电流。相比之下，4NTP-MoS ₂光电晶体管可以实现比4ATP-MoS ₂更快的光开关性能。因此，基于硫醇的功能化可以有效地定制多层MoS ₂的电学和光学特性。