The relation between surface chemistry and (Opto)electrical properties of lead sulfide quantum dots (PbS QDs) is of importance for the development of cost-effective field-effect transistor (FETs) and quantum dot solar cells. Herein, simple chloride surface treatment has been demonstrated by adding tetramethylammonium chloride (TMACl) into a QD washing step. Absorption, photoluminescence (PL) and X-ray photoelectron spectroscopic studies revealed that Cl⁻ ions bound strongly to PbS QDs surfaces resulting in enhanced PL of colloidal QDs. Furthermore, FET studies on PbS QD thin films fabricated by an identical solid-state ligand exchanging with 1,2-ethanedithiol (EDT) showed that TMACl treatment enhanced hole mobility by ten times and at the same time switched the EDT-treated QD thin film from p-type to ambipolar semiconductor with electron mobility of 2.8 × 10⁻² cm²V⁻¹s⁻¹. The results demonstrated herein offer a simple treatment for the fabrication of multiple QD junctions with minor change in processing.

硫化铅量子点（PbS QDs）的表面化学性质与（光电）电学性质之间的关系对于开发具有成本效益的场效应晶体管（FET）和量子点太阳能电池至关重要。本文中，已经通过将四甲基氯化铵（TMAC1）添加到QD洗涤步骤中证明了简单的氯化物表面处理。吸收，光致发光（PL）和X射线光电子能谱研究表明，氯^-离子牢固地结合在PbS QD表面上，从而导致胶体QD的PL增强。此外，FET对由相同的固态配体与1,2-乙二硫醇（EDT）交换而制得的PbS QD薄膜的研究表明，TMACl处理将空穴迁移率提高了十倍，同时切换了经EDT处理的QD薄膜从p型到双极性半导体，电子迁移率为2.8×10 ^-2  cm ² V ^-1 s ^-1。本文展示的结果为制造多个QD结提供了一种简单的处理方法，但工艺上仅有很小的变化。