The recent development of high-performance colloidal quantum dot (QD) thin-film transistors (TFTs) has been achieved with removal of surface ligand, defect passivation, and facile electronic doping. Here, we report on high-performance solution-processed CdSe QD-TFTs with an optimized surface functionalization and robust defect passivation via hydrazine-free metal chalcogenide (MCC) ligands. The underlying mechanism of the ligand effects on CdSe QDs has been studied with hydrazine-free ex situ reaction derived MCC ligands, such as SnS, SnSe, and InSe, to allow benign solution-process available. Furthermore, the defect passivation and remote n-type doping effects have been investigated by incorporating indium nanoparticles over the QD layer. Strong electronic coupling and solid defect passivation of QDs could be achieved by introducing electronically active MCC capping and thermal diffusion of the indium nanoparticles, respectively. It is also noteworthy that the diffused indium nanoparticles facilitate charge injection not only inter-QDs but also between source/drain electrodes and the QD semiconductors, significantly reducing contact resistance. With benign organic solvents, the SnS, SnSe, and InSe ligand based QD-TFTs exhibited field-effect mobilities exceeding 4.8, 12.0, and 44.2 cm/(V s), respectively. The results reported here imply that the incorporation of MCC ligands and appropriate dopants provide a general route to high-performance, extremely stable solution-processed QD-based electronic devices with marginal toxicity, offering compatibility with standard complementary metal oxide semiconductor processing and large-scale on-chip device applications.
We investigate the role of lanthanides and the surface area of perovskite oxides to determine the electrocatalytic properties in processes such as the oxygen reduction and evolution reactions. To evaluate the effects of A‐site lanthanide and the surface area, a series of lanthanide‐based perovskite nanoparticles (LnSCs) were successfully synthesized with simple co‐precipitation methods, and electrochemical tests were carried out with the LnSCs. According to the results, the catalytic activities are not affected by the A‐site lanthanides, but the surface area was found to be related to the current densities of the perovskite catalysts.
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