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Defect-associated adsorption of monoethanolamine on TiO2(1 1 0): An alternative way to control the work function of oxide electrode
摘要： Controlling defects is one of the basic strategies for tailoring electronic structure of materials, which has not been explored that much yet for organic-inorganic hybrid systems. In this study, we investigated the control of work function of oxide electrode by defect-associated adsorption of molecules at the single-molecule level by means of scanning tunneling microscopy and first principle calculations. The equilibrium adsorption configuration of monoethanolamine (MEA, HO(CH2)2NH2), an effective coating for lowering the work function of an oxide electrode, varies as a function of surface coverage at TiO2(1 1 0) surfaces. Our results showed that defects at the oxide surface and intermolecular interactions dominate the stable configuration of adsorbates as well as work function of the system. The dissociative adsorption at Ov was found to be more efficient at lowering the work function of TiO2(1 1 0) surface, suggesting that defect control can be used to improve the performance of organic-inorganic hybrid systems.
关键词： STM,Work function,DFT,TiO2(1 1 0),Defect,Monoethanolamine
更新于2025-09-23 15:21:21
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Existence of Ligands within Sol-gel-derived ZnO Films and Their Effect on Perovskite Solar Cells
摘要： The sol-gel (SG) method has been well-documented as one useful way to produce ZnO films as an excellent electron transport material (ETM) for efficient perovskite solar cells (PSCs). Generally, the precursor films containing zinc acetate dihydrate and a stabilizing ligand monoethanolamine (EA) were annealed to obtain ZnO films. A noteworthy issue is the commonly reported annealing temperature (Ta) in a wide range of 150-600 °C. In this work, we investigated the effect of the annealing temperature on the film composition and firstly confirmed the co-existence of acetate and EA species when Ta is below 380 °C. EA still survived within the ZnO films when Ta was between 380 and 450 °C. When Ta was over 450 °C, pure ZnO films can be obtained. The presence of ligands also remarkably altered the work function of the corresponding ZnO samples, thereby resulting in the remarkably different effects on the efficiency and stability of PSCs with the ZnO samples as ETMs. This work affords a clearer understanding of ZnO films prepared by SG method at molecular insights, promoting their application in photoelectric fields.
关键词： Coordinated molecules,Monoethanolamine,Sol-gel-derived ZnO,Zinc acetate dihydrate,Perovskite solar cells
更新于2025-09-11 14:15:04