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Doping Indium Oxide Films with Amino-Polymers of Varying Nitrogen Content Markedly Affects Charge Transport and Mechanical Flexibility
作者:Zhi Wang
关键字:Amino-Polymers
论文来源:期刊
发表时间:2021年
Here, correlations between polymer structure and charge transport in solution-processed indium oxide, In2O3:polymer blend flexible thin film transistors (TFTs) are investigated using four polymers having electron-donating amine functionalities (polyethyleneimine (PEI), poly(allylamine), polyethyleneimine ethoxylated (PEIE), and PVP-NH2 (PVP; poly(4-vinylphenol)), and two PEIPEIE mixtures) with varied atomic amine nitrogen content (N%) of 12.6, 9.1, 6.9, 2.6, respectively. These amino-polymers influence the semiconducting oxide film TFT electron mobilities via a delicate interplay of electron transfer/ doping, charge generation/trap-filling, film morphological/microstructural variations, which depend on the polymer structure, thermal stability, and N%, as well as the polymer content of the In2O3 precursor and the carbon residue content in In2O3. Thus, increasing the N% from 0.0% in the control PVP to 12.6% in PEI increases the electron doping capacity, the polymer content of the blend formulation, and the blend TFT field-effect mobility. Optimal polymer incorporation invariably enhances charge transport by as much as ≈2×, leading to a maximum carrier mobility of 8.47 ± 0.73 cm2 V?1 s?1 on rigid Si/SiOx substrates and a remarkable 31.24 ± 0.41 cm2 V?1 s?1 on mechanically flexible polyimide/Au/F:AlOx substrates with Al contacts. Furthermore, all of the polymers equally enhance the mechanical durability of the corresponding In2O3:polymer blend TFTs with respect to mechanical stress.