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SnO2 porous nanosolid (PNS) was prepared by a solvothermal hot-press method,and a new strategy was developed to improve its interfacial crystallinity andcarrier mobility. It was found that the carrier mobility of SnO2 PNS wasimproved after being calcined at 500 {\deg}C in high-pressure oxygen.Furthermore, the mobility was greatly increased by calcining SnO2 PNS at 350{\deg}C for 12 h in high-pressure oxygen, and the highest mobility reached 35cm2/Vs. On the other hand, the complex impedance spectra of the samplesrevealed that the annihilation of oxygen vacancies mainly happens within theinterfacial region among SnO2 nanoparticles during the calcinations process inhigh-pressure oxygen. As a result, the interfacial crystallinity was improvedand carrier mobility was increased. Based on the analysis of experimental data,a simple model was proposed to explain the above phenomena. And the simplemodel may find applications in improving the carrier mobility of other oxidesemiconductors used in photovoltaic cells.

A Strategy for Improving the Interfacial Crystallinity and Carrier Mobility of SnO2 Porous Nanosolids