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Heterojunction interface-induced enhancement of position-sensitive photodetection in the nano-film of Ti/SrTiO3 based on the p-type silicon

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Abstract

Complex oxide perovskites exhibit a range of novel, to the best of our knowledge, physical phenomena and have gained popularity as a material system in the past decades. Strontium titanate (${{\rm SrTiO}_3}$) is an iconic material among oxide perovskite due to its unusual electronic transport behavior and has been investigated in many electronic devices. In this Letter, a type of ${{\rm SrTiO}_3}$ nano-film-induced enhancement of lateral photovoltaic effect (LPE) is observed in the heterojunction of Ti/${{\rm SrTiO}_3}$/p-type Si. Optimizing the thickness of ${{\rm SrTiO}_3}$, the LPE sensitivity can reach 123.2 mV/mm, which is much higher than the sensitivity in the control samples of Ti/Si (55.3 mV/mm) and ${{\rm SrTiO}_3}/{\rm Si}$ (${\sim}{0}\;{\rm mV/mm}$). These findings offer an effective way to improve the sensitivity and will be helpful in the development of oxide-based photodetection devices.

© 2021 Optical Society of America

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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