International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 11 Issue: 05 | May 2024
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p-ISSN: 2395-0072
Review of Photoconductivity Properties in SrTiO3 Substrate Based Oxide Hetrostructures Amit Kumar1, Pramod Kumar2 12 Department of Physics, St. John’s College, Agra, Dr. Bhimrao Ambedkar University, Agra-282002 (UP) India
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Abstract - In the present scenario of materials science and
intricate structures come to life by layering thin films or epitaxial layers of different oxide materials, each with its distinct crystal structure and electronic behavior [2]. It's at the boundaries between these materials that magic unfold, revealing emergent phenomena not witnessed within the individual components [3].
solid-state physics, the study of photoconductivity has emerged as an area of deep interest. This phenomenon, where a material's electrical conductivity is modulated by light, unfolds in a captivating narrative through the exploration of complex oxide hetero-structures. These structures, formed by growing film oxides hetro-structures of distinct oxide materials with unique electronic and optical properties, offer a rich playground for investigating novel electronic phases, quantum phenomena, and optoelectronic behaviors. By manipulating interfaces and film thickness, researchers unlock the potential for applications in electronics, spintronics, and energy conversion. This study delves into the captivating properties of LaAlO₃/SrTiO₃, LaNiO₃/SrTiO₃, LaVO₃/SrTiO₃, and LaTiO₃/SrTiO₃ compounds, where photoconductivity reveals its intriguing plane. LaAlO₃/SrTiO₃, for instance, boasts a conducting interface and a 2D electron gas, driven by polar discontinuity and charge transfer. LaNiO₃/SrTiO₃, on the other hand, exhibits a conducting interface with notable photo response, while LaVO₃/SrTiO₃ and LaTiO₃/SrTiO₃ offer their unique photoconductivity properties.The mechanisms driving photoconductivity, from charge separation to carrier transport, are unraveled, offering insights into their intricate behaviors. Applications span a wide spectrum, from highmobility transistors to Photovoltaic cell, fuel cells, and beyond, with each compound presenting a unique set of possibilities as we look to the future, the promise of these compounds shines brightly, with ongoing research poised to enhance their properties and expand their horizons. The journey, marked by captivating narratives and intricate interplays, leaves us standing at the cusp of discovery, ready to revels the full potential of these materials in the realm of optoelectronics.
These hetero-structures offer a rich playground for unraveling novel electronic phases, quantum peculiarities, and the wondrous world of optoelectronic properties [2]. By masterfully crafting these interfaces and fine-tuning film thickness, researchers wield the power to manipulate electronic traits, giving birth to functionalities unseen in bulk materials. This mastery holds promises spanning various domains, including electronics, spintronics, and the realm of energy conversion. Among these complex oxide wonders, one star takes the spot light: the LaAlO₃/SrTiO₃ (LAO/STO) system [4]. Extensively explored for its beguiling attributes, this duo showcases a conducting interface and a 2D electron gas (2DEG) brought to life by the charge transfer due to polar discontinuity at the LAO/STO interface [5]. This 2DEG in LAO/STO exhibits a splendid property of photoconductivity, with its electrical conductance swaying dramatically under the influence of light's gentle caress [6]. This intriguing response to photons is a result of a complex interplay involving the injection of photogenerated carriers, their entrapment and liberation, and transformative alterations to the electronic band structure, all choreographed by the whims of light [7]. LAO/STO holds within it the promise of illuminating optoelectronic devices, such as photodetectors and solar cells [8]. But the stage doesn't belong solely to LAO/STO; there's another dynamic duo in the spotlight, the LaNiO₃/SrTiO₃ (LNO/STO) system. LNO, with its impressive conductivity and a penchant for absorbing light in the visible and near-infrared spectrum, takes center stage [9]. When LNO elegantly layers itself onto the STO substrate, a conducting interface graces us with its presence, boasting captivating photo response behavior LNO/STO's photoconductivity narrative begins with the absorption of photons, birthing electron-hole pairs that gracefully traverse the interface, harmoniously contributing to the overall photoconductivity [10].
Key Words: Photoconductivity, Thin-film, LaAlO₃/SrTiO₃, LaNiO₃/SrTiO₃, LaVO₃/SrTiO₃, and LaTiO₃/SrTiO₃
1.INTRODUCTION Photoconductivity, a fascinating phenomenon where light alters a material’s electrical behavior, has intrigued researchers in materials science and solid-state physics. The intricate makeup of complex oxide heterostructures has become a captivating realm for delving into the mysteries of photoconductivity, thanks to their special combination of electronic and optical properties. Complex oxide heterostructures have emerged as promising arenas for probing into the enigma of photoconductivity, owing to their unique blend of electronic and optical characteristics [1]. These
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This performance places LNO/STO firmly on the map as a promising candidate for photodetection and photovoltaic exploits [11]. Not to be overshadowed, the LVO/STO and LTO/STO hetero-structures gracefully waltz onto the scene,
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