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Sanchez, Francelia
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article
Rationally Engineered Vertically Aligned <i>β</i>‐Ga<sub>2−</sub><i><sub>x</sub></i>W<i><sub>x</sub></i>O<sub>3</sub> Nanocomposites for Self‐Biased Solar‐Blind Ultraviolet Photodetectors with Ultrafast Response
Abstract
<jats:title>Abstract</jats:title><jats:p>With the astonishing advancement of present technology and increasing energy consumption, there is an ever‐increasing demand for energy‐efficient multifunctional sensors or transducers based on low‐cost, eco‐friendly material systems. In this context, self‐assembled vertically aligned <jats:italic>β</jats:italic>‐Ga<jats:sub>2−</jats:sub><jats:italic><jats:sub>x</jats:sub></jats:italic>W<jats:italic><jats:sub>x</jats:sub></jats:italic>O<jats:sub>3</jats:sub> nanocomposite (GWO‐VAN) architecture‐assisted self‐biased solar‐blind UV photodetection on a silicon platform, which is the heart of traditional electronics is presented. Utilizing precisely controlled growth parameters, the formation of W‐enriched vertical <jats:italic>β</jats:italic>‐Ga<jats:sub>2−</jats:sub><jats:italic><jats:sub>x</jats:sub></jats:italic>W<jats:italic><jats:sub>x</jats:sub></jats:italic>O<jats:sub>3</jats:sub> nanocolumns embedded into the W‐deficient <jats:italic>β</jats:italic>‐Ga<jats:sub>2−</jats:sub><jats:italic><jats:sub>x</jats:sub></jats:italic>W<jats:italic><jats:sub>x</jats:sub></jats:italic>O<jats:sub>3</jats:sub> matrix is reached. Detailed structural and morphological analyses evidently confirm the presence of <jats:italic>β</jats:italic>‐Ga<jats:sub>2−</jats:sub><jats:italic><jats:sub>x</jats:sub></jats:italic>W<jats:italic><jats:sub>x</jats:sub></jats:italic>O<jats:sub>3</jats:sub> nanocomposite with a high structural and chemical quality. Furthermore, absorption and photoluminescence spectroscopy explains photo‐absorption dynamics and the recombination through possible donor–acceptor energy states. The proposed GWO‐VAN framework facilitates evenly dispersed nanoregions with asymmetric donor energy state distribution and thus forms build‐in potential at the vertical <jats:italic>β</jats:italic>‐Ga<jats:sub>2−</jats:sub><jats:italic><jats:sub>x</jats:sub></jats:italic>W<jats:italic><jats:sub>x</jats:sub></jats:italic>O<jats:sub>3</jats:sub> interfaces. As a result, the overall heterostructure evinces photovoltaic nature under the UV irradiation. A responsivity of ≈30 A/W is observed with an ultrafast response time (≈350 µs) under transient triggering conditions. Corresponding detectivity and external quantum efficiency are 7.9 × 10<jats:sup>12</jats:sup> Jones and 1.4 × 10<jats:sup>4</jats:sup>%, respectively. It is believed that, while this is the first report exploiting GWO‐VAN architecture to manifest self‐biased solar‐blind UV photodetection, the implication of the approach is enormous in designing electronics for extreme environment functionality and has immense potential to demonstrate drastic improvement in low‐cost UV photodetector technology.</jats:p>