Microwave synthesized strontium bismuth niobate Sr1-xSnxBi1.95La0.05Nb2O9 (SSBLN) materials are investigated for non-Debye conduction and photocatalytic response. Lone electron pair repulsions between doping tin (Sn2+) and layer bismuth (Bi3+) generate optimal lattice strain. Lattice oxygen, that is critical in photocatalytic applications, is observed to fold along a-c plane on introducing tin. SSBLN compositions possess higher porosity with reduced dimensions. Porosity derived capacitive boundaries promote polaronic hopping in SSBLN materials over diffused ionic conduction. The visible spectrum photocatalytic response is better after doping tin in SSBLN compositions. Mesoporous network and electron-hole pair generation play crucial role in augmented photocatalytic behaviour of SSBLN materials. © 2020 Elsevier B.V.

Vaibhav Shrivastava

Physics

(SoNS) School of Natural Sciences

Pritam A.

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Shiv Nadar University

Physica B: Condensed Matter

In this work, layered perovskite SBN was investigated in a new-doped form for hole as well as electron transport layer (HTL/ETL) in perovskite solar cells. This work was targeted to determine utility of bismuth layer SBN materials as an active layer in hybrid perovskite solar cells. Thoroughly hard ball-milled compositions Sr1−xSnxBi1.95La0.05Nb2O9 (x = 0.0, 0.01, 0.03, 0.05, 0.1 and 0.2) were prepared by microwave synthesis to obtain fine (~ 10–60 nm) mesoporous particle network of atomic level substitutions. Microwave synthesis was crucial in modifying dielectric, semiconducting and optical characteristics of prepared SBN materials. The optical energy band gap and hall resistivity decreased in continuous manner on tin doping. The role of metallic tin as dopant in sharpening redox peaks and decreasing capacitive reactance of grain boundaries was investigated in detail using cyclic voltammetry and impedance spectroscopy respectively. The tin being more polar covalent than strontium augmented dielectric response too. © 2019, Springer Science+Business Media, LLC, part of Springer Nature.

Fulltext

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