Band offset at TiO2/MDMO PPV and TiO2/PEDOT PSS interfaces studied using photoelectron spectroscopy. Issue 118 (18th November 2015)

• Record Type: Journal Article
• Authors: Ajimsha, R. S.; Joshi, M. P.; Mohan, S. Raj; Das, Amit. K.; Misra, P.; Kukreja, L. M.; Phase, D. M.
• Is Part Of: RSC advances. Volume 5:Issue 118(2015)
• Page Start: 97891
• Page End: 97897
• Publication Date: 2015-11-18
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c5ra21227h
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : We report band alignment and band offset studies across the interfaces of hetero-structures of TiO2 with MDMO PPV and PEDOT PSS using photoelectron spectroscopy. Abstract : We report band alignment and band offset studies across the interfaces of hetero-structures of TiO2 with poly[2-methoxy-5-(3′, 7′-dimethyl-octyloxy)- p -phenylene vinylene] (MDMO PPV) and poly(styrenesulfonate) doped poly(3, 4-ethylenedioxythiophene) (PEDOT PSS) using photoelectron spectroscopy. In both the cases the band alignment was found to be type II with significant band bending in the range 0.2 to 0.3 eV. In the case of the TiO2 /MDMO PPV hetero-structure, the valance band offset (VBO)/conduction band offset (CBO) were found to be 2.68 ± 0.1 eV/1.68 ± 0.1 eV, while the TiO2 /PEDOT PSS hetero-structure exhibited VBO/CBO as 2.3 ± 0.1 eV/0.7 ± 0.1 respectively. Based on these results, schematic band diagrams for these organic/inorganic hetero-structures were proposed. Our studies are important for the optimum design of various photovoltaic devices based on these organic/inorganic hetero-junctions.