Structural and optical properties of V 2 O 5 nanostructures grown by thermal decomposition technique
- PDF / 1,182,168 Bytes
- 6 Pages / 595.276 x 790.866 pts Page_size
- 0 Downloads / 220 Views
Structural and optical properties of V2O5 nanostructures grown by thermal decomposition technique K. M. Shafeeq1 · V. P. Athira1 · C. H. Raj Kishor1 · P. M. Aneesh1 Received: 28 March 2020 / Accepted: 28 June 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Vanadium pentoxide ( V2O5) is a widely used industrial catalyst and a promising substitute to the acidic and hygroscopic PEDOT: PSS hole transport layer in organic solar cells. In this work, V 2O5 nanostructures were synthesized by thermal decomposition of ammonium metavanadate (NH4VO3) at various temperatures. Structural and morphological studies confirmed the formation of orthorhombic structure of V 2O5 nanorods. The UV–Vis–NIR reflectance spectra show a temperature dependent red-shift in band gap corresponding to indirect optical transitions. The peaks corresponding to band edge emissions were obtained from photoluminescence spectra. From Fourier-transform infrared (FTIR) studies, the vibrational modes involved in V2O5 nanostructures were identified. Temperature dependence of the precursor NH4VO3 was evaluated from thermogravimetric–differential (TGA/DTA) curves. Keywords Vanadium pentoxide · Nanorods · X-ray diffraction · Optical properties · Organic solar cells
1 Introduction Solar cells are devices that generate electric current when exposed to the light through photovoltaic effect. Development of conductive organic polymers led to the discovery of organic solar cells which made solar cells more flexible, light weight and cost effective [1, 2]. Fabrication of solar cells with organic materials improved the solar cell (or photovoltaic) technology to generate electricity in a cheaper way. Organic solar cells (OSCs) are made up of an active material along with different inorganic or organic interfacial layers. Organic solar cells are now gaining more interest due to their low production cost, mechanical stability, flexibility and light weight. Previously, the power conversion efficiency and stability of OSCs are much lower to the inorganic counterparts [3]. Using the inorganic interfacial layers like V2O5, MoO3, ZnO, etc. in solar cells, the performance and stability have been improved and these materials can be easily deposited through simple solution processes [4].
* P. M. Aneesh [email protected] 1
Department of Physics, Central University of Kerala, Tejaswini Hills, Periye, Kasaragod, Kerala 671320, India
In OSCs, the role of an interfacial layer is to transport holes or electrons with less contact resistance between the active layer and respective electrode. V 2O5 thin films are used as hole transport layer (HTL) in organic solar cells due to its lower band gap (2.3 eV) [5]. PEDOT: PSS is the commonly used hole transport layer in organic solar cells which is a costly organic material and it is not much stable on ITO electrode surface due to its acidic and hygroscopic nature causes etching of ITO coating on the substrate, thus affecting the overall performance of a solar cell. Moreover, the oxidation
Data Loading...
