<abstract xmlns="http://www.w3.org/1999/xhtml">Rice shaped ZnO nanoparticles have been synthesized for the first time by a biological process using <italic>Amorphophallus konjac</italic> tuber extract and used as a photoanode in a dye sensitized solar cell. The glucomannan present in aqueous tuber extract acted as a reducing agent in the synthesis process, further it also acted as a template which modified and controlled the shape of the nanoparticles. The synthesized nanoparticles were dried by microwave irradiation followed by annealing at 400 °C. The FESEM and TEM images confirmed that the synthesized ZnO nanoparticles had rice shaped morphology. Furthermore, the X-ray diffraction studies revealed that the prepared ZnO nanoparticles exhibited wurtzite phase with average particle size of 17.9 nm. The UV-Vis spectroscopy studies confirmed the value of band gap energy of biosynthesized ZnO nanoparticles as 3.11 eV. The photoelectrodes for dye sensitized solar cells were prepared with the biosynthesized ZnO nanoparticles using doctor blade method. The photoelectrode was sensitized using the fruit extract of <italic>Terminalia catappa</italic>, flower extracts of <italic>Callistemon citrinus</italic> and leaf extracts of <italic>Euphorbia pulcherrima</italic>. The dye sensitized solar cells were fabricated using the sensitized photoelectrode and their open circuit voltages and short circuit current densities were found to be in the range of 0.45 V to 0.55 V and 5.6 mA/cm2 to 6.8 mA/cm2, respectively. Thus, the photovoltaic performances of all the natural dye sensitized ZnO solar cells show better conversion efficiencies due to the morphology and preparation technique.</abstract>

Rice shaped ZnO nanoparticles have been synthesized for the first time by a biological process using Amorphophallus konjac tuber extract and used as a photoanode in a dye sensitized solar cell. The glucomannan present in aqueous tuber extract acted as a reducing agent in the synthesis process, further it also acted as a template which modified and controlled the shape of the nanoparticles. The synthesized nanoparticles were dried by microwave irradiation followed by annealing at 400 °C. The FESEM and TEM images confirmed that the synthesized ZnO nanoparticles had rice shaped morphology. Furthermore, the X-ray diffraction studies revealed that the prepared ZnO nanoparticles exhibited wurtzite phase with average particle size of 17.9 nm. The UV-Vis spectroscopy studies confirmed the value of band gap energy of biosynthesized ZnO nanoparticles as 3.11 eV. The photoelectrodes for dye sensitized solar cells were prepared with the biosynthesized ZnO nanoparticles using doctor blade method. The photoelectrode was sensitized using the fruit extract of Terminalia catappa, flower extracts of Callistemon citrinus and leaf extracts of Euphorbia pulcherrima. The dye sensitized solar cells were fabricated using the sensitized photoelectrode and their open circuit voltages and short circuit current densities were found to be in the range of 0.45 V to 0.55 V and 5.6 mA/cm2 to 6.8 mA/cm2, respectively. Thus, the photovoltaic performances of all the natural dye sensitized ZnO solar cells show better conversion efficiencies due to the morphology and preparation technique.

Microwave assisted biosynthesis of rice shaped ZnO nanoparticles using <italic>Amorphophallus konjac</italic> tuber extract and its application in dye sensitized solar cells

Materials Science-Poland

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Microwave assisted biosynthesis of rice shaped ZnO nanoparticles using  tuber extract and its application in dye sensitized solar cells

Rice shaped ZnO nanoparticles have been synthesized for the first time by a biological process using Amorphophallus konjac tuber extract and used as a...

Dye extract/Solar	V_oc	J_sc	Fill	Efficiency
cell parameters	[V]	[mA/cm²]	factor	[%]
Callistemon citrinus	0.5	4.9	0.5857	1.43±2.4
Terminalia catappa	0.45	5.6	0.656	1.63±2.4
Euphorbia pulcherrima	0.55	6.8	0.4461	1.66±2.4

Microwave assisted biosynthesis of rice shaped ZnO nanoparticles using Amorphophallus konjac tuber extract and its application in dye sensitized solar cells

Published Online: Feb 24, 2017

Page range: 111 - 119

Received: Jun 30, 2016

Accepted: Jan 17, 2017

DOI: https://doi.org/10.1515/msp-2017-0029

Keywords
green synthesis, Amorphophallus konjac tubers extract, rice shaped ZnO nanoparticle, dye sensitized solar cell; natural dye, XRD

© 2017 Naresh Kumar P., Sakthivel K., Balasubramanian V.

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Solar cell parameters of fabricated ZnO based solar cells.

Microwave assisted biosynthesis of rice shaped ZnO nanoparticles using Amorphophallus konjac tuber extract and its application in dye sensitized solar cells

Published Online: Feb 24, 2017

Page range: 111 - 119

Received: Jun 30, 2016

Accepted: Jan 17, 2017

DOI: https://doi.org/10.1515/msp-2017-0029

Keywordsgreen synthesis, Amorphophallus konjac tubers extract, rice shaped ZnO nanoparticle, dye sensitized solar cell; natural dye, XRD

© 2017 Naresh Kumar P., Sakthivel K., Balasubramanian V.

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Solar cell parameters of fabricated ZnO based solar cells.

Keywords
green synthesis, Amorphophallus konjac tubers extract, rice shaped ZnO nanoparticle, dye sensitized solar cell; natural dye, XRD