Optoelectronic and current-voltage studies for novel coumarin dyes

ABSTRACT

Coumarin derivatives are used in a wide range of applications, such as optoelectronics, photovoltaics and dye lasers. Therefore they have attracted significant research interest. In this regard, novel coumarin dye molecules were synthesised and characterised by spectroscopic techniques. The synthesised dyes were studied for optical (linear and nonlinear), frontier molecular orbital analysis (using cyclic voltammetry and DFT calculations) and the current-voltage (I-V) studies for photosensitization behaviour on TiO₂ nanoparticles. The TiO₂ nanoparticles were synthesised by the sol-gel method and characterised by XRD, EDAX and SEM analysis. The results showed that the dye molecules possess good light-absorbing capability with a high molar absorption coefficient and also exhibited the good nonlinear optical (NLO) response. Moreover, the I-V characteristics suggest the efficacy of synthesised dyes for photovoltaic applications.

KEYWORDS:

• Coumarins
• TiO₂
• band gap
• NLO
• I–V characteristics

Acknowledgments

Authors are thankful to UGC-SWRO and Department of Collegiate Education-Bangalore for selecting under UGC-FIP scheme. The authors are also thankful to DST (SERB), New Delhi, UGC New Delhi, for providing the instrumental facility. Authors also thankful to Aninamol Ani for his support during NLO analysis.

Disclosure statement

No potential conflict of interest was reported by the authors.

Supplementary Materials

Supplemental data for this article can be accessed here.

Additional information

Funding

This work was not supported by any funding.