Naphthothiadiazole Core Flanked with Furan and Thiophene as Small Molecule Donor for High Performance Solution-processed Bulk Heterojunction Solar Cells
Anna Pachariyangkun a, Taweesak Sudyoadsuk a, Vinich Promarak a
a Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC)
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Poster, Anna Pachariyangkun, 198
Publication date: 11th February 2019

Organic photovoltaics (OPVs) have emerged as an alternative energy conversion electronics to inorganic electronics due to their lower cost of production, easy processing, light-weight, and flexibility. Bulk heterojunction (BHJ) solar cell is one device architecture of OPVs where a lot of efforts have been made in tuning molecular designs for both organic semiconductor donor and acceptor materials to achieve high power conversion efficiency. Naphthothiadiazole core flanked with furan and thiophene small molecules, F-NT-F and T-NT-T respectively, were designed and synthesized for high performance solution-processed BHJ solar cell. This study explores the photovoltaic properties of the small molecules (F-NT-F and T-NT-T) as a donor with a fullerene derivative as an acceptor. The donor small molecules were successfully synthesized, and their optical and electrochemical properties were investigated by UV-Visible spectroscopy, fluorescence spectrometry, and cyclic voltammetry. Both compounds showed broad absorption, but T-NT-T showed extended absorption to about 800 nm. The BHJ solar cells were fabricated using device configuration of ITO/PEDOT:PSS/photoactive layer/BCP/Al. The photoactive layer was optimized by varying the donor to acceptor ratio and using diiodo-octane (DIO) as solvent additives. The small molecules showed promising application in organic photovoltaics.

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