A-π-D-π-A type small molecule donors for high performance bulk heterojunction organic photovoltaics
Ruttapol Malatong 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, Ruttapol Malatong, 202
Publication date: 11th February 2019




Organic photovoltaics (OPVs) have attracted much attention as energy-converting devices due to their potential in low cost production, light weight, flexibility, and ease of synthesis. Bulk heterojunction (BHJ) is one of the most promising device architectures that is fabricated from spin-coated mixed layer of donor and acceptor molecules. Such efforts on materials and device optimizations led to the enhancement of power conversion efficiencies (PCEs). Herein, we reported the synthesis and characterizations of A-π-D-π-A type small molecule donor for OPVs. The new molecular donors having alkyl thienyl-substituted benzodithiophene (BDT) as donor, bis(thiophe-2-nyl)thienodioxepine (BTD) as π-spacer and different accepting groups with dicyanomethyleneindanone (DCI) and ethylrhodamine (ER), namely BDT-BTD-DCI and BDT-BTD-ER were designed, synthesized, and characterized, respectively. Their optical, electrochemical properties, and mixed thin film morphology were investigated. The photovoltaic performances of both compounds were evaluated by fabricating the BHJ devices with ITO/PEDOT:PSS/BDT-BTD-DCI:PCBM/BCP/Al and ITO/PEDOT:PSS/BDT-BTD-ER:PCBM/BCP/Al. The donors (BDT-BTD-DCI, BDT-BTD-ER) and acceptors (PCBM) molecules mixed in a well-controlled way in photoactive layer which was optimized by varying ratio of donor/acceptor to enhance device performance. The above results demonstrated that both small molecules are promising in high performance organic photovoltaic applications.


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