Indacenodithienothiophene-Based ternary organic solar cells

N. Gasparini, A. García-Rodríguez, M. Prosa, S. Bayseç, A. Palma-Cando, A. Katsouras, A. Avgeropoulos, G. Pagona, V.G. Gregoriou, C.L. Chochos, S. Allard, U. Scherf, C.J. Brabec, Taybeh Ameri

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

One of the key aspects to achieve high efficiency in ternary bulk-hetorojunction solar cells is the physical and chemical compatibility between the donor materials. Here, we report the synthesis of a novel conjugated polymer (P1) containing alternating pyridyl[2,1,3]thiadiazole between two different donor fragments, dithienosilole and indacenodithienothiophene (IDTT), used as a sensitizer in a host system of indacenodithieno[3,2-b]thiophene,2,3-bis(3-(octyloxy)phenyl)quinoxaline (PIDTTQ) and [6,6]-phenyl C 70 butyric acid methyl ester (PC 71 BM). We found that the use of the same IDTT unit in the host and guest materials does not lead to significant changes in the morphology of the ternary blend compared to the host binary. With the complementary use of optoelectronic characterizations, we found that the ternary cells suffer from a lower mobility-lifetime (μτ) product, adversely impacting the fill factor. However, the significant light harvesting in the near infrared region improvement, compensating the transport losses, results in an overall power conversion efficiency enhancement of ~7% for ternary blends as compared to the PIDTTQ:PC71BM devices. © 2017 Gasparini, García-Rodríguez, Prosa, Bayseç, Palma-Cando, Katsouras, Avgeropoulos, Pagona, Gregoriou, Chochos, Allard, Scherf, Brabec and Ameri.
Original languageEnglish
JournalFrontiers in Energy Research
Volume4
Issue numberJAN
DOIs
Publication statusPublished - 2017

Keywords / Materials (for Non-textual outputs)

  • Blending
  • Butyric acid
  • Characterization
  • Conjugated polymers
  • Efficiency
  • Infrared devices
  • Solar cells
  • Chemical compatibility
  • IDTT
  • Light-harvesting
  • Near infrared region
  • Optoelectronic characterization
  • Organic electronics
  • Overall power conversion efficiency
  • Ternary devices
  • Organic solar cells

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