title: Enhanced Photovoltaic Performances of Dye-Sensitized Solar Cells by Co-Sensitization of Benzothiadiazole and Squaraine-Based Dyes.
abstract: Dye-sensitized solar cells (DSSCs) based on a donor-acceptor-donor oligothienylene dye containing benzothiadiazole (T4BTD-A) were cosensitized with dyes containing cis-configured squaraine rings (HSQ3 and HSQ4). The cosensitized dyes showed incident monochromatic photon-to-current conversion efficiency (IPCE) greater than 70% in the 300-850 nm wavelength region. The individual overall conversion efficiencies of the sensitizers T4BTD-A, HSQ3, and HSQ4 were 6.4%, 4.8%, and 5.8%, respectively. Improved power conversion efficiencies of 7.0% and 7.7% were observed when T4BTD-A was cosensitized with HSQ3 and HSQ4, respectively, thanks to a significant increase in current density (JSC) for the cosensitized DSSCs. Intensity-modulated photovoltage spectroscopy results showed a longer lifetime for cosensitized T4BTD-A+HSQ3 and T4BTD-A+HSQ4 compared to that of HSQ3 and HSQ4, respectively.
authors.affiliation: Photovoltaic Materials Unit, National Institute for Materials Science , 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan.
authors.forename: Ashraful
authors.initials: A
authors.lastname: Islam
authors.affiliation: Solar Energy Research Institute (SERI), Universiti Kebangsaan Malaysia (UKM) , Bangi 43600, Selangor Darul Ehsan, Malaysia.
authors.forename: Md
authors.initials: M
authors.lastname: Akhtaruzzaman
authors.affiliation: Solar Energy Research Institute (SERI), Universiti Kebangsaan Malaysia (UKM) , Bangi 43600, Selangor Darul Ehsan, Malaysia.
authors.forename: Towhid H
authors.initials: TH
authors.lastname: Chowdhury
authors.affiliation: Photovoltaic Materials Unit, National Institute for Materials Science , 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan.
authors.forename: Chuanjiang
authors.initials: C
authors.lastname: Qin
authors.affiliation: Photovoltaic Materials Unit, National Institute for Materials Science , 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan.
authors.forename: Liyuan
authors.initials: L
authors.lastname: Han
authors.affiliation: CRC, Optometry Department, College of Applied Medical Sciences, King Saud University , Riyadh 11433, Saudi Arabia.
authors.forename: Idriss M
authors.initials: IM
authors.lastname: Bedja
authors.affiliation: Department of Chemistry, Center for Macromolecular Science and Engineering, University of Florida , Gainesville, Florida 32611, United States.
authors.forename: Romain
authors.initials: R
authors.lastname: Stalder
authors.affiliation: Department of Chemistry, Center for Macromolecular Science and Engineering, University of Florida , Gainesville, Florida 32611, United States.
authors.forename: Kirk S
authors.initials: KS
authors.lastname: Schanze
authors.affiliation: Department of Chemistry, Center for Macromolecular Science and Engineering, University of Florida , Gainesville, Florida 32611, United States.|School of Chemistry and Biochemistry and School of Materials Science and Engineering, Center for Organic Photonics and Electronics, Georgia Tech Polymer Network, Georgia Institute of Technology , Atlanta, Georgia 30332, United States.
authors.forename: John R
authors.initials: JR
authors.lastname: Reynolds
keywords: benzothiadiazole dye; co-sensitization; dye-sensitized solar cell; incident photon to current conversion efficiency; squaraine dye