916246-05-4Relevant articles and documents
Stepwise co-sensitization as a useful tool for enhancement of power conversion efficiency of dye-sensitized solar cells: The case of an unsymmetrical porphyrin dyad and a metal-free organic dye
Sharma,Zervaki,Angaridis,Vatikioti,Gupta,Gayathri,Nagarjuna,Singh, Surya Prakash,Chandrasekharam,Banthiya, Ajita,Bhanuprakash,Petrou,Coutsolelos
, p. 1324 - 1337 (2014)
A tertiary arylamine compound (DC), which contains a terminal cyano-acetic group in one of its aryl groups, and an unsymmetrical porphyrin dyad of the type Zn[Porph]-L-H2[Porph] (ZnP-H2P), where Zn[Porph] and H2[Porph] are metallated and free-base porphyrin units, respectively, and L is a bridging triazine group functionalized with a glycine moiety, and were synthesized and used for the fabrication of co-sensitized dye-sensitized solar cells (DSSCs). The photophysical and electronic properties of the two compounds revealed spectral absorption features and frontier orbital energy levels that are appropriate for use in DSSCs. Following a stepwise co-sensitization procedure, by immersing the TiO2 electrode in separate solutions of the dyes in different sequence, two co-sensitized solar cells were obtained: devices C (ZnP-H2P/DC) and D (DC/ZnP-H 2P).The two solar cells were found to exhibit power conversion efficiencies (PCEs) of 6.16% and 4.80%, respectively. The higher PCE value of device C, which is also higher than that of the individually sensitized devices based on the ZnP-H2P and DC dyes, is attributed to enhanced photovoltaic parameters, i.e. short circuit current (Jsc = 11.72 mA/cm2), open circuit voltage (Voc = 0.72 V), fill factor (FF = 0.73), as it is revealed by photovoltaic measurements (J-V curves) and by incident photon to current conversion efficiency (IPCE) spectra of the devices, and to a higher total dye loading. The overall performance of device C was further improved up to 7.68% (with Jsc = 13.45 mA/cm2, Voc = 0.76 V, and FF = 0.75), when a formic acid treated TiO 2 ZnP-H2P co-sensitized photoanode was employed (device E). The increased PCE value of device E has been attributed to an enhanced Jsc value (=13.45 mA/cm2), which resulted from an increased dye loading, and an enhanced Voc value (=0.76 V), attributed to an upward shift and increased of electron density in the TiO 2 CB. Furthermore, dark current and electrochemical impedance spectra (EIS) of device E revealed an enhanced electron transport rate in the formic acid treated TiO2 photoanode, suppressed electron recombination at the photoanode/dye/electrolyte interface, as well as shorter electron transport time (τd), and longer electron lifetime (τe).
Organic dyes comprising a hydrazone moiety and their use in dye-sensitized solar cells
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Page/Page column 22-23, (2018/01/11)
The present invention relates to compounds of general formula I wherein R100 and R200 are each independently hydrogen, C1-C10-alkyl which in case of C2-alkyl may be interrupted by one and in case of C3-C10-alkyl by one or two nonadjacent oxygen atoms, C5-C7-cycloalkyl, aryl, aryl-C1-C10-alkyl or aryloxy-C1-C10-alkyl, D is an m-valent (m=1, 2 or 3) donor moiety which comprises at least one carbon-carbon or carbon-heteroatom double bond and/or at least one unfused or fused carbo- or heterocyclic ring, A is an acceptor moiety which comprises at least one carbon-carbon or carbon-heteroatom double bond and/or at least one unfused or fused carbo- or heterocyclic ring, and the donor moiety D and the acceptor moiety A are π-conjugated to one another. Furthermore, the present invention relates to the use of compounds of formula I for producing dye-sensitized solar cells and to dye-sensitized solar cells comprising compounds of formula I.
Synthesis and dye sensitized solar cell applications of Bodipy derivatives with bis-dimethylfluorenyl amine donor groups
?akmak, Yusuf,Kolemen, Safacan,Buyuktemiz, Muhammed,Dede, Yavuz,Erten-Ela, Sule
, p. 4086 - 4092 (2015/05/20)
Three Bodipy dyes with strong absorptivities in the visible and near infrared regions were designed, synthesized and their potential as photosensitizers for liquid electrolyte-based dye sensitized solar cells have been evaluated. For the first time Bodipy derivatives with bis-dimethylfluorenyl amine donor groups which were known for their bulky structures as donor groups have been used together. We altered our mostly used triphenylamine group with these and investigated the dye-sensitized solar cell efficiencies of this new class of Bodipy dyes.
