1567672-73-4Relevant academic research and scientific papers
Rational design of triphenylamine dyes for highly efficient p-type dye sensitized solar cells
Zhu, Linna,Yang, Hong Bin,Zhong, Cheng,Li, Chang Ming
, p. 97 - 104 (2014/03/21)
Two new sensitizers based on triphenylamine-dicyanovinylene have been synthesized and used for p-type dye-sensitized solar cells. The best performance amongst solar cells was achieved by the dye with a ter-thiophene bridge ligand between carboxylic acid group and the triphenylamine part (with power conversion efficiency of 0.19%, short circuit current of 4.01 mA cm-2, open circuit voltage at 144 mV, and fill factor of 0.33). Results indicate that the ter-thiophene groups in the dyes strongly affects both charge recombination and hole injection in the photoelectrode. In addition, the hexyl chains on the bridged thiophene rings also help to avoid dye aggregation on the nickel oxide film and block I- in electrolyte from approaching the surface of nickel oxide, which leads to a reduction in the charge recombination between nickel oxide semiconductor and electrolyte. This study suggested that modification of the bridge moiety between triphenylamine and the carboxylic group by increasing thiophene units is a promising way for preventing charge recombination and increasing the power conversion efficiency.
Elucidating the structure-property relationships of donor-π-acceptor dyes for dye-sensitized solar cells (DSSCs) through rapid library synthesis by a one-pot procedure
Fuse, Shinichiro,Sugiyama, Sakae,Maitani, Masato M.,Wada, Yuji,Ogomi, Yuhei,Hayase, Shuzi,Katoh, Ryuzi,Kaiho, Tatsuo,Takahashi, Takashi
supporting information, p. 10685 - 10694 (2014/11/08)
The creation of organic dyes with excellent high power conversion efficiency (PCE) is important for the further improvement of dye-sensitized solar cells. We wish to describe the rapid synthesis of a 112-membered donor-π-acceptor dye library by a one-pot procedure, evaluation of PCEs, and elucidation of structure-property relationships. No obvious correlations between ε, and the η were observed, whereas the HOMO and LUMO levels of the dyes were critical for η. The dyes with a more positive EHOMO, and with an ELUMOsc, and it was the most important parameter for a high η. The above criteria of EHOMO and E LUMO should be useful for creating high PCE dyes; nevertheless, that was not sufficient for identifying the best combination of donor, π, and acceptor blocks. Combinatorial synthesis and evaluation was important for identifying the best dye. Combinatorial chemistry: A 112-membered donor-π-acceptor dye library was rapidly constructed by a one-pot, three-component coupling procedure (see scheme, SM=Suzuki-Miyaura). The evaluation of absorption spectroscopic and electrochemical measurements of all synthesized dyes, and cell performances of the selected 54 dyes were performed. The dyes with a more positive EHOMO, and with an E LUMO-0.80 V, exerted higher power conversion efficiencies.
