1245645-82-2Relevant academic research and scientific papers
A new class of three-dimensional, p-type, spirobifluorene-modified perylene diimide derivatives for small molecular-based bulk heterojunction organic photovoltaic devices
Chan, Chin-Yiu,Wong, Yi-Chun,Wong, Hok-Lai,Chan, Mei-Yee,Wing-Wah Yam, Vivian
, p. 7656 - 7665 (2014)
A new class of non-planar and three-dimensional spirobifluorene-modified perylene diimide compounds has been successfully designed and synthesized. The functionalization of the perylene diimide core with different spirobifluorene moieties can alter the molecular geometry as well as extend the spectral coverage into the red region. In addition, these compounds can be utilized as donor materials in combination with fullerene to form bulk heterojunctions, and particularly efficient organic photovoltaic (OPV) devices demonstrating high open-circuit voltages of 0.97 V and a power conversion efficiencies of up to 4% have been prepared. These values are the highest among the cells utilizing p-type perylene diimide as photoactive material in OPV devices. This work opens up a new avenue for the design and synthesis of a new class of p-type perylene diimide compounds that are promising candidates as donor materials in the fabrication of OPV devices. the Partner Organisations 2014.
Efficient triphenylamine-based dyes featuring dual-role carbazole, fluorene and spirobifluorene moieties
Shen, Ping,Tang, Yuhua,Jiang, Shenghui,Chen, Huajie,Zheng, Xiaoyan,Wang, Xueye,Zhao, Bin,Tan, Songting
experimental part, p. 125 - 135 (2011/12/16)
Three triphenylamine-based organic dyes SD6, SD7, and SD8 containing the bulky dual-role moieties (fluorene, carbazole, and spirobifluorene) in the molecular frameworks were synthesized, characterized and applied in dye-sensitized solar cells (DSSCs). The effects of dual-role moieties of organic dyes on their photophysical, electrochemical, and photovoltaic properties have been investigated in detail. These dyes exhibit strong charge transfer absorption bands in the visible region. Their redox potential levels were estimated by cyclic voltammetry and found to suit well to the charge flow in DSSCs. Inserting the dual-role moieties as the secondary donor between the triphenylamine and thiophene units increased the electron density of the donor groups, therefore reduced the HOMO-LUMO band gaps. The combination of ultraviolet-visible (UV-vis) region broad absorption bands with fairly high extinction coefficients and appropriate redox properties observed in these triphenylamine-based dyes make them promising dyes for DSSCs. For a typical solar cell device based on dye SD6, the maximal monochromatic incident photon-to-current conversion efficiency (IPCE) can reach to ～73%, with a short-circuit photocurrent density (Jsc) of 14.25 mA/cm2, an open-circuit photovoltage (Voc) of 0.70 V, and a fill factor (FF) of 0.705, which corresponds to a power conversion efficiency (PCE) of 7.03%.
