Abstract
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 Royal Society of Chemistry 2014
| Original language | English |
|---|---|
| Pages (from-to) | 7656-7665 |
| Number of pages | 10 |
| Journal | Journal of Materials Chemistry C |
| Volume | 2 |
| Issue number | 36 |
| Online published | 7 Aug 2014 |
| DOIs | |
| Publication status | Published - 28 Sept 2014 |
| Externally published | Yes |
Funding
V.W.-W.Y. acknowledges support from the URC Strategic Research Theme on New Materials. C.-Y.C and Y.-C. W. acknowledge the receipt of postgraduate studentships, and H.-L. W. the receipt of a University Postdoctoral Fellowship, all from The University of Hong Kong. This work was fully supported by the University Grants Committee Areas of Excellence Scheme (AoE/P-03/08). We are grateful to Prof. W.-Y. Wong at the Hong Kong Baptist University for his assistance in MALDI-TOF mass spectrometry measurements.
