Abstract
Silicon nano-particles grafted with two different organic oligomers were prepared; the oligomers used were a phenylene-vinylene (PV) oligomer and a 3,3'''-didodecylquaterthiophene. The graftings were performed by the use of two different functional groups, the PV oligomer was grafted by a hydroxyl-group in the form of a phenol and a lithium derivative was used to graft the 3,3'''-didodecylquaterthiophene. The morphology and size of the grafted particles were analyzed by atomic force microscopy (AFM) and the extent of the grafting was analyzed by NMR. Organic photovoltaics with normal geometry (ITO/PEDOT:PSS/active layer/Al) were prepared using these materials as a donor and phenyl-C61-butyric acid methyl ester ([60]PCBM) as the acceptor and yielded a power conversion efficiency (PCE) of 0.27%, an open circuit voltage (VOC) of 0.93 V, a short circuit current density (JSC) of 0.89 mA/cm2, and a fill factor (FF) of 32.5% for a lead device with an active area of 0.25 cm2.
Highlights
Organic photovoltaics (OPV) have in the past decade been the subject of increasing interest, primarily due to its potential as a low cost sustainable energy source [1,2,3,4,5]
The I-V curves from the devices prepared with 2 or NP-2 and [60]PCBM showed no or very little photovoltaic properties; the best performing device was NP-2 annealed with a power conversion efficiency (PCE) of 0.001%
Sa = 4.89 nm Silicon nano-particles grafted with two different organic conjugated oligomers were prepared and the nano-particles were investigated by atomic force microscopy (AFM) and NMR to verify the creation of nano-particles and the grafting of oligomers
Summary
Andersen 1, Quanxiang Yan 2,3, Thue T. Larsen-Olsen 1, Roar Søndergaard 1, Qi Li 2, Birgitta Andreasen 1, Kion Norrman 1, Mikkel Jørgensen 1, Wei Yue 3, Donghong Yu 3, Frederik C. Krebs 1, Hongzheng Chen 2 and Eva Bundgaard 1,*
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