Title: Host: guest systems for triplet sensibilization in organic photovoltaic applications ,,
Other Titles: Gast: gastheersystemen voor triplet sensibilisatie in organische fotovoltaïsche toepassingen
Authors: Baeten, Yannick
Issue Date: 12-Oct-2016
Abstract: Organic photovoltaics (OPVs) have been a point of research for over thirty decades now, with a strong emphasis on performance increase. An important step in this performance increase is the bulk heterojunction architecture adopted by the majority of researcher in the field. The bulk heterojunction is used to alleviate the problem of the limited exciton diffusion length of the excitons formed in organic material. Although the bulk heterojuction leads to higher power conversion efficiencies, it also introduces a problem to the system. The optimal bulk heterojunction is hard to optimize and is often metastable. This can lead to difficult production processes and a drastic decrease in performance over the device lifetime. An alternative solution would be to increase the exciton diffusion length by converting the singlet excitons formed in organic materials to triplet excitons, which are known for possessing longer exciton diffusion lengths due to their longer life time. We have opted to use a cascade system to introduce the triplet excitons. We add a dopant molecule with an efficient intersystem crossing (ISC) and a singlet energy level below that of the polymer but a triplet energy level above that of the polymer. This should ensure that the singlet exciton formed on the polymer is transferred to the dopant, converted to a triplet exciton and transferred back to the polymer.
Publication status: published
KU Leuven publication type: TH
Appears in Collections:Molecular Imaging and Photonics
ESAT - MICAS, Microelectronics and Sensors

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