Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 11: Poster: Hybrid and Perovskite Photovoltaics

CPP 11.19: Poster

Montag, 7. März 2016, 18:15–21:00, Poster B2

Ferroelectric organic layers for solar cell applications — •Malgorzata Wawrzyniak-Adamczewska¹ and Malgorzata Wierzbowska² — ¹Faculty of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznan, Poland — ²Institute of Physics, Polish Academy of Sciences (PAS), Al. Lotnikow 32/46, 02-668 Warszawa, Poland

Organic ferroelectric layers and molecular columns, arranged between the graphene sheets, are discussed for the solar cell application. The proposed layers possess many advantageous properties: 1) the cascade energy-levels alignment, 2) simultaneous donor and acceptor character depending on the charge-carrier direction, 3) the charge-transfer excitonic type, 4) the induced polarization of the electrodes, leads to a substantial work-function change (±1.5 eV) of the anode and cathode. The separate-path electron and hole transport is theoretically predicted for the layers and molecular columns. The carrier separation effect allows to deal with the charge recombination problem. The building molecules contain the mesogenic flat aromatic part and the terminal dipole groups which make the system ferroelectric. The diffusion path of the electrons cuts through the aromatic rings, while holes hop between the dipole groups. We verified that the separation of the diffusion paths is not destroyed by the application of the graphene leads. These features make the systems suitable for the efficient solar cells. (arXiv:1510.05220) This work has been supported by The National Science Centre of Poland: the Projects No.2013/11/B/ST3/04041 and DEC-2012/07/B/ST3/03412.