Proceedings of nanoGe September Meeting 2015 (NFM15)
Publication date: 8th June 2015
The organic solar cells built of two organic materials, mostly polymeric donor and fullerene derivative acceptor –[6,6]-phenyl C61 butyric acid methyl ester (PCBM), are promising, cost-effective way to harness solar energy. The electron-hole pairs called excitons generated in either phase dissociate through charge transfer at the polymer/PCBM interface. A photo-induced charge transfer process is a crucial step in the organic solar cells operations.We present the studies of charge transfer in polymers and PCBM bulk heterojunctions. As polymers, commercially available regioregular poly(3-hexylthiophene-2,5-diyl), commonly known as P3HT, and different polyazomethines, obtained in the Electrotechnical Institute, were used. Energy positions of HOMO and LUMO levels for the components of the studied mixtures were determined using density functional theory (DFT) method. Time-resolved spectroscopies: photoluminescence and light induced electron spin resonance were applied to study charge transfer processes in active layer of the bulk heterojunctions. It was found that radiative recombination is governed by two kinetics: the first order kinetic (related to so called geminate recombination) was connected with process of direct recombination within excitons created by illuminating radiation and the second order kinetic (related to so called non-geminate or bimolecular recombination) was assigned to recombination of free carries originating from dissolved excitons. Corresponding relaxation times were determined and compared between the values characteristic for polymers and their mixtures with PCBM. The external quantum efficiency for photovoltaic cells built from the studied mixtures was measured. It was shown that polymer energy gap, proper mutual energy positions of HOMO and LUMO levels for polymer and PCBM, together with carrier mobility within polymer is decisive for increase of external quantum efficiency of photovoltaic cells built from bulk heterojunctions.
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