Dispersion-Dominated Photocurrent in Polymer:Fullerene Solar Cells

Melianas, ArmantasLinköpings universitet,Biomolekylär och Organisk Elektronik,Tekniska högskolan,Center of Organic Electronics (COE) (författare)

Funding agencies|Swedish Science Council (VR); Swedish Energy Agency; Knut and Alice Wallenberg foundation; European Social Fund under Global Grant measure
Organic bulk heterojunction solar cells are often regarded as near-equilibrium devices, whose kinetics are set by well-defined charge carrier mobilities, and relaxation in the density of states is commonly ignored or included purely phenomenologically. Here, the motion of photocreated charges is studied experimentally with picosecond time resolution by a combination of time-resolved optical probing of electric field and photocurrent measurements, and the data are used to define parameters for kinetic Monte Carlo modelling. The results show that charge carrier motion in a prototypical polymer:fullerene solar cell under operational conditions is orders of magnitude faster than would be expected on the basis of corresponding near-equilibrium mobilities, and is extremely dispersive. There is no unique mobility. The distribution of extraction times of photocreated charges in operating organic solar cells can be experimentally determined from the charge collection transients measured under pulsed excitation. Finally, a remarkable distribution of the photocurrent over energy is found, in which the most relaxed charge carriers in fact counteract the net photocurrent.

NATURVETENSKAP Fysik Den kondenserade materiens fysik hsv//swe
NATURAL SCIENCES Physical Sciences Condensed Matter Physics hsv//eng
solar cell; organic solar cell; dispersion; photocurrent; charge carrier relaxation; Monte Carlo simulations

Pranculis, VytenisCenter for Physical Sciences and Technology, Lithuania (författare)
Devižis, AndriusCenter for Physical Sciences and Technology, Lithuania (författare)
Gulbinas, VidmantasCenter for Physical Sciences and Technology, Lithuania (författare)
Inganäs, OlleLinköpings universitet,Biomolekylär och Organisk Elektronik,Tekniska högskolan(Swepub:liu)ollin59 (författare)
Kemerink, MartijnLinköpings universitet,Komplexa material och system,Tekniska högskolan,Department of Applied Physics, Eindhoven University of Technology, MB, Eindhoven, The Netherlands(Swepub:liu)marke89 (författare)
Linköpings universitetBiomolekylär och Organisk Elektronik (creator_code:org_t)

Ingår i:Advanced Functional MaterialsWeinheim, Germany : Wiley-VCH Verlagsgesellschaft24:28, s. 4507-45141616-301X1616-3028

Av författaren/redakt...: Melianas, Armant ...; Pranculis, Vyten ...; Devižis, Andrius; Gulbinas, Vidman ...; Inganäs, Olle; Kemerink, Martij ...

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