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Dead ends limit charge carrier extraction from all-polymer bulk heterojunction solar cells

Extraction of photocreated charge carriers from a prototypical all-polymer organic solar cell is investigated by combining transient photocurrent and time-delayed collection field experiments with numerical simulations. It is found that extraction is significantly hampered by charges getting trapped...

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Main Authors: Jasiūnas, Rokas (Author) , Melianas, Armantas (Author) , Xia, Yuxin (Author) , Felekidis, Nikolaos (Author) , Gulbinas, Vidmantas (Author) , Kemerink, Martijn (Author)
Format: Article (Journal)
Language:English
Published: 26 June 2018
In: Advanced electronic materials
Year: 2018, Volume: 4, Issue: 8
ISSN:2199-160X
DOI:10.1002/aelm.201800144
Online Access:Verlag, Volltext: https://doi.org/10.1002/aelm.201800144
Verlag, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1002/aelm.201800144
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Author Notes:Rokas Jasiūnas, Armantas Melianas, Yuxin Xia, Nikolaos Felekidis, Vidmantas Gulbinas, and Martijn Kemerink

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520 |a Extraction of photocreated charge carriers from a prototypical all-polymer organic solar cell is investigated by combining transient photocurrent and time-delayed collection field experiments with numerical simulations. It is found that extraction is significantly hampered by charges getting trapped in spatial traps that are tentatively attributed to dead ends in the intermixed polymer network—in photovoltaic devices based on the same donor polymer and a fullerene acceptor this effect is much weaker. The slow-down in charge extraction leads to enhanced recombination and associated performance losses. These effects are observed in addition to the dispersive behavior that is characteristic of charge motion in energetically disordered media. Upon annealing the effects of spatial traps diminish, rationalizing the doubling in device power conversion efficiency after annealing. 
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