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Transient Absorption Spectroscopy Studies on Polythiophene–Fullerene Bulk Heterojunction Organic Blend Films Sensitized with a Low‐Bandgap Polymer
Authors:Heiko Lö  slein,Tayebeh Ameri,Gebhard J. Matt,Markus Koppe,Hans J. Egelhaaf,Anna Troeger,Vito Sgobba,Dirk M. Guldi,Christoph J. Brabec
Abstract:Recently, the concept of near‐infrared sensitization is successfully employed to increase the light harvesting in large‐bandgap polymer‐based solar cells. To gain deeper insights into the operation mechanism of ternary organic solar cells, a comprehensive understanding of charge transfer–charge transport in ternary blends is a necessity. Herein, P3HT:PCPDTBT:PCBM ternary blend films are investigated by transient absorption spectroscopy. Hole transfer from PCPDTBT‐positive polarons to P3HT in the P3HT:PCPDTBT:PCBM 0.9:0.1:1 blend film can be visualized. This process evolves within 140 ps and is discussed with respect to the proposed charge‐generation mechanisms.
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Keywords:conjugated polymers  organic electronics  photochemistry  solar cells  thin films
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