Synergistic effects of buffer layer processing additives for enhanced hole carrier selectivity in inverted Organic Photovoltaics |
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| Authors: | Achilleas Savva Marios Neophytou Charalambos Koutsides Kyriacos Kalli Stelios A Choulis |
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| Affiliation: | 1. Molecular Electronics and Photonics Research Unit, Department of Mechanical Engineering and Materials Science and Engineering, Cyprus University of Technology, Kitiou Kiprianou str. 45, 3603 Limassol, Cyprus;2. Nanophotonics Research Laboratory, Department of Electrical Engineering, Computer Engineering and Informatics, Cyprus University of Technology, Kitiou Kiprianou str. 45, 3603 Limassol, Cyprus |
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| Abstract: | Solution based inverted Organic Photovoltaic (OPVs) usually use Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) derivatives combined with pristine processing additives as hole selective contact on top of the hydrophobic conjugated polymer:fullerene active layer. In this study, PEDOT:PSS based hole selective contact is treated with two different boiling point additives, 2,5,8,11-tetramethyl-6-dodecyn-5,8-diol ethoxylate (Dynol) and Zonyl FS-300 fluorosurfactant (Zonyl). Although corresponding inverted OPVs using the above PEDOT:PSS:Additives show similar power conversion efficiency (PCE) values, the mechanisms of their implementation on inverted OPV operation are not identical. By understanding the synergistic effects of PEDOT:PSS processing additives on the hole selectivity of inverted OPVs we demonstrate a novel combination of PEDOT:PSS additives mixture as an effective route to further increase the hole selectivity, reliability andpower conversion efficiency of inverted OPVs. |
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| Keywords: | Inverted organic solar cells Printed electronics Solution based electronic materials Interfaces Processing additives PEDOT:PSS buffer layers |
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