Title: Decreased Recombination Through the Use of a Non-Fullerene Acceptor in a 6.4% Efficient Organic Planar Heterojunction Solar Cell
Authors: Verreet, Bregt
Cnops, Kjell
Cheyns, David
Heremans, Paul
Stesmans, Andre
Zango, German
Claessens, Christian G
Torres, Tomas
Rand, Barry P #
Issue Date: 2014
Publisher: Wiley-VCH
Series Title: Advanced Energy Materials vol:4 issue:8 pages:1-8
Article number: 1301413
Abstract: An optimization of several aspects of planar heterojunction solar cells based on boron subnaphthalocyanine chloride (SubNc) as a donor material is presented. The use of hexachlorinated boron subphthalocyanine chloride (Cl-6 SubPc) as an alternative acceptor to C-60 allows for the simultaneous increase of the short-circuit current, fill factor, and open-circuit voltage compared to cells with fullerene acceptors. This is due to the complementary absorption of Cl-6 SubPc versus SubNc, reduced recombination at the hetero-interface, and improved energetic alignment. Furthermore, insertion of a thin diindeno[1,2,3-cd:1', 2', 3'-lm] perylene (DIP) layer at the anode results in a very significant 60% increase in photocurrent owing to reduced exciton quenching at the anode. The simultaneous improvement of all three solar cell parameters results in a power conversion efficiency of 6.4% for a non-fullerene planar heterojunction cell.
ISSN: 1614-6832
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Semiconductor Physics Section
ESAT - MICAS, Microelectronics and Sensors
# (joint) last author

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