Title: Reducing exciton-polaron annihilation in organic planar heterojunction solar cells
Authors: Verreet, Bregt ×
Bhoolokam, Ajay Sampath
Brigeman, Alyssa
Dhanker, Rijul
Cheyns, David
Heremans, Paul
Stesmans, Andre
Giebink, Noel C
Rand, Barry P #
Issue Date: 2014
Publisher: Published by the American Physical Society through the American Institute of Physics
Series Title: Physical Review B, Condensed Matter and Materials Physics vol:90 issue:11 pages:1-8
Article number: 115304
Abstract: We investigate the relationship between charge concentration, exciton concentration, and photocurrent generation in fullerene-containing heterojunction diodes. Impedancemeasurements on C60 diodes reveal a charge buildup at the C60/bathocuproine (BCP) interface that can be swept out under reverse bias. In solar cell structures, a similar charge buildup is observed in dark conditions, and increases as a function of incident light intensity. Photoluminescence measurements reveal that the C60 exciton concentration is voltage dependent, explained via the process of exciton-polaron annihilation. This process has a negative impact on the generated photocurrent of the solar cells and thereby decreases the fill factor. A combination of electroabsorption, photoluminescence, and impedance measurements reveal a decrease in charge buildup and the associated exciton-polaron annihilation through the use of a BCP/3,4,9,10-perylenetetracarboxylic bis-benzimidazole/Ag cathode.
ISSN: 1098-0121
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Semiconductor Physics Section
ESAT - MICAS, Microelectronics and Sensors
× corresponding author
# (joint) last author

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