Reducing exciton-polaron annihilation in organic planar heterojunction solar cells

Bregt Verreet, Ajay Bhoolokam, Alyssa Brigeman, Rijul Dhanker, David Cheyns, Paul Heremans, Andre Stesmans, Noel Christopher Giebink, Barry P. Rand

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We investigate the relationship between charge concentration, exciton concentration, and photocurrent generation in fullerene-containing heterojunction diodes. Impedance measurements 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.

Original languageEnglish (US)
Article number115304
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number11
DOIs
StatePublished - Sep 4 2014

Fingerprint

Gene Conversion
Excitons
Heterojunctions
heterojunctions
Solar cells
solar cells
excitons
impedance measurement
Photocurrents
photocurrents
Photoluminescence
Diodes
diodes
Fullerenes
photoluminescence
luminous intensity
fullerenes
Cathodes
cathodes
LDS 751

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Verreet, B., Bhoolokam, A., Brigeman, A., Dhanker, R., Cheyns, D., Heremans, P., ... Rand, B. P. (2014). Reducing exciton-polaron annihilation in organic planar heterojunction solar cells. Physical Review B - Condensed Matter and Materials Physics, 90(11), [115304]. https://doi.org/10.1103/PhysRevB.90.115304
Verreet, Bregt ; Bhoolokam, Ajay ; Brigeman, Alyssa ; Dhanker, Rijul ; Cheyns, David ; Heremans, Paul ; Stesmans, Andre ; Giebink, Noel Christopher ; Rand, Barry P. / Reducing exciton-polaron annihilation in organic planar heterojunction solar cells. In: Physical Review B - Condensed Matter and Materials Physics. 2014 ; Vol. 90, No. 11.
@article{84a2ca0fa63b49b4a3e3ddd2cd70ebf5,
title = "Reducing exciton-polaron annihilation in organic planar heterojunction solar cells",
abstract = "We investigate the relationship between charge concentration, exciton concentration, and photocurrent generation in fullerene-containing heterojunction diodes. Impedance measurements 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.",
author = "Bregt Verreet and Ajay Bhoolokam and Alyssa Brigeman and Rijul Dhanker and David Cheyns and Paul Heremans and Andre Stesmans and Giebink, {Noel Christopher} and Rand, {Barry P.}",
year = "2014",
month = "9",
day = "4",
doi = "10.1103/PhysRevB.90.115304",
language = "English (US)",
volume = "90",
journal = "Physical Review B-Condensed Matter",
issn = "1098-0121",
publisher = "American Physical Society",
number = "11",

}

Verreet, B, Bhoolokam, A, Brigeman, A, Dhanker, R, Cheyns, D, Heremans, P, Stesmans, A, Giebink, NC & Rand, BP 2014, 'Reducing exciton-polaron annihilation in organic planar heterojunction solar cells', Physical Review B - Condensed Matter and Materials Physics, vol. 90, no. 11, 115304. https://doi.org/10.1103/PhysRevB.90.115304

Reducing exciton-polaron annihilation in organic planar heterojunction solar cells. / Verreet, Bregt; Bhoolokam, Ajay; Brigeman, Alyssa; Dhanker, Rijul; Cheyns, David; Heremans, Paul; Stesmans, Andre; Giebink, Noel Christopher; Rand, Barry P.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 90, No. 11, 115304, 04.09.2014.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Reducing exciton-polaron annihilation in organic planar heterojunction solar cells

AU - Verreet, Bregt

AU - Bhoolokam, Ajay

AU - Brigeman, Alyssa

AU - Dhanker, Rijul

AU - Cheyns, David

AU - Heremans, Paul

AU - Stesmans, Andre

AU - Giebink, Noel Christopher

AU - Rand, Barry P.

PY - 2014/9/4

Y1 - 2014/9/4

N2 - We investigate the relationship between charge concentration, exciton concentration, and photocurrent generation in fullerene-containing heterojunction diodes. Impedance measurements 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.

AB - We investigate the relationship between charge concentration, exciton concentration, and photocurrent generation in fullerene-containing heterojunction diodes. Impedance measurements 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.

UR - http://www.scopus.com/inward/record.url?scp=84907000542&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84907000542&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.90.115304

DO - 10.1103/PhysRevB.90.115304

M3 - Article

VL - 90

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 11

M1 - 115304

ER -