Current Matching in Multifold DBP/C70 Organic Solar Cells With Open-Circuit Voltages of up to 6.44 V

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

In this paper, we demonstrate a novel method for achieving high open-circuit voltages (Voc) in organic solar cells based on tetraphenyldibenzoperiflanthen (DBP) as donor and fullerene (C70) as acceptor molecules, by fabrication of multifold bilayer single cells stacked on top of each other. As devices based on the material combination of DBP and C70 show relatively high open-circuit voltages of 0.87 V for single junction cells, and as both materials show broad absorption in the visible region pronounced peaks, they become ideal candidates as active layer materials in tandem stacked solar cells. By using a ten-fold bilayer structure of DBP and C70, sandwiched between two electrodes, we reach, in this paper, an open-circuit voltage of up to 6.44 V for a single device, and thus crossing the 5 V limit that is required to power up several low-power consuming devices. Furthermore, by conducting drift-diffusion-based device modeling of the multifold devices, considering also the optical absorption profile in the stacked tandem cell and the effective exciton diffusion lengths, we demonstrate that effective current matching can be obtained in the devices through thickness optimization for each single cell. As a result, we demonstrate that the efficiency of these novel devices can be improved from 3.1% to 4.4% (best performing devices) in the case of a fivefold device structure, mainly due to the strong increase in the short-circuit current density, and thus lead to efficient small molecule-based solar cells high open-circuit voltages.
OriginalsprogEngelsk
TidsskriftIEEE Journal of Photovoltaics
Vol/bind7
Udgave nummer2
Sider (fra-til)1319-1323
ISSN2156-3381
DOI
StatusUdgivet - 20. jul. 2017

Fingeraftryk

open circuit voltage
solar cells
high voltages
cells
short circuit currents
diffusion length
fullerenes
molecules
optical absorption
excitons
current density
conduction
fabrication
optimization
electrodes
profiles

Citer dette

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title = "Current Matching in Multifold DBP/C70 Organic Solar Cells With Open-Circuit Voltages of up to 6.44 V",
abstract = "In this paper, we demonstrate a novel method for achieving high open-circuit voltages (Voc) in organic solar cells based on tetraphenyldibenzoperiflanthen (DBP) as donor and fullerene (C70) as acceptor molecules, by fabrication of multifold bilayer single cells stacked on top of each other. As devices based on the material combination of DBP and C70 show relatively high open-circuit voltages of 0.87 V for single junction cells, and as both materials show broad absorption in the visible region pronounced peaks, they become ideal candidates as active layer materials in tandem stacked solar cells. By using a ten-fold bilayer structure of DBP and C70, sandwiched between two electrodes, we reach, in this paper, an open-circuit voltage of up to 6.44 V for a single device, and thus crossing the 5 V limit that is required to power up several low-power consuming devices. Furthermore, by conducting drift-diffusion-based device modeling of the multifold devices, considering also the optical absorption profile in the stacked tandem cell and the effective exciton diffusion lengths, we demonstrate that effective current matching can be obtained in the devices through thickness optimization for each single cell. As a result, we demonstrate that the efficiency of these novel devices can be improved from 3.1{\%} to 4.4{\%} (best performing devices) in the case of a fivefold device structure, mainly due to the strong increase in the short-circuit current density, and thus lead to efficient small molecule-based solar cells high open-circuit voltages.",
keywords = "Organic semiconductors, Photovoltaic cells, Photovoltaic systems, Solar energy",
author = "Mehrad Ahmadpour and Yiming Liu and Horst-G{\"u}nter Rubahn and Morten Madsen",
year = "2017",
month = "7",
day = "20",
doi = "10.1109/JPHOTOV.2017.2713405",
language = "English",
volume = "7",
pages = "1319--1323",
journal = "IEEE Journal of Photovoltaics",
issn = "2156-3381",
publisher = "IEEE",
number = "2",

}

Current Matching in Multifold DBP/C70 Organic Solar Cells With Open-Circuit Voltages of up to 6.44 V. / Ahmadpour, Mehrad ; Liu, Yiming; Rubahn, Horst-Günter; Madsen, Morten.

I: IEEE Journal of Photovoltaics, Bind 7, Nr. 2, 20.07.2017, s. 1319-1323.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Current Matching in Multifold DBP/C70 Organic Solar Cells With Open-Circuit Voltages of up to 6.44 V

AU - Ahmadpour, Mehrad

AU - Liu, Yiming

AU - Rubahn, Horst-Günter

AU - Madsen, Morten

PY - 2017/7/20

Y1 - 2017/7/20

N2 - In this paper, we demonstrate a novel method for achieving high open-circuit voltages (Voc) in organic solar cells based on tetraphenyldibenzoperiflanthen (DBP) as donor and fullerene (C70) as acceptor molecules, by fabrication of multifold bilayer single cells stacked on top of each other. As devices based on the material combination of DBP and C70 show relatively high open-circuit voltages of 0.87 V for single junction cells, and as both materials show broad absorption in the visible region pronounced peaks, they become ideal candidates as active layer materials in tandem stacked solar cells. By using a ten-fold bilayer structure of DBP and C70, sandwiched between two electrodes, we reach, in this paper, an open-circuit voltage of up to 6.44 V for a single device, and thus crossing the 5 V limit that is required to power up several low-power consuming devices. Furthermore, by conducting drift-diffusion-based device modeling of the multifold devices, considering also the optical absorption profile in the stacked tandem cell and the effective exciton diffusion lengths, we demonstrate that effective current matching can be obtained in the devices through thickness optimization for each single cell. As a result, we demonstrate that the efficiency of these novel devices can be improved from 3.1% to 4.4% (best performing devices) in the case of a fivefold device structure, mainly due to the strong increase in the short-circuit current density, and thus lead to efficient small molecule-based solar cells high open-circuit voltages.

AB - In this paper, we demonstrate a novel method for achieving high open-circuit voltages (Voc) in organic solar cells based on tetraphenyldibenzoperiflanthen (DBP) as donor and fullerene (C70) as acceptor molecules, by fabrication of multifold bilayer single cells stacked on top of each other. As devices based on the material combination of DBP and C70 show relatively high open-circuit voltages of 0.87 V for single junction cells, and as both materials show broad absorption in the visible region pronounced peaks, they become ideal candidates as active layer materials in tandem stacked solar cells. By using a ten-fold bilayer structure of DBP and C70, sandwiched between two electrodes, we reach, in this paper, an open-circuit voltage of up to 6.44 V for a single device, and thus crossing the 5 V limit that is required to power up several low-power consuming devices. Furthermore, by conducting drift-diffusion-based device modeling of the multifold devices, considering also the optical absorption profile in the stacked tandem cell and the effective exciton diffusion lengths, we demonstrate that effective current matching can be obtained in the devices through thickness optimization for each single cell. As a result, we demonstrate that the efficiency of these novel devices can be improved from 3.1% to 4.4% (best performing devices) in the case of a fivefold device structure, mainly due to the strong increase in the short-circuit current density, and thus lead to efficient small molecule-based solar cells high open-circuit voltages.

KW - Organic semiconductors

KW - Photovoltaic cells

KW - Photovoltaic systems

KW - Solar energy

U2 - 10.1109/JPHOTOV.2017.2713405

DO - 10.1109/JPHOTOV.2017.2713405

M3 - Journal article

VL - 7

SP - 1319

EP - 1323

JO - IEEE Journal of Photovoltaics

JF - IEEE Journal of Photovoltaics

SN - 2156-3381

IS - 2

ER -