Crystalline molybdenum oxide layers as efficient and stable hole contacts in organic photovoltaic devices

Mehrad Ahmadpour, A. L. F. Cauduro, C. Méthivier, B. Kunert, C. Labanti, R. Resel, Vida Engmann, Horst-Günter Rubahn, N. Witkowski, A. K. Schmid, Morten Madsen

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Resumé

High work function metal oxides such as molybdenum oxide (MoOx) have demonstrated good hole contact properties in organic photovoltaic (OPV) devices in the past years and have replaced the otherwise conventionally used PEDOT:PSS. In this work, we introduce new crystalline MoOx layers that outperform the otherwise commonly used thermally grown MoOx layers in OPV devices. These hole contact layers are developed from superoxidized MoO3.2 films grown by reactive sputtering, followed by postannealing in high vacuum to induce crystallization of the otherwise amorphous MoOx films. Standard configuration organic solar cell devices based on DBP as electron donor and C70 as electron acceptor were developed on top of the sputtered MoOx, and a large increase in power conversion efficiency as a function of the MoOx annealing temperature was observed, which is in clear contrast to devices grown on thermally deposited MoOx. The crystallization of the sputtered MoOx at elevated temperatures is shown to lead to high work function films with improved conductivity, resulting in the appealing device properties. Importantly, long-term stability investigations revealed that devices based on these crystalline MoOx films exhibit superior stability as compared to devices based on thermally grown MoOx. These characteristics show that crystalline MoOx prepared by postannealing sputter deposited films forms a superior hole contact layer material for future air-stable organic optoelectronic devices.
OriginalsprogEngelsk
TidsskriftACS Applied Energy Materials
Vol/bind2
Udgave nummer1
Sider (fra-til)420-427
ISSN2574-0962
DOI
StatusUdgivet - 20. jan. 2019

Fingeraftryk

molybdenum oxides
oxide films
crystallization
high vacuum
optoelectronic devices
metal oxides
electrons
solar cells
sputtering

Citer dette

Ahmadpour, Mehrad ; Cauduro, A. L. F. ; Méthivier, C. ; Kunert, B. ; Labanti, C. ; Resel, R. ; Engmann, Vida ; Rubahn, Horst-Günter ; Witkowski, N. ; Schmid, A. K. ; Madsen, Morten. / Crystalline molybdenum oxide layers as efficient and stable hole contacts in organic photovoltaic devices. I: ACS Applied Energy Materials. 2019 ; Bind 2, Nr. 1. s. 420-427.
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abstract = "High work function metal oxides such as molybdenum oxide (MoOx) have demonstrated good hole contact properties in organic photovoltaic (OPV) devices in the past years and have replaced the otherwise conventionally used PEDOT:PSS. In this work, we introduce new crystalline MoOx layers that outperform the otherwise commonly used thermally grown MoOx layers in OPV devices. These hole contact layers are developed from superoxidized MoO3.2 films grown by reactive sputtering, followed by postannealing in high vacuum to induce crystallization of the otherwise amorphous MoOx films. Standard configuration organic solar cell devices based on DBP as electron donor and C70 as electron acceptor were developed on top of the sputtered MoOx, and a large increase in power conversion efficiency as a function of the MoOx annealing temperature was observed, which is in clear contrast to devices grown on thermally deposited MoOx. The crystallization of the sputtered MoOx at elevated temperatures is shown to lead to high work function films with improved conductivity, resulting in the appealing device properties. Importantly, long-term stability investigations revealed that devices based on these crystalline MoOx films exhibit superior stability as compared to devices based on thermally grown MoOx. These characteristics show that crystalline MoOx prepared by postannealing sputter deposited films forms a superior hole contact layer material for future air-stable organic optoelectronic devices.",
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Crystalline molybdenum oxide layers as efficient and stable hole contacts in organic photovoltaic devices. / Ahmadpour, Mehrad; Cauduro, A. L. F.; Méthivier, C.; Kunert, B. ; Labanti, C.; Resel, R.; Engmann, Vida; Rubahn, Horst-Günter; Witkowski, N. ; Schmid, A. K. ; Madsen, Morten.

I: ACS Applied Energy Materials, Bind 2, Nr. 1, 20.01.2019, s. 420-427.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Crystalline molybdenum oxide layers as efficient and stable hole contacts in organic photovoltaic devices

AU - Ahmadpour, Mehrad

AU - Cauduro, A. L. F.

AU - Méthivier, C.

AU - Kunert, B.

AU - Labanti, C.

AU - Resel, R.

AU - Engmann, Vida

AU - Rubahn, Horst-Günter

AU - Witkowski, N.

AU - Schmid, A. K.

AU - Madsen, Morten

PY - 2019/1/20

Y1 - 2019/1/20

N2 - High work function metal oxides such as molybdenum oxide (MoOx) have demonstrated good hole contact properties in organic photovoltaic (OPV) devices in the past years and have replaced the otherwise conventionally used PEDOT:PSS. In this work, we introduce new crystalline MoOx layers that outperform the otherwise commonly used thermally grown MoOx layers in OPV devices. These hole contact layers are developed from superoxidized MoO3.2 films grown by reactive sputtering, followed by postannealing in high vacuum to induce crystallization of the otherwise amorphous MoOx films. Standard configuration organic solar cell devices based on DBP as electron donor and C70 as electron acceptor were developed on top of the sputtered MoOx, and a large increase in power conversion efficiency as a function of the MoOx annealing temperature was observed, which is in clear contrast to devices grown on thermally deposited MoOx. The crystallization of the sputtered MoOx at elevated temperatures is shown to lead to high work function films with improved conductivity, resulting in the appealing device properties. Importantly, long-term stability investigations revealed that devices based on these crystalline MoOx films exhibit superior stability as compared to devices based on thermally grown MoOx. These characteristics show that crystalline MoOx prepared by postannealing sputter deposited films forms a superior hole contact layer material for future air-stable organic optoelectronic devices.

AB - High work function metal oxides such as molybdenum oxide (MoOx) have demonstrated good hole contact properties in organic photovoltaic (OPV) devices in the past years and have replaced the otherwise conventionally used PEDOT:PSS. In this work, we introduce new crystalline MoOx layers that outperform the otherwise commonly used thermally grown MoOx layers in OPV devices. These hole contact layers are developed from superoxidized MoO3.2 films grown by reactive sputtering, followed by postannealing in high vacuum to induce crystallization of the otherwise amorphous MoOx films. Standard configuration organic solar cell devices based on DBP as electron donor and C70 as electron acceptor were developed on top of the sputtered MoOx, and a large increase in power conversion efficiency as a function of the MoOx annealing temperature was observed, which is in clear contrast to devices grown on thermally deposited MoOx. The crystallization of the sputtered MoOx at elevated temperatures is shown to lead to high work function films with improved conductivity, resulting in the appealing device properties. Importantly, long-term stability investigations revealed that devices based on these crystalline MoOx films exhibit superior stability as compared to devices based on thermally grown MoOx. These characteristics show that crystalline MoOx prepared by postannealing sputter deposited films forms a superior hole contact layer material for future air-stable organic optoelectronic devices.

U2 - 10.1021/acsaem.8b01452

DO - 10.1021/acsaem.8b01452

M3 - Journal article

VL - 2

SP - 420

EP - 427

JO - ACS Applied Energy Materials

JF - ACS Applied Energy Materials

SN - 2574-0962

IS - 1

ER -