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Solution-processed hydrogen molybdenum bronzes as highly conductive anode interlayers in efficient organic photovoltaics

Solution-processed hydrogen molybdenum bronzes as highly conductive anode interlayers in efficient organic photovoltaics
Solution-processed hydrogen molybdenum bronzes as highly conductive anode interlayers in efficient organic photovoltaics

Highly efficient and stable organic photovoltaic (OPV) cells are demonstrated by incorporating solution-processed hydrogen molybdenum bronzes as anode interlayers. The bronzes are synthesized using a sol-gel method with the critical step being the partial oxide reduction/hydrogenation using an alcohol-based solvent. Their composition, stoichiometry, and electronic properties strongly correlate with the annealing process to which the films are subjected after spin coating. Hydrogen molybdenum bronzes with moderate degree of reduction are found to be highly advantageous when used as anode interlayers in OPVs, as they maintain a high work function similar to the fully stoichiometric metal oxide, whereas they exhibit a high density of occupied gap states, which are beneficial for charge transport. Enhanced short-circuit current, open-circuit voltage and, fill factor, relative to reference devices incorporating either PEDOT-PSS or a solution processed stoichiometric molybdenum oxide, are obtained for a variety of bulk heterojunction mixtures based on different polymeric donors and fullerene acceptors. In particular, high power conversion efficiencies are obtained in devices that employed the s-H xMoO2.75 as the hole extraction layer. The incorporation of solution-processed hydrogen molybdenum bronzes as anode interlayers in organic photovoltaic cells is presented. High power conversion efficiencies are observed in devices based on polymeric donors and fullerene acceptors that include a bronze with a moderate degree of reduction, namely the s-H xMoO2.75, as the anode interlayer.

anode interlayers, hydrogen molybdenum bronzes, metal oxides, organic photovoltaics, solution processing
1614-6832
1-10
Soultati, Anastasia
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Douvas, Antonios M.
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Georgiadou, Dimitra G.
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Palilis, Leonidas C.
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Bein, Thomas
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Feckl, Johann M.
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Gardelis, Spyros
e1c19249-ca1b-44c3-bb48-3cf76362f388
Fakis, Mihalis
ed01170e-ba9c-48d8-87d3-02a05ad0eff0
Kennou, Stella
7ca6a6bd-6a05-4110-b3da-c8807f798370
Falaras, Polycarpos
ee9b644c-895d-49a7-8327-aa32aba63fcb
Stergiopoulos, Thomas
f00291bb-5ff8-4b4e-a391-3acce0303f78
Stathopoulos, Nikolaos A.
83a4653f-c4c8-464a-8ed1-a93c52cf3833
Davazoglou, Dimitris
a946cf5d-287a-4734-ba55-b180ab4525ed
Argitis, Panagiotis
ab9c4ea6-3dd2-4e34-935d-81bfb360f358
Vasilopoulou, Maria
aad1381e-d091-4090-8c7c-b74bed22393d
Soultati, Anastasia
75205fde-50fc-473e-ad72-ab0b3c6b2cb9
Douvas, Antonios M.
2e088659-e1b3-4723-aff9-4dfe385579b5
Georgiadou, Dimitra G.
84977176-3678-4fb3-a3dd-2044a49c853b
Palilis, Leonidas C.
b09e9554-54da-4be5-aa08-bda894e2b86f
Bein, Thomas
90cb2c47-9fa6-463e-9a86-40503461ecc2
Feckl, Johann M.
5d4292cb-010e-4ba3-bb53-ab240f23bd74
Gardelis, Spyros
e1c19249-ca1b-44c3-bb48-3cf76362f388
Fakis, Mihalis
ed01170e-ba9c-48d8-87d3-02a05ad0eff0
Kennou, Stella
7ca6a6bd-6a05-4110-b3da-c8807f798370
Falaras, Polycarpos
ee9b644c-895d-49a7-8327-aa32aba63fcb
Stergiopoulos, Thomas
f00291bb-5ff8-4b4e-a391-3acce0303f78
Stathopoulos, Nikolaos A.
83a4653f-c4c8-464a-8ed1-a93c52cf3833
Davazoglou, Dimitris
a946cf5d-287a-4734-ba55-b180ab4525ed
Argitis, Panagiotis
ab9c4ea6-3dd2-4e34-935d-81bfb360f358
Vasilopoulou, Maria
aad1381e-d091-4090-8c7c-b74bed22393d

Soultati, Anastasia, Douvas, Antonios M., Georgiadou, Dimitra G., Palilis, Leonidas C., Bein, Thomas, Feckl, Johann M., Gardelis, Spyros, Fakis, Mihalis, Kennou, Stella, Falaras, Polycarpos, Stergiopoulos, Thomas, Stathopoulos, Nikolaos A., Davazoglou, Dimitris, Argitis, Panagiotis and Vasilopoulou, Maria (2014) Solution-processed hydrogen molybdenum bronzes as highly conductive anode interlayers in efficient organic photovoltaics. Advanced Energy Materials, 4 (3), 1-10, [1300896]. (doi:10.1002/aenm.201300896).

Record type: Article

Abstract

Highly efficient and stable organic photovoltaic (OPV) cells are demonstrated by incorporating solution-processed hydrogen molybdenum bronzes as anode interlayers. The bronzes are synthesized using a sol-gel method with the critical step being the partial oxide reduction/hydrogenation using an alcohol-based solvent. Their composition, stoichiometry, and electronic properties strongly correlate with the annealing process to which the films are subjected after spin coating. Hydrogen molybdenum bronzes with moderate degree of reduction are found to be highly advantageous when used as anode interlayers in OPVs, as they maintain a high work function similar to the fully stoichiometric metal oxide, whereas they exhibit a high density of occupied gap states, which are beneficial for charge transport. Enhanced short-circuit current, open-circuit voltage and, fill factor, relative to reference devices incorporating either PEDOT-PSS or a solution processed stoichiometric molybdenum oxide, are obtained for a variety of bulk heterojunction mixtures based on different polymeric donors and fullerene acceptors. In particular, high power conversion efficiencies are obtained in devices that employed the s-H xMoO2.75 as the hole extraction layer. The incorporation of solution-processed hydrogen molybdenum bronzes as anode interlayers in organic photovoltaic cells is presented. High power conversion efficiencies are observed in devices based on polymeric donors and fullerene acceptors that include a bronze with a moderate degree of reduction, namely the s-H xMoO2.75, as the anode interlayer.

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e-pub ahead of print date: 2 October 2013
Published date: 18 February 2014
Keywords: anode interlayers, hydrogen molybdenum bronzes, metal oxides, organic photovoltaics, solution processing

Identifiers

Local EPrints ID: 440520
URI: http://eprints.soton.ac.uk/id/eprint/440520
ISSN: 1614-6832
PURE UUID: 9ab26014-dfa7-49d4-98a7-1c1d1cd4cfa3
ORCID for Dimitra G. Georgiadou: ORCID iD orcid.org/0000-0002-2620-3346

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Date deposited: 06 May 2020 16:31
Last modified: 07 Oct 2020 02:27

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Contributors

Author: Anastasia Soultati
Author: Antonios M. Douvas
Author: Leonidas C. Palilis
Author: Thomas Bein
Author: Johann M. Feckl
Author: Spyros Gardelis
Author: Mihalis Fakis
Author: Stella Kennou
Author: Polycarpos Falaras
Author: Thomas Stergiopoulos
Author: Nikolaos A. Stathopoulos
Author: Dimitris Davazoglou
Author: Panagiotis Argitis
Author: Maria Vasilopoulou

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