Graphene with Ni-Grid as Semitransparent Electrode for Bulk Heterojunction Solar Cells (BHJ-SCs)

In this work, we present the fabrication and characterization of bulk-heterojunction solar cells on monolayer graphene (MLG) with nickel-grids (Ni-grid) as semitransparent conductive electrode. The electrodes showed a maximum transmittance of 90% (calculated in 300-800 nm range) and a sheet resistan...

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Published inPolymers Vol. 14; no. 5; p. 1046
Main Authors Dianetti, Martina, Susanna, Gianpaolo, Calabrò, Emanuele, Polino, Giuseppina, Otto, Martin, Neumaier, Daniel, Reale, Andrea, Brunetti, Francesca
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 05.03.2022
MDPI
Subjects
bulk-heterojunction solar cells
Carbon
Chemical vapor deposition
chemical vapour deposition (CVD)
Configurations
Electrical resistivity
Electrodes
Energy conversion efficiency
Glass substrates
Graphene
graphene based solar cells
Heterojunctions
low band-gap
Ni-grid/MLG
Optoelectronic devices
Photovoltaic cells
Silver
Solar cells
TCO-free solar cells
United States > US
Ni-grid/MLG
chemical vapour deposition (CVD)
graphene based solar cells
bulk-heterojunction solar cells
low band-gap
TCO-free solar cells
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Summary:In this work, we present the fabrication and characterization of bulk-heterojunction solar cells on monolayer graphene (MLG) with nickel-grids (Ni-grid) as semitransparent conductive electrode. The electrodes showed a maximum transmittance of 90% (calculated in 300-800 nm range) and a sheet resistance down to 35 Ω/□. On these new anodes, we fabricated TCO free BHJ-SCs using PTB7 blended with PC70BM fullerene derivative as active layer. The best device exhibited a power conversion efficiency (PCE) of 4.2% in direct configuration and 3.6% in inverted configuration. The reference solar cell, realized on the ITO glass substrate, achieved a PCE of 6.1% and 6.7% in direct and inverted configuration respectively; for comparison we also tested OSCs only with simple Ni-grid as semitransparent and conductive electrode, obtaining a low PCE of 0.7%. The proposed approach to realize graphene-based electrodes could be a possible route to reduce the overall impact of the sheet resistance of this type of electrodes allowing their use in several optoelectronic devices.
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ISSN:2073-4360
2073-4360
DOI:10.3390/polym14051046