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Dianetti M, Susanna G, Calabrò E, Polino G, Otto M, Neumaier D, Reale A, Brunetti F. Graphene with Ni-Grid as Semitransparent Electrode for Bulk Heterojunction Solar Cells (BHJ-SCs). Polymers (Basel) 2022; 14:polym14051046. [PMID: 35267869 PMCID: PMC8915009 DOI: 10.3390/polym14051046] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 02/22/2022] [Accepted: 02/25/2022] [Indexed: 12/10/2022] Open
Abstract
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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Affiliation(s)
- Martina Dianetti
- Department of Electronic Engineering, University of Rome Tor Vergata—CHOSE, Via del Politecnico 1, 00133 Rome, Italy; (M.D.); (G.S.); (E.C.); (G.P.); (A.R.)
| | - Gianpaolo Susanna
- Department of Electronic Engineering, University of Rome Tor Vergata—CHOSE, Via del Politecnico 1, 00133 Rome, Italy; (M.D.); (G.S.); (E.C.); (G.P.); (A.R.)
- ISCTI—Istituto Superiore delle Comunicazioni e delle Tecnologie dell’Informazione-Ministero dello Sviluppo Economico, Viale America 201, 00144 Rome, Italy
| | - Emanuele Calabrò
- Department of Electronic Engineering, University of Rome Tor Vergata—CHOSE, Via del Politecnico 1, 00133 Rome, Italy; (M.D.); (G.S.); (E.C.); (G.P.); (A.R.)
| | - Giuseppina Polino
- Department of Electronic Engineering, University of Rome Tor Vergata—CHOSE, Via del Politecnico 1, 00133 Rome, Italy; (M.D.); (G.S.); (E.C.); (G.P.); (A.R.)
| | - Martin Otto
- Gesellschaft für Angewandte Mikro-und Optoelektronic mBH—AMO GmBH, Otto-Blumenthal-Straße 25, 52074 Aachen, Germany; (M.O.); (D.N.)
| | - Daniel Neumaier
- Gesellschaft für Angewandte Mikro-und Optoelektronic mBH—AMO GmBH, Otto-Blumenthal-Straße 25, 52074 Aachen, Germany; (M.O.); (D.N.)
- Chair of Smart Sensor Systems, Bergische University of Wuppertal, 42119 Wuppertal, Germany
| | - Andrea Reale
- Department of Electronic Engineering, University of Rome Tor Vergata—CHOSE, Via del Politecnico 1, 00133 Rome, Italy; (M.D.); (G.S.); (E.C.); (G.P.); (A.R.)
| | - Francesca Brunetti
- Department of Electronic Engineering, University of Rome Tor Vergata—CHOSE, Via del Politecnico 1, 00133 Rome, Italy; (M.D.); (G.S.); (E.C.); (G.P.); (A.R.)
- Correspondence: ; Tel.: +39-06-7259-7366
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Lee J, Na HK, Lee S, Kim WK. Advanced graphene oxide-based paper sensor for colorimetric detection of miRNA. Mikrochim Acta 2021; 189:35. [PMID: 34940914 DOI: 10.1007/s00604-021-05140-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Accepted: 12/07/2021] [Indexed: 11/26/2022]
Abstract
MicroRNAs (miRNAs), found in blood and body fluids, have emerged as potential non-invasive biomarkers for disease and injury. miRNAs are quantitatively evaluated using typical RNA analysis methods such as the quantitative reverse transcription polymerase chain reaction, microarrays, and Northern blot, all of which require complex procedures and expensive reagents. To utilize miRNAs as practical biomarkers, it will be helpful to develop simple and user-friendly sensors. In this study, a paper-based miRNA sensor was developed by combining two methods: (1) target-recycled DNAzyme (Dz) amplification and (2) graphene oxide-assisted Dz blotting on paper. The Dz spots on paper caused a miRNA-dependent color change in presence of colorimetric reagents and facilitated the quantification of absolute amount of the target miRNA, irrespective of the volume, with high reproducibility. This approach is technologically straightforward and enables quantification of as low as 7.75 fmol miRNA using a portable smartphone.
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Affiliation(s)
- Jieon Lee
- Predictive Toxicology Department, Korea Institute of Toxicology (KIT), 141 Gajeong-ro, Yuseong-gu, Daejeon, 34114, Korea.
- Human and Environmental Toxicology, University of Science and Technology, Daejeon, 34113, Korea.
| | - Hee-Kyung Na
- Center for Nano-Bio Measurement, Korea Research Institute of Standards and Science (KRISS), Daejeon, 34113, Korea
| | - Sangwoo Lee
- Predictive Toxicology Department, Korea Institute of Toxicology (KIT), 141 Gajeong-ro, Yuseong-gu, Daejeon, 34114, Korea
| | - Woo-Keun Kim
- Predictive Toxicology Department, Korea Institute of Toxicology (KIT), 141 Gajeong-ro, Yuseong-gu, Daejeon, 34114, Korea
- Human and Environmental Toxicology, University of Science and Technology, Daejeon, 34113, Korea
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