Publicação
Silicon thin film solar cells on paper-based substrates with applications in optoelectronic biodevices
| datacite.subject.fos | Engenharia e Tecnologia::Outras Engenharias e Tecnologias | pt_PT |
| dc.contributor.advisor | Martins, Rodrigo | |
| dc.contributor.advisor | Águas, Hugo | |
| dc.contributor.author | Vicente, António Miguel Teixeira | |
| dc.date.accessioned | 2018-01-16T16:35:50Z | |
| dc.date.available | 2018-01-16T16:35:50Z | |
| dc.date.issued | 2017-10 | |
| dc.date.submitted | 2017 | |
| dc.description.abstract | As the effects of climate change continue to exacerbate, it is crucial to shift to renewable energies as our primary energy sources. Benefits go beyond curbing greenhouse gases emissions and have, for instance, positive impacts on human lives in terms of health, social stability, and energy security of countries. The present thesis explores silicon thin film solar cells (TFSC) as one possible answer to the increasing energy demand, particularly to be applied in the emerging and fast-growing field of paper-based devices, to power autonomous optoelectronic biosensors. Such devices tend to be recyclable, flexible, lightweight, and low-cost. For such applications to become a reality, this thesis explores optimization methodologies for key fabrication steps of silicon TFSCs to achieve a sustainable and energy efficient process, with reduced resource consumption, and compatible with temperature-sensitive paper-based substrates: Experimental design and statistical analysis were combined to develop a methodology to explore in a multidimensional fashion the interactions between fabrication parameters and experimental outputs. This optimization step of the layer structure of TFSC was performed on glass and lead to a device with a power conversion efficiency of 5.2%, FF ≈ 66%, JSC = 9 mA·cm-2, and VOC = 0.88 V. Transparent conductive oxides (TCOs) based on doped zinc oxides materials (AZO, AZO:H, GZO:H and ZnO:H) were optimized by post-deposition annealing methods. Results show that these materials, with resistivity < 4 × 10-4 Ω.cm, a high transmittance > 85%, can be cost-effective and sustainable alternatives to the industrial standard ITO. The combination of optimization processes led to a first-time report of the viability of fabricating silicon TFSC on paper-based substrates, by PECVD, with a power conversion efficiency of ~4.1%, FF ≈ 54%, JSC = 9.05 mA·cm-2, and VOC = 0.84 V. The power density of an envisioned PV module at the current technology stage is in line with the power requirements of paper-based optoelectronic devices under development. Amid the possibilities, silicon TFSC can power point-of-care tests and contribute to a more responsive care through immediate diagnosis and subsequent clinical/therapeutic decision-making. | pt_PT |
| dc.identifier.tid | 101307535 | |
| dc.identifier.uri | http://hdl.handle.net/10362/28330 | |
| dc.language.iso | eng | pt_PT |
| dc.relation | MIT-Portugal (SFRH/BD/33978/2009) | pt_PT |
| dc.subject | silicon solar cells | pt_PT |
| dc.subject | paper-based substrates | pt_PT |
| dc.subject | transparent conductive oxides | pt_PT |
| dc.subject | optimization | pt_PT |
| dc.subject | PECVD | pt_PT |
| dc.subject | optoelectronics | pt_PT |
| dc.title | Silicon thin film solar cells on paper-based substrates with applications in optoelectronic biodevices | pt_PT |
| dc.type | doctoral thesis | |
| dspace.entity.type | Publication | |
| rcaap.rights | openAccess | pt_PT |
| rcaap.type | doctoralThesis | pt_PT |
| thesis.degree.name | Doutor em Bioengenharia | pt_PT |