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| Author(s): |
Saionara Vilhegas Costa
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Campinas, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Instituto de Química |
| Defense date: | 2016-09-16 |
| Examining board members: |
Ana Flávia Nogueira;
Carlos Frederico de Oliveira Graeff;
Maria do Carmo Gonçalves;
Lucimara Stolz Roman;
Juliano Alves Bonacin
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| Advisor: | Ana Flávia Nogueira |
| Abstract | |
The use of cellulose substrates in electronic devices has a number of advantages such as low cost, ease recycling, flexibility, lightweight and compatible with printing processes. In this context, the main objectives of this work were the use of paper and others cellulosic substrates in the growth of zinc oxide (micro and nanostructures) for electrodes in third generation solar cells. The first part of this study involved the characterization of different kinds of papers, commercially available, and bacterial cellulose aiming their use as substrate. Subsequently, it was performed the growth of ZnO micro and nanostructures by hydrothermal synthesis and chemical bath deposition. In each type of cellulosic substrate it was investigated the best method for the deposition of homogeneous nucleation layer that favor the subsequent growth of ZnO micro and nanostructures. Then, we also investigated the best method for growing ZnO film for each type of cellulosic substrate. In the second part, micro- and nanostructures were grown by chemical bath deposition of ZnO on the aluminum recyclable paper and these were used as photo-electrodes in dye-sensitized solar cells DSSC. In the third one, cellulosic substrates were synthesized from aqueous solutions: nanocrystals (NCC) and nanofibers cellulose (NFC). The nanocellulose substrates with a partially transparent silver film were used as photo-electrodes in inverted organic solar cells in the following configuration: nanocellulose/Ag/ZnO:Al /PFDTBTP:PC70BM/MoO3/Ag. The NCC and NFC substrates were compared based on how their structural characteristics influenced their use in the inverted cells. The NCC films showed better results in the cells, with a conversion efficiency of around 1-1.5% for films with lower surface roughness, better spreading of the crystals over the film, crystallinity and uniformity, according to the results from AFM, FEG-SEM and XRD techniques. Furthermore, the addition of a polyethyleneimine film allowed greater reproducibility of these cells, once it served as an electron transport layer (ETL) (AU) | |
| FAPESP's process: | 12/12133-2 - Solar Cells from ZnO Nanostructures grown on paper substrate. |
| Grantee: | Saionara Vilhegas Costa |
| Support Opportunities: | Scholarships in Brazil - Doctorate |