Nanostructured oxides and Re(I) complexes for optoelectronic devices

Author(s)

Lais Sottili de Matos

• Document type: Doctoral Thesis
• Press: São Paulo.
• Institution: Universidade de São Paulo (USP). Conjunto das Químicas (IQ e FCF) (CQ/DBDCQ)
• Defense date: 2020-08-07

Examining board members

Neyde Yukie Murakami Iha; Josef Wilhelm Baader; Alzir Azevedo Batista; Melina Kayoko Itokazu Hara

• Advisor: Neyde Yukie Murakami Iha

Abstract

In this thesis, compact layers were employed to increase the performance of dye-sensitized solar cells (DSCs), as well as the photochemical and photophysical properties of Re(I) complexes were investigated toward application in optoelectronic devices. The TiO2/ZnO thin film was judiciously engineered as compact layers for photoanodes in DSCs, resulting in a significant improvement (up to 67%) of the DSC energy conversion leading to efficient devices. In parallel, fac-[Re(CO)3(R2phen)(trans-stpyCOOMe)]+ complexes were obtained, R2phen = 1.10-phenanthroline 4,7-disubstituted and trans-stpyCOOMe = trans-4-(2-(4-pyridinyl)vinyl)methylbenzoate, which presents trans→cis and cis→trans reversible photoisomerization. cis species are emissive and can be exploited in photosensors and photoswitches. The novel fac-[Re(CO)3(dcbH2)(trans-L)]+ complexes, dcbH2 = 4,4\'-dicarboxy-2,2\'-bipyridine and trans-L = trans-4-styrylpyridine (trans-stpy) or trans-1,2-bis (4-pyridyl)ethylene (trans-bpe), were strategically designed to show visible trans→cis photoisomerization under 436 nm irradiation for the first time, allowing application in energy conversion. In particular, the fac- [Re(CO)3(dcbH2)(trans-stpy)]+ complex also exhibited trans→cis photoreaction when adsorbed on the TiO2 surface, presenting good prospects in applications. (AU)

• FAPESP's process: 14/19637-1 - Nanomaterials and thin films for application in optoelectronic devices
• Grantee: Lais Sottili de Matos
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)