INMA Junior: Raquel Royo & Míriam Abad
Seminario INMA Junior: Raquel Royo y Míriam Abad
Next Wednesday, June 7, at 12:00 pm, will be held the next INMA Junior Seminar in the Sala de Grados, Building A, Faculty of Sciences, Campus San Francisco.
After the seminar, there will be a snack to which all attendees may attend.
Speaker 1: Raquel Royo
Title: PHOTOACTIVE π-FUNCTIONAL ORGANIC MOLECULES IN PHOTOVOLTAIC APPLICATIONS
Summary: π−conjugated systems attract great interest due to the large scope of their properties, useful for a wide range of applications. In particular, the optical and electronic properties of π-bridged compounds have fostered their study and integration into optoelectronic and electronic devices. Third-generation photovoltaics are able to produce high efficiency photon to electricity conversion devices at a cheaper and more suitable way in comparison with silicon devices. In this seminar, I will focus on the design and synthesis of D-p-A (donor- p -acceptor) organic dyes as photoactive component in dye-sensitized solar cells (DSSCs). The photovoltaic behavior of three series of dyes based on a 4H-piranilidene donor have been studied, paying attention to the influence of the chemical structure on the efficiency.
Moreover, I will present a novel spiro-type molecule as a hole transport material (HTM). We investigated the Spiro-HTM effects on the performance of inverted PSCs (iPSCs) based on triple cation CsFAMA perovskite. This HTM compound allows the formation of very thin layers (<15 nm) which promotes hole mobility without the need for doping. In comparison with the PEDOT: PSS reference devices, the iPSC based on Spiro-HTM exhibit a higher VOC leading to a higher PCE.
Speaker 2: Miriam Abad
Title: AQUEOUS SEEDED RAFT POLYMERIZATION FOR THE PREPARATION OF SELF-ASSEMBLIES CONTAINING NUCLEOBASE ANALOGUES
Summary: Amphiphilic block copolymers can self-assemble in water leading to different structures with sizes at the nanoscale and potential uses in different fields, including the biomedical one. The majority of self-assembly methodologies are post-polymerization processes which consist of time-consuming multiple steps and provide highly diluted block copolymer dispersions. Over the past years, polymerization-induced self-assembly (PISA) has emerged as an attractive one-step alternative where self-assembly occurs during the polymerization, thus avoiding multiple processing or purification steps and also providing highly concentrated self-assembly dispersions with good colloidal stability. In this work, self-assemblies containing the nucleobase analogue 2,6-diacylaminopyridine (DAP) have been successfully prepared for the first time by aqueous seeded RAFT polymerization in high concentrations. For this purpose, a diblock copolymer containing poly(ethylene glycol) (PEG) and DAP polymethacrylate blocks was used as a macro-chain-transfer agent (PEG124–b-PDAP9-CTA) for the polymerization of 2-hydroxypropyl methacrylate (HPMA) in water. From the systematic variation of the degree of polymerization and solid concentration, a phase diagram has been generated that correlates both variables with the morphologies of this new system. Self-assemblies have been characterized by TEM and DLS, observing morphologies from low to high order (from spherical micelles to worms and to vesicles). In addition, H-bonding supramolecular functionalization of the DAP repeating units during aqueous seeded RAFT polymerization has been examined by functionalization with a cross-linker with four thymine groups. Finally, the loading and the subsequent release of Nile Red have been proven in both supramolecular cross-linked and non-cross-linked self-assemblies.
Certificates of attendance will be sent to the cycle of INMA Junior Seminars for attendance at least two of the sessions of the cycle. We ask those interested to send an email to any of the organisers:
Beatriz Zornoza (bzornoza@unizar.es)
Gabriel Alfranca (alfrancagabriel@gmail.com)
Zsuzsa Baranyai (zsuzsabaranyai@unizar.es)
Cristina Momblona (cristinamomblona@unizar.es)
Marta Haro (mharo@unizar.es)
Alberto Concellón (aconcellon@unizar.es)
Jorge Pérez (jorgepb@unizar.es)
