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Alfonsina A. A. Torimtubun


PhD Programme

Technologies for Nanosystems, Bioengineering and Energy

Research group

Nanoelectronic and Photonic Systems

Supervisors

Lluís Marsal Garví & Josep Pallarès Marzal

Bio

Alfonsina obtained her bachelor in Department of Chemical Engineering at University of Brawijaya, Indonesia (2011 to 2015), then she earned a scholarship to continue her Master degree in Department of Chemical and Materials Engineering at National Central University (2015-2017). During her MSc, she worked in the research project which is directed toward understanding the charge transport mechanism in the organic semiconductor at a molecular level, especially for the charge transport in n-type organic thin film transistor (OTFTs). By collaborating with Department of Chemistry at National Central University, National Chiao Tung University, National Taiwan University and Northwestern University USA, they have successfully synthesized the new type of n-type organic semiconductor materials based small molecules with the highest electron mobility that can be achieved of up to 0.77 cm2/Vs. After her MSc, she worked as a lecturer in Chemical Engineering Department at Institut Teknologi Kalimantan, Indonesia. During her work as a lecturer, she have been involved in the green and sustainable perovskite solar cell research project and they won some research fundings based on this project. Nowadays, she is working as a PhD student at NePhos group to study the development of organic solar cells and she is part of the project in collaboration with the other university in Spain.

Project: Study and development of ternary system of organic solar cells based on non-fullerene small molecules acceptors

Conventional organic solar cells (OSCs) are typically based on blends of electron-donor materials and fullerene-based electron-acceptors materials in the bulk heterojunctions (BHJs) architecture device. In this work, they use phthalocyanines derivatives as a new non-fullerene (NF) small molecules materials and new electron transport layer material. The use of NF materials allow the NF-OSCs to achieve better absorption properties and better chemical and thermal stability compared to those fullerene-OSCs counterparts. Furthermore, they are also investigating the ternary system of OSCs to gain the insights into the materials selection, the mechanism of charge carrier mobility and charge recombination in the ternary system of organic solar cells (OSCs). Ternary organic solar cell is a promising method to improve the device performance OSCs by adding a third component into a binary system. In a ternary blend, the third components not only provide a broadened light harvesting and optimizing the film morphology, but also facilitating exciton dissociation and charge transport. As a consequence, it is improving the device performance of OSCs, i.e., the fill factor (FF), short-circuit current density (Jsc), open-circuit voltage (Voc) and power conversion efficiency (PCE).