Towards organic multi-junction RAINBOW solar cells

Date: Thursday, 24 October 2024

Time: 10AM

Venue: Institut de Ciència de Materials de Barcelona (ICMAB, CSIC) - Sala d'Actes Carles Miravitlles

Abstract

Organic photovoltaics (OPV) is a promising green energy technology due to its lightweight, optical tunability, flexibility, and compatibility with industrial roll-to-roll fabrication. However, improvements are necessary for stability and efficiency, particularly for multi-junction OPVs based on tandem geometries. In this PhD thesis, we explore a novel multi-junction approach called RAINBOW. This geometry involves stacking sub-cells laterally instead of vertically to address processing challenges and eliminate the need for current matching. The research aimed to develop a toolkit for optimizing parameters to increase the maximum efficiency of RAINBOW and validate the RAINBOW concept. To characterize and study RAINBOW solar cells, we have developed a spectrum on demand light source (SOLS) setup and a simulation model. Proof of concept devices were fabricated to demonstrate the effectiveness of the RAINBOW concept. Additionally, through a screening of wide band-gap materials, the PTQ10:O-IDFBR blend was identified as having the potential to enhance multi-junction performance and indoor light harvesting. This finding underscores the practical implications of our research and its potential to contribute to the broader field of renewable energy.

Supervisors

Mariano Campoy

Alejandro Goñi

PhD comitee

President: Prof. Marta Mas, ICMAB, Spain

Secretary: Prof. Hernán Ruy Míguez García, Institute of Material Science of Seville (ICMS), Spain

Vocal: Prof. Christoph J. Brabec, Friedrich Alexander Universität Erlangen Nürnberg, Germany

University: Universitat Autònoma de Barcelona (UAB)

PhD Programme: Material Science