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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 1: Tutorial: Modern Photovoltaics - Techniques beyond Silicon
CPP 1.4: Tutorium
Sonntag, 21. März 2010, 17:30–18:00, H2
Organic solar cells based on small molecules — •Moritz Riede — IAPP, Technische Universität Dresden, Germany
In recent years organic solar cells based on polymers or small molecules have received increasing attention from both science and industry, making it a very dynamic field of research. On the one hand, there are a number of open questions on the fundamental physics, e.g. the process of free charge carrier generation. On the other hand, there is the perspective of low cost solar power due to easy solar cell preparation, low-cost materials and processing technologies, and the possibility of producing large-area flexible devices on plastic substrates. Currently there are two main preparation technologies: solution processing and vacuum thermal deposition. This tutorial will focus on the main principles and concepts of the latter one. Despite its limitations to small molecules due to the thermal evaporation process, vacuum deposition has several distinct advantages: small molecules can be purified to a high degree, molecular doping of the organic layers is possible via co-evaporation, the layer thickness can be controlled well and stacked structures, e.g. for tandem solar cells, are easily accessible. Currently, metal-phthalocyanines and C60 are used as standard absorbers, but also new and promising materials have been introduced in recent years. Continuous material and device optimisation has lead to certified efficiencies of more than 6% on an device area exceeding 1cm2. Finally, an outlook on possible production routes is given.