Organic semiconductors have a large potential in low-cost and large-area device applications, benefiting from cheap manufacturing processes such as solution-based roll-to-roll printing.
All device applications previously dominated by inorganic semiconductors have presented opportunities for their organic counterparts. Such applications include solar cells, LEDs, field-effect transistors, lasers, and memory devices.
Metal halide perovskites
Metal halide perovskites have emerged as one of the most popular semiconducting materials since 2009. They have shown unique properties, including:
• Tunable bandgap
• High absorption coefficient
• Broad absorption spectrum
• High charge carrier mobility
• Long charge diffusion lengths
These properties enable metal halide perovskites to be used in a broad range of photovoltaics and other optoelectronic applications.
Lead free perovskites /Lead free metal halides
The state-of-the-art perovskites used in optoelectronics contain toxic lead (Pb). Focus is therefore set on creating lead free perovskites or perovskite alike materials with as good properties as the lead containing. Lead can for example be exchanged to cupper (Cu), Iron (Fe), Manganese (Mn), and many other metals. Some of the ways of changing the properties of an optoelectronic material is modify the material composition, use additives or by changing the structural or the particle dimensionality.
The electron and hole transport layers are crucial for a device to work efficient and plays an important role in the degradation of the device. The group is using a large variety of transport materials, but an extra focus is set on improving a hole transport material group called spiro materials.