From inorganic to organic semiconductors and the emergence of hybrid organic-inorganic perovskites


Dr Ardalan Armin, UQ (Centre for Organic Photonics and Electronics)
Frank White (43), Rm 102, 3 pm

Inorganic semiconductors are the engines of modern electronics and optoelectronics. We have been living in the so-called silicon-age for nearly 50 years. Inorganic semiconductors are typically robust and stable, and have high charge carrier mobility, a parameter which quantifies how quickly free charges can move through a conducting material. In the last two decades, a newer class of semiconductors has emerged: disordered semiconductors including organic small molecules, dendrimers, oligomers, polymers and more recently organo-halide perovskites. Although exhibiting low charge carrier mobility, they are thought to be potentially advantageous to their inorganic counterparts in some aspects and applications. Disordered semiconductors are often solution processable, and therefore suitable for low cost electronic device fabrication, and are available with wide absorption spectral ranges from the ultra-violet (UV) to the near infrared (NIR). They can also be optimized for high luminescence efficiency for applications such as organic light emitting diodes (OLEDs) and lasers. In this presentation I will talk about charge transport and optical properties of photovoltaic-based light sensitive organic/perovskite diodes including solar cells and photodiodes. Understanding how electrical and optical physics comes together in thin disorder semiconductor devices leads to significant advances in optoelectronic technology.