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Research Fellows Directory

Lazaro Padilha

Dr Lazaro Padilha

Research Fellow


University of Oxford

Research summary

Quantum dots are tiny pieces of semiconductors with nanometric scale, for comparison, each quantum dot is about 10,000 times smaller than the thickness of a human hair. Due to the low dimensionality, it is possible to control how the material interacts with light and how the electrons behaves inside the material upon the interaction with light. In this project we have been studying how to take advantage of the unique properties from those nanomaterials and use them as the base for new generation solar cells, a technology that could supply clean and renewable energy for homes and business all around the globe. In this work, we have demonstrated that by using carbon nanotube, a different type of nanomaterial, as an intermediate layer in between the quantum dots (light absorbing layer) and the gold contact (which captures the charge to generate the electrical power), can enhance the device efficiency by nearly a factor of two, achieving more than 6%. Using advanced spectroscopy studies, we could understand that the extra carbon nanotube layer nearly doubles the charge extraction rate, explaining what had been observed on the devices. These finds shine some light towards the development on novel photovoltaic technologies and pave the way to high efficiency devices.

Grants awarded

Infrared Colloidal Quantum Dots for High Efficiency Photovoltaics

Scheme: Newton Advanced Fellowship

Dates: Oct 2015 - Sep 2018

Value: £74,000

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