Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
In order for perovskite solar cells (PSCs) to achieve their maximum efficiency it is necessary to clearly understand the key loss processes that govern their performance. In particular, understanding the origin of the open-circuit voltage (VOC) is vital. In PSCs, the VOC can shift considerably depending on the choice of transport layer and device architecture, be it from improved perovskite film quality or a better interface between the perovskite absorber and transport layer. To probe the recombination dynamics, transient optoelectronic techniques, such as transient photovoltage, transient photocurrent and charge extraction, offer key insights into the non-geminate charge carrier dynamics in solar cells and can explain the difference in VOC between different devices. These techniques have been employed with great success in organic and dye-sensitized solar cells. However, in PSCs the application of these techniques is non-trivial. In this talk I will present some of our recent studies on PSCs using transient optoelectronic techniques and highlight some the challenges we have faced in interpreting the data.