Controlling Solution Chemistry towards Upscaling of Perovskite Photovoltaics
Kai Zhu a, joseph Berry a
a National Renewable Energy Laboratory, US, Denver West Parkway, 15013, Golden, United States
Materials for Sustainable Development Conference (MATSUS)
Proceedings of nanoGe September Meeting 2017 (NFM17)
SF2 Solution Processed Innovative Solar Cells
Barcelona, Spain, 2017 September 4th - 9th
Organizers: Emilio Palomares and Garry Rumbles
Invited Speaker, joseph Berry, presentation 058
Publication date: 20th June 2016

Organic-inorganic hybrid halide perovskites have recently emerged as a new class of light absorbers with a rapid progress and impressive efficiencies (>22%) for solar conversion applications. Despite the rapid progress demonstrated by these light absorbers, there is still a lack of understanding of some fundamental material/physical/chemical properties of these materials. There is also a significant processing gap between the lab-scale spin coating and scalable deposition methods toward future roll-to-roll manufacturing. The challenge results from the sensitivity of perovskite crystallization and film formation in different processing conditions. In this presentation, I will present our recent studies toward a better understanding and control of perovskite nucleation, grain growth, and microstructure evolution using solution processing. The precursor chemistry and growth conditions are found to affect significantly the structural and electro-optical properties of perovskite thin films. We also find that the precursor ink chemistry (solvent, coordination chemistry) of perovskite is critical for scalable deposition; but this has largely been underexplored. We present a rational design of perovskite precursor film formation to achieve highly specular films using scalable deposition methods. Using these high quality perovskite films, we have achieved device efficiencies approaching the values obtained on small scale by spin coating. These findings make a significant advance towards commercialization of the perovskite photovoltaic technology. Our recent progress towards stable perovskite solar cells will also be discussed.

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