Compositional engineering in perovskite solar cells
Sushobhan Avasthi a
a Indian Institute of Science, Bengaluru, IN, Bangalore, India
Online Conference
Proceedings of Online Conference on Perovskites for Energy Harvesting: From Fundamentals to Devices (PERENHAR)
Online, Spain, 2020 November 19th - 20th
Organizers: Dinesh Kabra, Sandheep Ravishankar, Angshuman Nag and Priya Mahadevan
Invited Speaker, Sushobhan Avasthi, presentation 040
Publication date: 2nd November 2020

Perovskite solar cells are low cost, easy to fabricate, and most importantly efficient. However, there are challenges. Stability is an issue. So is repeatability and scalability. In this talk I will highlight some of the advances made by the group in IISc to solve these problems using compositions engineering. We shall demonstrate how a novel cation, acetamidinium, can lead to more stable solar cells that are also more efficient. The stronger hydrogen bonding and restricted rotation make for a more stable lattice. We shall show novel transport layers that are potentially cheaper, and more stable than spiro-OMeTAD. While it is well-known that band-alignment and passivation are important, the interfaces in perovskite are still mysterious. We shall also discuss methodologies to improve morphology, which impact both stability and scalability. Some of these techniques are very important for upscaling, because anti-solvent treatment does not lend itself to printing.

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