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Electro-optics of perovskite solar cells / Qianqian Lin; Ardalan Armin; Ravi Chandra Raju Nagiri; Paul L. Burn; Paul Meredith

Nature Photonics, Volume: 9, Issue: 2, Pages: 106 - 112

Swansea University Author: Meredith, Paul

Abstract

Organohalide-perovskite solar cells have emerged as a leading next-generation photovoltaic technology. However, despite surging efficiencies, many questions remain unanswered regarding the mechanisms of operation. Here, we report a detailed study of the electro-optics of efficient CH3NH3PbI3-perovsk...

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Published in: Nature Photonics
ISSN: 1749-4885 1749-4893
Published: 2014
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa33781
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Abstract: Organohalide-perovskite solar cells have emerged as a leading next-generation photovoltaic technology. However, despite surging efficiencies, many questions remain unanswered regarding the mechanisms of operation. Here, we report a detailed study of the electro-optics of efficient CH3NH3PbI3-perovskite-only planar devices. We report dielectric constants over a large frequency range. Importantly, we find the real part of the static dielectric constant to be ~70, from which we estimate the exciton binding energy to be of order 2 meV, strongly indicating a non-excitonic mechanism. We also observe Jonscher's Law behaviour consistent with ionic character. Accurate knowledge of the cell's optical constants allows improved cell modelling and design. Using this information we fabricated an optimised cell with an efficiency of 16.5%. The optimised devices have ~100% spectrally flat IQEs, and minimal bimolecular recombination. These findings establish systematic design rules to achieve silicon-like efficiencies in simple perovskite solar cells.
College: College of Science
Issue: 2
Start Page: 106
End Page: 112