Electro-optics of perovskite solar cells

Lin, Qianqian, Armin, Ardalan, Nagiri, Ravi Chandra Raju, Burn, Paul L. and Meredith, Paul (2014) Electro-optics of perovskite solar cells. Nature Photonics, 9 2: 106-112. doi:10.1038/nphoton.2014.284


 
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Author Lin, Qianqian
Armin, Ardalan
Nagiri, Ravi Chandra Raju
Burn, Paul L.
Meredith, Paul
Title Electro-optics of perovskite solar cells
Journal name Nature Photonics   Check publisher's open access policy
ISSN 1749-4893
1749-4885
Publication date 2014-12-01
Sub-type Article (original research)
DOI 10.1038/nphoton.2014.284
Open Access Status
Volume 9
Issue 2
Start page 106
End page 112
Total pages 7
Place of publication London, United Kingdom
Publisher Nature Publishing Group
Collection year 2015
Language eng
Formatted 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 the dielectric constants over a large frequency range. Importantly, we found 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, which strongly indicates a non-excitonic mechanism. Also, Jonscher's Law behaviour was consistent with the perovskite having ionic character. Accurate knowledge of the cell's optical constants allowed improved modelling and design, and using this information we fabricated an optimized device with an efficiency of 16.5%. The optimized devices have ∼100% spectrally flat internal quantum efficiencies and minimal bimolecular recombination. These findings establish systematic design rules to achieve silicon-like efficiencies in simple perovskite solar cells.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Chemistry and Molecular Biosciences
 
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