Journal article 984 views 241 downloads
On the Electro‐Optics of Carbon Stack Perovskite Solar Cells
,
Simone Meroni ,
Trystan Watson ,
Ardalan Armin ,
Paul Meredith
Solar RRL, Volume: 4, Issue: 2, Start page: 1900221
Swansea University Authors:
Robin Kerremans, Oskar Sandberg , Simone Meroni , Trystan Watson , Ardalan Armin , Paul Meredith
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PDF | Accepted Manuscript
28/01/20 ED - Permission to publish. https://application.wiley-vch.de/util/cta/physsci-en.pdf
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DOI (Published version): 10.1002/solr.201900221
Abstract
Mesoporous carbon stack architecture is attracting considerable interest as a candidate for scalable, low‐cost perovskite solar cells amenable to high‐throughput manufacturing. These cells are characterized by microns‐thick mesoporous titania and zirconia layers capped by a nonselective carbon elect...
| Published in: | Solar RRL |
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| ISSN: | 2367-198X 2367-198X |
| Published: |
Wiley
2020
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa52738 |
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| Abstract: |
Mesoporous carbon stack architecture is attracting considerable interest as a candidate for scalable, low‐cost perovskite solar cells amenable to high‐throughput manufacturing. These cells are characterized by microns‐thick mesoporous titania and zirconia layers capped by a nonselective carbon electrode with the whole stack being infused with a perovskite semiconductor. Although the architecture does not deliver the >20% power conversion efficiencies characteristic of perovskite planar and mesoporous geometries, it does produce cells with respectable efficiencies >16%, which is unexpected due to the carbon electrode being a nonideal anode and the active layers being so thick. Optimization of these cells requires an understanding of the coupled efficiencies of light absorption, charge generation, and extraction which is currently unavailable. Herein, a combined experimental‐simulation study that elucidates photogeneration and extraction is reported. By determining the optical constants of the individual components and using effective‐medium approximations, the internal quantum efficiencies (IQE) in both the titania and zirconia layers are determined to be ≈85%. Numerical drift‐diffusion simulations indicate that this high IQE is a consequence of the thick junctions reducing minority carrier concentrations at the electrodes, thereby decreasing surface recombination. This insight can now be used to tune the carbon stack for efficiency and simplicity. |
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| Keywords: |
carbon stack perovskite solar cells; drift-diffusion; internal quantum efficiency; optical modeling |
| College: |
Faculty of Science and Engineering |
| Funders: |
EPSRC. Grant Number: EP/M015254/1
Ser Cymru II, ERDF. Grant Number: Ser Cymru II
Ser Cymru II. Grant Number: Rising Star |
| Issue: |
2 |
| Start Page: |
1900221 |