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Understanding how excess lead iodide precursor improves halide perovskite solar cell performance
The presence of excess lead iodide in halide perovskites has been key for surpassing 20% photon-to-power conversion efficiency. To achieve even higher power conversion efficiencies, it is important to understand the role of remnant lead iodide in these perovskites. To that end, we explored the mecha...
Autores principales: | , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Nature Publishing Group UK
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6098034/ https://www.ncbi.nlm.nih.gov/pubmed/30120225 http://dx.doi.org/10.1038/s41467-018-05583-w |
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author | Park, Byung-wook Kedem, Nir Kulbak, Michael Lee, Do Yoon Yang, Woon Seok Jeon, Nam Joong Seo, Jangwon Kim, Geonhwa Kim, Ki Jeong Shin, Tae Joo Hodes, Gary Cahen, David Seok, Sang Il |
author_facet | Park, Byung-wook Kedem, Nir Kulbak, Michael Lee, Do Yoon Yang, Woon Seok Jeon, Nam Joong Seo, Jangwon Kim, Geonhwa Kim, Ki Jeong Shin, Tae Joo Hodes, Gary Cahen, David Seok, Sang Il |
author_sort | Park, Byung-wook |
collection | PubMed |
description | The presence of excess lead iodide in halide perovskites has been key for surpassing 20% photon-to-power conversion efficiency. To achieve even higher power conversion efficiencies, it is important to understand the role of remnant lead iodide in these perovskites. To that end, we explored the mechanism facilitating this effect by identifying the impact of excess lead iodide within the perovskite film on charge diffusion length, using electron-beam-induced current measurements, and on film formation properties, from grazing-incidence wide-angle X-ray scattering and high-resolution transmission electron microscopy. Based on our results, we propose that excess lead iodide in the perovskite precursors can reduce the halide vacancy concentration and lead to formation of azimuthal angle-oriented cubic α-perovskite crystals in-between 0° and 90°. We further identify a higher perovskite carrier concentration inside the nanostructured titanium dioxide layer than in the capping layer. These effects are consistent with enhanced lead iodide-rich perovskite solar cell performance and illustrate the role of lead iodide. |
format | Online Article Text |
id | pubmed-6098034 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-60980342018-08-20 Understanding how excess lead iodide precursor improves halide perovskite solar cell performance Park, Byung-wook Kedem, Nir Kulbak, Michael Lee, Do Yoon Yang, Woon Seok Jeon, Nam Joong Seo, Jangwon Kim, Geonhwa Kim, Ki Jeong Shin, Tae Joo Hodes, Gary Cahen, David Seok, Sang Il Nat Commun Article The presence of excess lead iodide in halide perovskites has been key for surpassing 20% photon-to-power conversion efficiency. To achieve even higher power conversion efficiencies, it is important to understand the role of remnant lead iodide in these perovskites. To that end, we explored the mechanism facilitating this effect by identifying the impact of excess lead iodide within the perovskite film on charge diffusion length, using electron-beam-induced current measurements, and on film formation properties, from grazing-incidence wide-angle X-ray scattering and high-resolution transmission electron microscopy. Based on our results, we propose that excess lead iodide in the perovskite precursors can reduce the halide vacancy concentration and lead to formation of azimuthal angle-oriented cubic α-perovskite crystals in-between 0° and 90°. We further identify a higher perovskite carrier concentration inside the nanostructured titanium dioxide layer than in the capping layer. These effects are consistent with enhanced lead iodide-rich perovskite solar cell performance and illustrate the role of lead iodide. Nature Publishing Group UK 2018-08-17 /pmc/articles/PMC6098034/ /pubmed/30120225 http://dx.doi.org/10.1038/s41467-018-05583-w Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Park, Byung-wook Kedem, Nir Kulbak, Michael Lee, Do Yoon Yang, Woon Seok Jeon, Nam Joong Seo, Jangwon Kim, Geonhwa Kim, Ki Jeong Shin, Tae Joo Hodes, Gary Cahen, David Seok, Sang Il Understanding how excess lead iodide precursor improves halide perovskite solar cell performance |
title | Understanding how excess lead iodide precursor improves halide perovskite solar cell performance |
title_full | Understanding how excess lead iodide precursor improves halide perovskite solar cell performance |
title_fullStr | Understanding how excess lead iodide precursor improves halide perovskite solar cell performance |
title_full_unstemmed | Understanding how excess lead iodide precursor improves halide perovskite solar cell performance |
title_short | Understanding how excess lead iodide precursor improves halide perovskite solar cell performance |
title_sort | understanding how excess lead iodide precursor improves halide perovskite solar cell performance |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6098034/ https://www.ncbi.nlm.nih.gov/pubmed/30120225 http://dx.doi.org/10.1038/s41467-018-05583-w |
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