Cargando…
Tail state limited photocurrent collection of thick photoactive layers in organic solar cells
We analyse organic solar cells with four different photoactive blends exhibiting differing dependencies of short-circuit current upon photoactive layer thickness. These blends and devices are analysed by transient optoelectronic techniques of carrier kinetics and densities, air photoemission spectro...
Autores principales: | , , , , , , , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2019
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6856365/ https://www.ncbi.nlm.nih.gov/pubmed/31727897 http://dx.doi.org/10.1038/s41467-019-12951-7 |
_version_ | 1783470564292165632 |
---|---|
author | Wu, Jiaying Luke, Joel Lee, Harrison Ka Hin Shakya Tuladhar, Pabitra Cha, Hyojung Jang, Soo-Young Tsoi, Wing Chung Heeney, Martin Kang, Hongkyu Lee, Kwanghee Kirchartz, Thomas Kim, Ji-Seon Durrant, James R. |
author_facet | Wu, Jiaying Luke, Joel Lee, Harrison Ka Hin Shakya Tuladhar, Pabitra Cha, Hyojung Jang, Soo-Young Tsoi, Wing Chung Heeney, Martin Kang, Hongkyu Lee, Kwanghee Kirchartz, Thomas Kim, Ji-Seon Durrant, James R. |
author_sort | Wu, Jiaying |
collection | PubMed |
description | We analyse organic solar cells with four different photoactive blends exhibiting differing dependencies of short-circuit current upon photoactive layer thickness. These blends and devices are analysed by transient optoelectronic techniques of carrier kinetics and densities, air photoemission spectroscopy of material energetics, Kelvin probe measurements of work function, Mott-Schottky analyses of apparent doping density and by device modelling. We conclude that, for the device series studied, the photocurrent loss with thick active layers is primarily associated with the accumulation of photo-generated charge carriers in intra-bandgap tail states. This charge accumulation screens the device internal electrical field, preventing efficient charge collection. Purification of one studied donor polymer is observed to reduce tail state distribution and density and increase the maximal photoactive thickness for efficient operation. Our work suggests that selecting organic photoactive layers with a narrow distribution of tail states is a key requirement for the fabrication of efficient, high photocurrent, thick organic solar cells. |
format | Online Article Text |
id | pubmed-6856365 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-68563652019-11-18 Tail state limited photocurrent collection of thick photoactive layers in organic solar cells Wu, Jiaying Luke, Joel Lee, Harrison Ka Hin Shakya Tuladhar, Pabitra Cha, Hyojung Jang, Soo-Young Tsoi, Wing Chung Heeney, Martin Kang, Hongkyu Lee, Kwanghee Kirchartz, Thomas Kim, Ji-Seon Durrant, James R. Nat Commun Article We analyse organic solar cells with four different photoactive blends exhibiting differing dependencies of short-circuit current upon photoactive layer thickness. These blends and devices are analysed by transient optoelectronic techniques of carrier kinetics and densities, air photoemission spectroscopy of material energetics, Kelvin probe measurements of work function, Mott-Schottky analyses of apparent doping density and by device modelling. We conclude that, for the device series studied, the photocurrent loss with thick active layers is primarily associated with the accumulation of photo-generated charge carriers in intra-bandgap tail states. This charge accumulation screens the device internal electrical field, preventing efficient charge collection. Purification of one studied donor polymer is observed to reduce tail state distribution and density and increase the maximal photoactive thickness for efficient operation. Our work suggests that selecting organic photoactive layers with a narrow distribution of tail states is a key requirement for the fabrication of efficient, high photocurrent, thick organic solar cells. Nature Publishing Group UK 2019-11-14 /pmc/articles/PMC6856365/ /pubmed/31727897 http://dx.doi.org/10.1038/s41467-019-12951-7 Text en © The Author(s) 2019 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 Wu, Jiaying Luke, Joel Lee, Harrison Ka Hin Shakya Tuladhar, Pabitra Cha, Hyojung Jang, Soo-Young Tsoi, Wing Chung Heeney, Martin Kang, Hongkyu Lee, Kwanghee Kirchartz, Thomas Kim, Ji-Seon Durrant, James R. Tail state limited photocurrent collection of thick photoactive layers in organic solar cells |
title | Tail state limited photocurrent collection of thick photoactive layers in organic solar cells |
title_full | Tail state limited photocurrent collection of thick photoactive layers in organic solar cells |
title_fullStr | Tail state limited photocurrent collection of thick photoactive layers in organic solar cells |
title_full_unstemmed | Tail state limited photocurrent collection of thick photoactive layers in organic solar cells |
title_short | Tail state limited photocurrent collection of thick photoactive layers in organic solar cells |
title_sort | tail state limited photocurrent collection of thick photoactive layers in organic solar cells |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6856365/ https://www.ncbi.nlm.nih.gov/pubmed/31727897 http://dx.doi.org/10.1038/s41467-019-12951-7 |
work_keys_str_mv | AT wujiaying tailstatelimitedphotocurrentcollectionofthickphotoactivelayersinorganicsolarcells AT lukejoel tailstatelimitedphotocurrentcollectionofthickphotoactivelayersinorganicsolarcells AT leeharrisonkahin tailstatelimitedphotocurrentcollectionofthickphotoactivelayersinorganicsolarcells AT shakyatuladharpabitra tailstatelimitedphotocurrentcollectionofthickphotoactivelayersinorganicsolarcells AT chahyojung tailstatelimitedphotocurrentcollectionofthickphotoactivelayersinorganicsolarcells AT jangsooyoung tailstatelimitedphotocurrentcollectionofthickphotoactivelayersinorganicsolarcells AT tsoiwingchung tailstatelimitedphotocurrentcollectionofthickphotoactivelayersinorganicsolarcells AT heeneymartin tailstatelimitedphotocurrentcollectionofthickphotoactivelayersinorganicsolarcells AT kanghongkyu tailstatelimitedphotocurrentcollectionofthickphotoactivelayersinorganicsolarcells AT leekwanghee tailstatelimitedphotocurrentcollectionofthickphotoactivelayersinorganicsolarcells AT kirchartzthomas tailstatelimitedphotocurrentcollectionofthickphotoactivelayersinorganicsolarcells AT kimjiseon tailstatelimitedphotocurrentcollectionofthickphotoactivelayersinorganicsolarcells AT durrantjamesr tailstatelimitedphotocurrentcollectionofthickphotoactivelayersinorganicsolarcells |