Charge Injection, Carriers Recombination and HOMO Energy Level Relationship in Perovskite Solar Cells

Abstract We present a comparative study between a series of well-known semiconductor polymers, used in efficient organic solar cells as hole transport materials (HTM), and the state-of-the art material used as hole transport material in perovskite solar cells: the spiro-OMeTAD. The observed differen...

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Autores principales:	Jesús Jiménez-López, Werther Cambarau, Lydia Cabau, Emilio Palomares
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/08ea85eae9384ea0991fc66abc5a291f
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spelling	oai:doaj.org-article:08ea85eae9384ea0991fc66abc5a291f2021-12-02T16:08:20ZCharge Injection, Carriers Recombination and HOMO Energy Level Relationship in Perovskite Solar Cells10.1038/s41598-017-06245-52045-2322https://doaj.org/article/08ea85eae9384ea0991fc66abc5a291f2017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-06245-5https://doaj.org/toc/2045-2322Abstract We present a comparative study between a series of well-known semiconductor polymers, used in efficient organic solar cells as hole transport materials (HTM), and the state-of-the art material used as hole transport material in perovskite solar cells: the spiro-OMeTAD. The observed differences in solar cell efficiencies are studied in depth using advanced photoinduced spectroscopic techniques under working illumination conditions. We have observed that there is no correlation between the highest occupied molecular orbital (HOMO) energy levels of the organic semiconductors and the measured open-circuit voltage (VOC). For instance, spiro-OMeTAD and P3HT have a comparable HOMO level of ~5.2 eV vs vacuum even though a difference in VOC of around 200 mV is recorded. This difference is in good agreement with the shift observed for the charge vs voltage measurements. Moreover, hole transfer from the perovskite to the HTM, estimated qualitatively from fluorescence quenching and emission lifetime, seems less efficient for the polymeric HTMs. Finally, the recombination currents from all devices were estimated by using the measured charge (calculated using photoinduced differential charging) and the carriers’ lifetime and their value resulted in accordance with the registered short-circuit currents (JSC) at 1 sun.Jesús Jiménez-LópezWerther CambarauLydia CabauEmilio PalomaresNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jesús Jiménez-López Werther Cambarau Lydia Cabau Emilio Palomares Charge Injection, Carriers Recombination and HOMO Energy Level Relationship in Perovskite Solar Cells
description	Abstract We present a comparative study between a series of well-known semiconductor polymers, used in efficient organic solar cells as hole transport materials (HTM), and the state-of-the art material used as hole transport material in perovskite solar cells: the spiro-OMeTAD. The observed differences in solar cell efficiencies are studied in depth using advanced photoinduced spectroscopic techniques under working illumination conditions. We have observed that there is no correlation between the highest occupied molecular orbital (HOMO) energy levels of the organic semiconductors and the measured open-circuit voltage (VOC). For instance, spiro-OMeTAD and P3HT have a comparable HOMO level of ~5.2 eV vs vacuum even though a difference in VOC of around 200 mV is recorded. This difference is in good agreement with the shift observed for the charge vs voltage measurements. Moreover, hole transfer from the perovskite to the HTM, estimated qualitatively from fluorescence quenching and emission lifetime, seems less efficient for the polymeric HTMs. Finally, the recombination currents from all devices were estimated by using the measured charge (calculated using photoinduced differential charging) and the carriers’ lifetime and their value resulted in accordance with the registered short-circuit currents (JSC) at 1 sun.
format	article
author	Jesús Jiménez-López Werther Cambarau Lydia Cabau Emilio Palomares
author_facet	Jesús Jiménez-López Werther Cambarau Lydia Cabau Emilio Palomares
author_sort	Jesús Jiménez-López
title	Charge Injection, Carriers Recombination and HOMO Energy Level Relationship in Perovskite Solar Cells
title_short	Charge Injection, Carriers Recombination and HOMO Energy Level Relationship in Perovskite Solar Cells
title_full	Charge Injection, Carriers Recombination and HOMO Energy Level Relationship in Perovskite Solar Cells
title_fullStr	Charge Injection, Carriers Recombination and HOMO Energy Level Relationship in Perovskite Solar Cells
title_full_unstemmed	Charge Injection, Carriers Recombination and HOMO Energy Level Relationship in Perovskite Solar Cells
title_sort	charge injection, carriers recombination and homo energy level relationship in perovskite solar cells
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/08ea85eae9384ea0991fc66abc5a291f
work_keys_str_mv	AT jesusjimenezlopez chargeinjectioncarriersrecombinationandhomoenergylevelrelationshipinperovskitesolarcells AT werthercambarau chargeinjectioncarriersrecombinationandhomoenergylevelrelationshipinperovskitesolarcells AT lydiacabau chargeinjectioncarriersrecombinationandhomoenergylevelrelationshipinperovskitesolarcells AT emiliopalomares chargeinjectioncarriersrecombinationandhomoenergylevelrelationshipinperovskitesolarcells
_version_	1718384512976551936

Charge Injection, Carriers Recombination and HOMO Energy Level Relationship in Perovskite Solar Cells

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