Photoexcitation dynamics in solution-processed formamidinium lead iodide perovskite thin films for solar cell applications
Abstract Formamidinium lead iodide (FAPbI3) is a newly developed hybrid perovskite that potentially can be used in high-efficiency solution-processed solar cells. Here, the temperature-dependent dynamic optical properties of three types of FAPbI3 perovskite films (fabricated using three different pr...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Publishing Group
2015-12-01
|
| Series: | Light: Science & Applications |
| Subjects: | |
| Online Access: | https://doi.org/10.1038/lsa.2016.56 |
| _version_ | 1797845777051025408 |
|---|---|
| author | Hong-Hua Fang Feng Wang Sampson Adjokatse Ni Zhao Jacky Even Maria Antonietta Loi |
| author_facet | Hong-Hua Fang Feng Wang Sampson Adjokatse Ni Zhao Jacky Even Maria Antonietta Loi |
| author_sort | Hong-Hua Fang |
| collection | DOAJ |
| description | Abstract Formamidinium lead iodide (FAPbI3) is a newly developed hybrid perovskite that potentially can be used in high-efficiency solution-processed solar cells. Here, the temperature-dependent dynamic optical properties of three types of FAPbI3 perovskite films (fabricated using three different precursor systems) are comparatively studied. The time-resolved photoluminescence (PL) spectra reveal that FAPbI3 films made from the new precursor (a mixture of formamidinium iodide and hydrogen lead triiodide) exhibit the longest lifetime of 439 ns at room temperature, suggesting a lower number of defects and lower non-radiative recombination losses compared with FAPbI3 obtained from the other two precursors. From the temperature-dependent PL spectra, a phase transition in the films is clearly observed. Meanwhile, exciton-binding energies of 8.1 and 18 meV for the high- and low-temperature phases are extracted, respectively. Importantly, the PL spectra for all of the samples show a single peak at room temperature, whereas at liquid-helium temperature the emission features two peaks: one in higher energy displaying a fast decay (0.5 ns) and a second red-shifted peak with a decay of up to several microseconds. These two emissions, separated by ~18 meV, are attributed to free excitons and bound excitons with singlet and triplet characters, respectively. |
| first_indexed | 2024-04-09T17:44:24Z |
| format | Article |
| id | doaj.art-e565f76bff294670a658abe3056c1bb6 |
| institution | Directory Open Access Journal |
| issn | 2047-7538 |
| language | English |
| last_indexed | 2024-04-09T17:44:24Z |
| publishDate | 2015-12-01 |
| publisher | Nature Publishing Group |
| record_format | Article |
| series | Light: Science & Applications |
| spelling | doaj.art-e565f76bff294670a658abe3056c1bb62023-04-16T11:25:38ZengNature Publishing GroupLight: Science & Applications2047-75382015-12-0154e16056e1605610.1038/lsa.2016.56Photoexcitation dynamics in solution-processed formamidinium lead iodide perovskite thin films for solar cell applicationsHong-Hua Fang0Feng Wang1Sampson Adjokatse2Ni Zhao3Jacky Even4Maria Antonietta Loi5Photophysics & OptoElectronics, Zernike Institute for Advanced Materials, Nijenborgh 4Department of Electronic Engineering, The Chinese University of Hong KongPhotophysics & OptoElectronics, Zernike Institute for Advanced Materials, Nijenborgh 4Department of Electronic Engineering, The Chinese University of Hong KongUniversité Européenne de Bretagne, INSA, FOTON, UMR 6082Photophysics & OptoElectronics, Zernike Institute for Advanced Materials, Nijenborgh 4Abstract Formamidinium lead iodide (FAPbI3) is a newly developed hybrid perovskite that potentially can be used in high-efficiency solution-processed solar cells. Here, the temperature-dependent dynamic optical properties of three types of FAPbI3 perovskite films (fabricated using three different precursor systems) are comparatively studied. The time-resolved photoluminescence (PL) spectra reveal that FAPbI3 films made from the new precursor (a mixture of formamidinium iodide and hydrogen lead triiodide) exhibit the longest lifetime of 439 ns at room temperature, suggesting a lower number of defects and lower non-radiative recombination losses compared with FAPbI3 obtained from the other two precursors. From the temperature-dependent PL spectra, a phase transition in the films is clearly observed. Meanwhile, exciton-binding energies of 8.1 and 18 meV for the high- and low-temperature phases are extracted, respectively. Importantly, the PL spectra for all of the samples show a single peak at room temperature, whereas at liquid-helium temperature the emission features two peaks: one in higher energy displaying a fast decay (0.5 ns) and a second red-shifted peak with a decay of up to several microseconds. These two emissions, separated by ~18 meV, are attributed to free excitons and bound excitons with singlet and triplet characters, respectively.https://doi.org/10.1038/lsa.2016.56formamidinium lead iodidelow temperatureperovskitephotoluminescencetriplet exciton |
| spellingShingle | Hong-Hua Fang Feng Wang Sampson Adjokatse Ni Zhao Jacky Even Maria Antonietta Loi Photoexcitation dynamics in solution-processed formamidinium lead iodide perovskite thin films for solar cell applications Light: Science & Applications formamidinium lead iodide low temperature perovskite photoluminescence triplet exciton |
| title | Photoexcitation dynamics in solution-processed formamidinium lead iodide perovskite thin films for solar cell applications |
| title_full | Photoexcitation dynamics in solution-processed formamidinium lead iodide perovskite thin films for solar cell applications |
| title_fullStr | Photoexcitation dynamics in solution-processed formamidinium lead iodide perovskite thin films for solar cell applications |
| title_full_unstemmed | Photoexcitation dynamics in solution-processed formamidinium lead iodide perovskite thin films for solar cell applications |
| title_short | Photoexcitation dynamics in solution-processed formamidinium lead iodide perovskite thin films for solar cell applications |
| title_sort | photoexcitation dynamics in solution processed formamidinium lead iodide perovskite thin films for solar cell applications |
| topic | formamidinium lead iodide low temperature perovskite photoluminescence triplet exciton |
| url | https://doi.org/10.1038/lsa.2016.56 |
| work_keys_str_mv | AT honghuafang photoexcitationdynamicsinsolutionprocessedformamidiniumleadiodideperovskitethinfilmsforsolarcellapplications AT fengwang photoexcitationdynamicsinsolutionprocessedformamidiniumleadiodideperovskitethinfilmsforsolarcellapplications AT sampsonadjokatse photoexcitationdynamicsinsolutionprocessedformamidiniumleadiodideperovskitethinfilmsforsolarcellapplications AT nizhao photoexcitationdynamicsinsolutionprocessedformamidiniumleadiodideperovskitethinfilmsforsolarcellapplications AT jackyeven photoexcitationdynamicsinsolutionprocessedformamidiniumleadiodideperovskitethinfilmsforsolarcellapplications AT mariaantoniettaloi photoexcitationdynamicsinsolutionprocessedformamidiniumleadiodideperovskitethinfilmsforsolarcellapplications |