Discerning the Surface and Bulk Recombination Kinetics of Organic–Inorganic Halide Perovskite Single Crystals
Organic–inorganic halide perovskite single crystals possess many outstanding properties conducive for photovoltaic and optoelectronic applications. However, a clear photophysics picture is still elusive, particularly, their surface and bulk photophysics are inexorably convoluted by the spectral abso...
| Main Authors: | , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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2017
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| Online Access: | https://hdl.handle.net/10356/83466 http://hdl.handle.net/10220/42582 |
| _version_ | 1826126024809644032 |
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| author | Wu, Bo Nguyen, Huy Tiep Ku, Zhiliang Han, Guifang Giovanni, David Mathews, Nripan Fan, Hong Jin Sum, Tze Chien |
| author2 | School of Materials Science & Engineering |
| author_facet | School of Materials Science & Engineering Wu, Bo Nguyen, Huy Tiep Ku, Zhiliang Han, Guifang Giovanni, David Mathews, Nripan Fan, Hong Jin Sum, Tze Chien |
| author_sort | Wu, Bo |
| collection | NTU |
| description | Organic–inorganic halide perovskite single crystals possess many outstanding properties conducive for photovoltaic and optoelectronic applications. However, a clear photophysics picture is still elusive, particularly, their surface and bulk photophysics are inexorably convoluted by the spectral absorbance, defects, coexisting photoexcited species, etc. In this work, an all-optical study is presented that clearly distinguishes the surface kinetics from those of the bulk in the representative methylammonium-lead bromide (MAPbBr3) and -lead iodide (MAPbI3) single crystals. It is found that the bulk recombination lifetime of the MAPbBr3 single crystal is shortened significantly by approximately one to two orders (i.e., from ≈34 to ≈1 ns) at the surface with a surface recombination velocity of around 6.7 × 103 cm s−1. The surface trap density is estimated to be around 6.0 × 1017 cm−3, which is two orders larger than that of the bulk (5.8 × 1015 cm−3). Correspondingly, the diffusion length of the surface excited species is ≈130–160 nm, which is considerably reduced compared to the bulk value of ≈2.6–4.3 μm. Furthermore, the surface region has a wider bandgap that possibly arises from the strong lattice deformation. The findings provide new insights into the intrinsic photophysics essential for single crystal perovskite photovoltaics and optoelectronic devices. |
| first_indexed | 2024-10-01T06:46:20Z |
| format | Journal Article |
| id | ntu-10356/83466 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:46:20Z |
| publishDate | 2017 |
| record_format | dspace |
| spelling | ntu-10356/834662021-01-08T05:55:31Z Discerning the Surface and Bulk Recombination Kinetics of Organic–Inorganic Halide Perovskite Single Crystals Wu, Bo Nguyen, Huy Tiep Ku, Zhiliang Han, Guifang Giovanni, David Mathews, Nripan Fan, Hong Jin Sum, Tze Chien School of Materials Science & Engineering School of Physical and Mathematical Sciences Energy Research Institute @ NTU (ERI@N) bulk photophysics charge kinetics Organic–inorganic halide perovskite single crystals possess many outstanding properties conducive for photovoltaic and optoelectronic applications. However, a clear photophysics picture is still elusive, particularly, their surface and bulk photophysics are inexorably convoluted by the spectral absorbance, defects, coexisting photoexcited species, etc. In this work, an all-optical study is presented that clearly distinguishes the surface kinetics from those of the bulk in the representative methylammonium-lead bromide (MAPbBr3) and -lead iodide (MAPbI3) single crystals. It is found that the bulk recombination lifetime of the MAPbBr3 single crystal is shortened significantly by approximately one to two orders (i.e., from ≈34 to ≈1 ns) at the surface with a surface recombination velocity of around 6.7 × 103 cm s−1. The surface trap density is estimated to be around 6.0 × 1017 cm−3, which is two orders larger than that of the bulk (5.8 × 1015 cm−3). Correspondingly, the diffusion length of the surface excited species is ≈130–160 nm, which is considerably reduced compared to the bulk value of ≈2.6–4.3 μm. Furthermore, the surface region has a wider bandgap that possibly arises from the strong lattice deformation. The findings provide new insights into the intrinsic photophysics essential for single crystal perovskite photovoltaics and optoelectronic devices. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) 2017-06-06T04:01:13Z 2019-12-06T15:23:36Z 2017-06-06T04:01:13Z 2019-12-06T15:23:36Z 2016 2016 Journal Article Wu, B., Nguyen, H. T., Ku, Z., Han, G., Giovanni, D., Mathews, N., et al. (2016). Discerning the Surface and Bulk Recombination Kinetics of Organic–Inorganic Halide Perovskite Single Crystals. Advanced Energy Materials, 6(14), 1600551-. 1614-6832 https://hdl.handle.net/10356/83466 http://hdl.handle.net/10220/42582 10.1002/aenm.201600551 194453 en Advanced Energy Materials © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. |
| spellingShingle | bulk photophysics charge kinetics Wu, Bo Nguyen, Huy Tiep Ku, Zhiliang Han, Guifang Giovanni, David Mathews, Nripan Fan, Hong Jin Sum, Tze Chien Discerning the Surface and Bulk Recombination Kinetics of Organic–Inorganic Halide Perovskite Single Crystals |
| title | Discerning the Surface and Bulk Recombination Kinetics of Organic–Inorganic Halide Perovskite Single Crystals |
| title_full | Discerning the Surface and Bulk Recombination Kinetics of Organic–Inorganic Halide Perovskite Single Crystals |
| title_fullStr | Discerning the Surface and Bulk Recombination Kinetics of Organic–Inorganic Halide Perovskite Single Crystals |
| title_full_unstemmed | Discerning the Surface and Bulk Recombination Kinetics of Organic–Inorganic Halide Perovskite Single Crystals |
| title_short | Discerning the Surface and Bulk Recombination Kinetics of Organic–Inorganic Halide Perovskite Single Crystals |
| title_sort | discerning the surface and bulk recombination kinetics of organic inorganic halide perovskite single crystals |
| topic | bulk photophysics charge kinetics |
| url | https://hdl.handle.net/10356/83466 http://hdl.handle.net/10220/42582 |
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