Experimental Evidence for Defect Tolerance in Pb-Halide Perovskites
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866913239159275520 |
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| author | Jasti, Naga Prathibha Levine, Igal Feldman, Yishay Hodes, Gary Aharon, Sigalit Cahen, David |
| author_facet | Jasti, Naga Prathibha Levine, Igal Feldman, Yishay Hodes, Gary Aharon, Sigalit Cahen, David |
| contents | The term defect tolerance (DT) is used often to rationalize the exceptional optoelectronic properties of Halide Perovskites (HaPs) and their devices. Even though DT lacked direct experimental evidence, it became a "fact" in the field. DT in semiconductors implies that structural defects do not translate to electrical and optical effects (e.g., due to charge trapping), associated with such defects. We present the first direct experimental evidence for DT in Pb-HaPs by comparing the structural quality of 2-dimensional (2D), 2D-3D, and 3D Pb-iodide HaP crystals with their optoelectronic characteristics using high-sensitivity methods. Importantly, we get information from the materials' bulk, because we sample at least a few hundred nanometers, up to several micrometers, from the sample's surface, which allows for assessing intrinsic bulk (and not only surface-) properties of HaPs. The results point to DT in 3D, 2D-3D, and 2D Pb-HaPs. Overall, our data provide an experimental basis to rationalize DT in Pb-HaPs. These experiments and findings can guide the search for, and design of other materials with DT. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2305_16017 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Experimental Evidence for Defect Tolerance in Pb-Halide Perovskites Jasti, Naga Prathibha Levine, Igal Feldman, Yishay Hodes, Gary Aharon, Sigalit Cahen, David Materials Science Applied Physics The term defect tolerance (DT) is used often to rationalize the exceptional optoelectronic properties of Halide Perovskites (HaPs) and their devices. Even though DT lacked direct experimental evidence, it became a "fact" in the field. DT in semiconductors implies that structural defects do not translate to electrical and optical effects (e.g., due to charge trapping), associated with such defects. We present the first direct experimental evidence for DT in Pb-HaPs by comparing the structural quality of 2-dimensional (2D), 2D-3D, and 3D Pb-iodide HaP crystals with their optoelectronic characteristics using high-sensitivity methods. Importantly, we get information from the materials' bulk, because we sample at least a few hundred nanometers, up to several micrometers, from the sample's surface, which allows for assessing intrinsic bulk (and not only surface-) properties of HaPs. The results point to DT in 3D, 2D-3D, and 2D Pb-HaPs. Overall, our data provide an experimental basis to rationalize DT in Pb-HaPs. These experiments and findings can guide the search for, and design of other materials with DT. |
| title | Experimental Evidence for Defect Tolerance in Pb-Halide Perovskites |
| topic | Materials Science Applied Physics |
| url | https://arxiv.org/abs/2305.16017 |