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Seok, Sang Il
Laboratory for Energy Harvesting Materials and Systems (LEHMS)
Research Interests
  • Solar energy conversion, perovskite solar cells, inorganic-organic hybrid materials and processing, solution chemistry

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Long-Term Chemical Aging of Hybrid Halide Perovskites

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dc.contributor.author Park, Byung-wook ko
dc.contributor.author Lee, Dong Uk ko
dc.contributor.author Jung, Daesung ko
dc.contributor.author Yang, Woon Seok ko
dc.contributor.author Thi Kim Oanh Vu ko
dc.contributor.author Shin, Tae Joo ko
dc.contributor.author Baik, Jaeyoon ko
dc.contributor.author Hwang, Chan-Cuk ko
dc.contributor.author Kim, Eun Kyu ko
dc.contributor.author Seok, Sang Il ko
dc.date.available 2019-10-08T01:02:23Z -
dc.date.created 2019-09-06 ko
dc.date.issued 2019-08 ko
dc.identifier.citation NANO LETTERS, v.19, no.8, pp.5604 - 5611 ko
dc.identifier.issn 1530-6984 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/27825 -
dc.description.abstract Because the power conversion efficiency (PCE) of hybrid halide perovskite solar cells (PSCs) could exceed 24%, extensive research has been focused on improving their long-term stability for commercialization in the near future. In a previous study, we reported that the addition of a number of ionized iodide (triiodide: I-3(-)) ions during perovskite film formation significantly improved the efficiency of PSCs by reducing deep-level defects in the perovskite layer. Understanding the relationship between the concentration of these defects and the long-term chemical aging of PSCs is important not only for obtaining fundamental insight into the perovskite materials but also for studying the long-term chemical stability of PSCs. Herein we aim to identify the origin of the natural decay in PCE during long-term chemical aging of PSCs in the dark based on formamidinium lead triiodide by comparing the performance of control and low-defect (LD) devices. After aging for 200 days, the change in the PCE of the LD devices (1.3%) was found to be half that of the control devices (2.6%). We investigated this difference using grazing incidence wide-angle X-ray scattering, deep level transient spectroscopy, scanning photoelectron microscopy, and high-resolution photoemission spectroscopy. The addition of I-3(-) was found to reduce the amounts of hydroxide and O-x in the halide perovskites (HPs), affecting the migration of defects and the structural transformation of the HPs. ko
dc.language 영어 ko
dc.publisher AMER CHEMICAL SOC ko
dc.title Long-Term Chemical Aging of Hybrid Halide Perovskites ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-85070561814 ko
dc.identifier.wosid 000481563800101 ko
dc.type.rims ART ko
dc.identifier.doi 10.1021/acs.nanolett.9b02142 ko
dc.identifier.url https://pubs.acs.org/doi/10.1021/acs.nanolett.9b02142 ko
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