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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


Long-Term Chemical Aging of Hybrid Halide Perovskites

DC Field Value Language Park, Byung-wook ko Lee, Dong Uk ko Jung, Daesung ko Yang, Woon Seok ko Thi Kim Oanh Vu ko Shin, Tae Joo ko Baik, Jaeyoon ko Hwang, Chan-Cuk ko Kim, Eun Kyu ko Seok, Sang Il ko 2019-10-08T01:02:23Z - 2019-09-06 ko 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 -
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 ko
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