Long-Term Chemical Aging of Hybrid Halide Perovskites
- Title
- Long-Term Chemical Aging of Hybrid Halide Perovskites
- Author
- 김은규
- Keywords
- Hybrid perovskite; defect migration; GIWAXS; DLTS; SPEM; HRPES
- Issue Date
- 2019-08
- Publisher
- AMER CHEMICAL SOC
- Citation
- NANO LETTERS, v. 19, no. 8, Page. 5604-5611
- 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.
- URI
- https://pubs.acs.org/doi/10.1021/acs.nanolett.9b02142https://repository.hanyang.ac.kr/handle/20.500.11754/152653
- ISSN
- 1530-6984; 1530-6992
- DOI
- 10.1021/acs.nanolett.9b02142
- Appears in Collections:
- COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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