Long-Term Chemical Aging of Hybrid Halide Perovskites
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- Long-Term Chemical Aging of Hybrid Halide Perovskites
- Park, Byung-wook; Lee, Dong Uk; Jung, Daesung; Yang, Woon Seok; Thi Kim Oanh Vu; Shin, Tae Joo; Baik, Jaeyoon; Hwang, Chan-Cuk; Kim, Eun Kyu; Seok, Sang Il
- Issue Date
- AMER CHEMICAL SOC
- NANO LETTERS, v.19, no.8, pp.5604 - 5611
- 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.
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