Details

Autor(en) / Beteiligte

• Park, Byung-wook
• Lee, Dong Uk
• Jung, Daesung
• Yang, Woon Seok
• Oanh Vu, Thi Kim
• Shin, Tae Joo
• Baik, Jaeyoon
• Hwang, Chan-Cuk
• Kim, Eun Kyu
• Seok, Sang Il

Titel

Long-Term Chemical Aging of Hybrid Halide Perovskites

Ist Teil von

• Nano letters, 2019-08, Vol.19 (8), p.5604-5611

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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: I3 –) 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 I3 – 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.