| 학회 | 한국재료학회 |
| 학술대회 | 2016년 가을 (11/16 ~ 11/18, 경주 현대호텔) |
| 권호 | 22권 2호 |
| 발표분야 | C. 에너지 재료 분과 |
| 제목 | UV Degradation and 1-Sun Light Soaking Induced Recovery of Perovskite Solar Cells. |
| 초록 | Perovskite solar cells are the subject of increasing attention, with a enormous increase in their power conversion efficiency (PCE) from 3.81% to 22.1% in just 6 years. However, perovskite solar cells still suffer from stability issues. Moisture, UV light, heat, and voltage are the analyzed factors of degradation. In terms of UV light, many studies have been carried out under the full solar spectrum in air (i.e., in the presence of moisture and oxygen) or with UV filters under full solar spectrum. These experiment conditions are making difficult to determine a specific effect of UV light alone. We herein examined the degradation of perovskite solar cells in the presence of UV light alone, excluding moisture, oxygen, and other wavelengths of light. Perovskite solar cells were exposed to 365 nm UV light (at open circuit condition, ~25 °C) over 1,000 h under argon atmosphere at ＜0.5 ppm humidity without encapsulation. The long term UV light stability and degradation of perovskite solar cells were examined by UV-visible spectroscopy (absorbance and transmittance), X-ray diffraction (XRD), light current-voltage (LI-V), external quantum efficiency (EQE), μ-photoluminescence spectroscopy (μ-PLS), and μ-light beam induced current (μ-LBIC) measurements. Interestingly, UV degraded perovskite solar cell performance was recovered with 1-sun light soaking. Over 60% of the initial PCE degradation was recovered. This degradation/recovery phenomenon of perovskite solar cells also were observed in other devices in this experiment over a range of UV degradation times. Also during consecutive UV exposure, decreased Jsc and QE were bounced back. 1-sun light soaking induced recovery considered to be caused by the resolving of stacked charges and neutralizing defects. Jsc and QE bounce back phenomenon attributed to beneficial effects of the degradation by-product PbI2 |
| 저자 | Sang-Won Lee1, Seongtak Kim1, Soohyun Bae1, Kyungjin Cho1, Taewon Chung1, Laura E. Mundt2, Seunghun Lee3, Sungeun Park1, Hyomin Park1, Martin C. Schubert2, Stefan W. Glunz2, Yoonmook Kang4, Hae-Seok Lee4, Donghwan Kim1 |
| 소속 | 1Korea Univ., 2Fraunhofer Institute for Solar Energy Systems ISE, 3LG electronics, 4KU-KIST Green School |
| 키워드 | Perovskite; UV stability; Light stability; Recovery; PbI<SUB>2</SUB> |
