| 학회 | 한국재료학회 |
| 학술대회 | 2012년 가을 (11/07 ~ 11/09, 라카이샌드파인 리조트) |
| 권호 | 18권 2호 |
| 발표분야 | F. 광기능/디스플레이 재료(Optical Funtional and Display Materials) |
| 제목 | Degradation mechanism of the complementary electrochromic systems with WO3 and NiO thin films fabricated by RF sputtering deposition |
| 초록 | Electrochromic devices have been widely investigated due to their potential application in smart windows, automobiles, and architectural glazing to result in energy savings. The optical properties of electrochromic devices in the visible range change as a charge is inserted or extracted. WO3 and NiO shows complementary electrochromic property. In this study, WO3 and NiO thin films were fabricated by RF sputtering deposition method. WO3 and NiO thin film was used a working and a counter electrode, respectively. We have investigated the performance degradation phenomenon and established the degradation mechanism for both WO3 and NiO thin films. In addition to the electrochromic performance tests with a He-Ne laser of 632.8 nm, the morphology of WO3 and NiO thin films before/after transmittance measurement was observed by FE-SEM and AFM. ICP-MS was also carried out for the quantitative analysis on the dissolved WO3 and the delaminated NiO thin films. Based on the long term cycling tests, the transmittance variation (ΔT) depended on the cycling numbers. Electrochromic property of the full cell with WO3 and NiO thin films degraded significantly with a cycling. After about 200 cycles, the transmittance variation was the highest value of 25%. Then, when the cycle test was finished, the transmittance variation was the lowest value of 5%. Interestingly, while WO3 thin films showed gradual degradation, NiO thin films were delaminated after 700 cycles leading to an abrupt degradation of the performance. |
| 저자 | Yoon-Tae Park1, Ki-Tae Lee2 |
| 소속 | 1Division of Advanced Materials Engineering, 2Chonbuk National Univ. |
| 키워드 | Electrochroimc device; WO3; NiO; RF sputtering deposition |
