S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Mechanical Aerospace Engineering (기계항공공학부) Theses (Master's Degree_기계항공공학부)
Accelerated Life Test of Electrochromic Devices Using Charge Balance Control
전하량 균형을 통한 전기 변색 소자의 가속 수명 시험
- 공과대학 기계항공공학부
- Issue Date
- 서울대학교 대학원
- 학위논문 (석사)-- 서울대학교 대학원 : 공과대학 기계항공공학부, 2018. 8. 안성훈.
- We fabricated 10mm x 10 mm WO3 electrochromic devices (ECDs) using nanoparticle deposition system (NPDS), a type of coating method using kinetic spray. NPDS has the advantage of mass production due to relatively its low pressure and low temperature, while it forms porous surface having bad effect on the durability. In order to verify durability of ECDs, we developed an optical transmittance measurement and voltage control system that enables dynamic control. We then characterized WO3 ECDs focusing on the relationship between transmittance and current under well-known static operating conditions. On the basis of above result, a new algorithm for accelerated life test was proposed considering charge balance and then we conducted the accelerated life test during 1,000,000 cycles. The result showed that optical performance maintained until the test ends. After the accelerated life test, the sample persevered its transmittance performance as 45.4% transmittance difference even after the sample underwent long time operation. It was verified that the durability of ECDs could be enhanced by adopting dynamic control, not using expensive fabricating method.