Poly(3-hexylthiophene)을 이용한 대면적 유기태양전지 제작 및 특성평가

Abstract

Organic solar cells have attracted much interest due to the potential advantages of the lightness, simple solution processing and flexibility. In recent, the focus of organic solar cells research is the optimization of material processing to improve the power conversion efficiency like a synthesis of low band gap conducting polymer. However, area scaling is also important position for alternative to the market dominating solar cells. This study examined the effects of the electrode geometry combined with the cell area on the device performance. We have investigated the effects of cell area in organic solar cells by introducing of metal sub-electrodes to reduce the resistive loss of indium tin oxide, systematically. The metal sub-electrode defines the active area and works as the conducting electrode at the same time with very low resistivity. The series resistance could be reduced significantly by introducing the metal sub-electrode, results in a power conversion efficiency of 2.6±0.3 % up to the cell area of 4.08 cm2 under AM 1.5 (1 sun) simulated illumination with an intensity of 100 mW/cm2. In this study, the devices were fabricated using two different types of coating process as a function of active area. The commonly used coating process, spin-coating, can't fabricate very large-area organic layer uniformly. In this study, spray-coating process were used to fabricate large-area organic solar cells. Spray-coating has several advantages of less material wastage and possibility of large scale photoactive area coating compared with that of spin-coating process. The organic solar cell fabricated by spray-coating method shows similar performance with that of spin-coated device. This indicates that the spray-coating process can be used as a mass production process for fabricating large-area organic solar cells.