The influence of cathode buffer layers on the performance of organic solar cells

• Main Authors: Hua-Wei Yuan, 袁華蔚
• Other Authors: Mei-Ying Chang
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/41290190570431246408

碩士 === 國立中山大學 === 光電工程學系研究所 === 100 === According to the literature, the choice of the material, the device structure and the morphology of the active layer play an important role in the performance of the organic solar cell. For instance, many groups insert buffer layer between cathode and active layer to improve device efficiency. Otherwise, the tandem structure have attracted much attention due to different absorbing spectra of the top and bottom cells which can improve the device efficiency. In this study, we select TiOPc as the interlayer material because it can both extend the device absorption spectra and improve device performance. In our results, the thickness of 1 nm TiOPc has the best device efficiency based on the device structure ITO(1750 Å)/PEDOT:PSS(500 Å)/ P3HT:PCBM(800 Å)/TiOPc(10 Å)/Al(2000 Å) and the device area of 0.16 cm2, the performance increase from 0.97 % to 1.77 % compared to standard device under AM1.5 simulation light before post annealing. (which is 82.4 % improved). This consequence can be attributed to a increase open voltage from 0.40 V to 0.56 V, a short increas current density from 5.62 mA/cm2 to 6.16 mA/cm2 and fill factor increased from 0.428 to 0.511. After post annealing at 140 °C, the power efficiency increase for 45.2 % contrast to standard post annealing.