Investigation of Hole Transport Layer for the Properties of Organic Solar Cells

• Main Authors: Chi-Chu Tsai, 蔡嵇竹
• Other Authors: 閔庭輝
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/82268d

碩士 === 國立虎尾科技大學 === 光電與材料科技研究所在職專班 === 98 === The device structure of organic solar cell (OSC) is glass substrate/anode/active layer/cathode in this study. The indium tin oxide (ITO) and aluminum (Al) are used as anode and cathode, respectively. The copper phthalocyanine: buckminsterfullerene (CuPc: C60) and bathocuproine (BCP) were used as active layer and electron transport layer, respectively. In this study, the properties of OSCs are improved by insertion of the hole transport layer as poly3, 4-ethylenedioxythiophene: polystyrenesulfonate (PEDOT: PSS) and CuPc between the anode and active layer. In this experiment, the PEDOT: PSS is deposited on ITO by the spin coating method. The short current of OSCs is not influenced by the change in the rotational speed of spin coating from 2000~4500 rpm. The short current of OSCs is not improved by using the PEDOT: PSS. In order to improve the short current of OSCs, the glycerin is used to improve conductivity of PEDOT: PSS. When the glycerin is doped into PEDOT: PSS at 0.7 g, the short current of OSCs is increased at 8.8 mA/cm2. Although the short current of OSCs was increased, the open circuit voltage of OSCs was decreased. In order to improve the open circuit voltage of OSCs, the CuPc is inserted between the PEDOT: PSS and active layer. The thickness of CuPc is varied in the range from 2 to 8 nm. When the thickness of CuPc is 4 nm, the open circuit voltage, short current and power conversion efficiency (PCE) of OSCs are 0.46V, 8.8 mA/cm2 and 1.37 %, respectively.