Research of Light-Emitting Diodes and Organic Solar Cell with Graphene and ITO Electrode

• Main Authors: Yi-Ting Shih, 施易廷
• Other Authors: Yi-Tsung Chang
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/vg8j63

碩士 === 國立中山大學 === 電機工程學系研究所 === 103 === In this study, Organic solar cells with the Al/P3HT/PEDOT:PSS/ITO structure on glass substrate was investigated and examined the performance of the polymer solar cells by changing 60, 70 and 80nm thickness of the P3HT active layer. This device had better absorbance in the active layer and poor charges collect in the electrode with increase thickness of active layer were observed. It is found that the best properties that the single layer organic solar cell with open-circuit voltage 0.825 V, short-circuit current density 4E-4 mA and power conversion efficiency of 3.7E-5% was achieved under illumination 100 mW/cm2. A single layer of organic solar cells with the Al/P3HT:PCBM/PEDOT: PSS/Graphene structure on glass substrate was investigated in this paper was investigated in this paper, and examined the performance of the polymer solar cells by changing the numbers of graphene layers. After that, we compared graphene solar cells to solar cells with ITO as an electrode. Graphene has excellent electronic properties, such as carrier mobility, high transparency which improve the light absorption of solar cells. We found that the best performance of our research was the solar cell with 2-layer Graphene as the electrode. It shows the properties of open-circuit voltage 0.761 V, short-circuit current 4.092 mA/〖cm〗^2 and power conversion efficiency 0.56%. The second part of this study, the active layer of organic light-emitting diodes (OLEDs) of PVK: Rubrene are measured OLEDs electrical-optical characteristics. OLEDs structures are Grpahene/ PEDOT: PSS (65 nm)/ PVK: x wt% Rubrene / Al (100 nm). Each device area is 0.0625cm2. Because of the quenching effect, the active layer of OLEDs doped with 0, 5, 10, 15 wt% Rubrene are investigated. The OLED of the active layer doping with 5 wt% Rubrene has the best electrical-optical characteristics: threshold voltage of 22.3 V. The structure of Grpahene/ PEDOT: PSS (65 nm)/ PVK: 5 wt% Rubrene / Al (100 nm) with different Graphene layers 1 to 3 are found that 2-layer has the lowest threshold voltage, however, higher than the device with ITO electrode.