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Anode modified for organic solar cell characteristics

Author: ZhangMi
Tutor: QiuTianLong；WuYunFeng
School: University of Electronic Science and Technology
Course: Optical Engineering
Keywords: An organic solar cell Anode modification Photoelectric conversion efficiency
CLC: TM914.4
Type: Master's thesis
Year: 2011
Downloads: 120
Quote: 1
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Abstract


In the organic solar battery of the small molecule, the electrode is usually the material used for the transparent conductive oxide, among which the indium tin oxide film is most common. In this paper, we use the Ag film to replace the ITO as the anode of the organic solar cell, the organic layer is Copper phthalocyanine (CuPc) / Fullerene (C60) / bathocuproine (BCP), the applied covering layer (capping Layer Ag thin film translucent cathode) NPB (α-naphthylphenylbiphenyl diamine) the element structure of the anode conducting prior to the thermal evaporation of the organic material using the UV-Ozone oxidation treatment for different time (0-150 sec). Discussed according to the experimental data, and to analyze changes in: (1) after UV-Ozone oxidation treatment after the anode of the physical and photovoltaic characteristics. Formed AgO_x layer of the anode surface, the anode surface work function (Φ), the surface morphology, the surface roughness (Ra), and thin film resistors, the value of the majority of the above characteristics are increased with the growth of the exposure time of the UV-Ozone; (2) into the light of the organic solar battery with conventional bottom different components used in the present experiments the cathode into the light, that is, the light entering at the top. This requires a cathode both should have good electrical conductivity, but also light having a high transmittance. We chose Ag thin film as the cathode, and to find the parameters of the optimal thickness by adjusting the thickness of the film, in between the transmission rate and the conductivity. Furthermore, in order to further enhance the rate of the light transmittance of the cathode to enhance the photoelectric conversion efficiency of the organic solar battery, the cathode above the Ag thin film, we added a covering layer of NPB. NPB added to enhance the cathode transmittance, but also enhance the stability of the device; (3) work function and surface roughness dominate the performance of the organic solar battery, the opposite of the role of both of them for the photoelectric conversion efficiency. When increasing the work function of the anode surface, the energy difference between the CuPc and the anode is reduced, is conducive to injection of holes, an increase of the open circuit voltage (Voc). When the surface roughness increases, it will cause the the partial trap density is increased, which hinders the injection of holes, reducing the open circuit voltage. It also reduces the reflectivity, thereby reducing the short circuit current (JSC). In this article optimization element Ag anode by UV-Ozone surface oxidation processing time is 45 sec, the highest photoelectric conversion efficiency was 1.04%, the open-circuit voltage (Voc) of 0.48V, short-circuit current JSC was 3.56 mA/cm2, the fill factor ( fill factor) of 60.7%.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Photocell > Solar cells
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