储电型柔性有机薄膜太阳电池的基础研究

项目名称： 储电型柔性有机薄膜太阳电池的基础研究

项目编号： No.20876182

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 轻工业、手工业

项目作者： 陈振兴

作者单位： 中山大学

项目金额： 32万元

中文摘要： 针对储电型柔性有机薄膜太阳电池，研究了影响光电转换效率、能量存储密度等关键性能的薄膜生长模式和构效关系。在综合考虑激子扩散效率、载流子收集效率和光吸收效率的基础上，在柔性ITO衬底上依次生长六噻吩薄膜、混合异质结薄膜和富勒烯薄膜。通过调控六噻吩、富勒烯薄膜的生长环境，沉积了晶区大、晶界少的单质薄膜，特别是横卧模式生长六噻吩薄膜，同时使混合异质结薄膜具有良好的互穿网络结构，优化条件下光电转换效率可达1.2%。采用化学法制备了透光性好、可弯曲、电化学性能优异的MnO2薄膜，实现电荷的高密度存储。在0.3A/g电流密度下，MnO2薄膜的恒流充放电曲线对称性好，内阻小，表现出理想的电容特性，比电容为232.9F/g。在10mV/s扫速下循环1000次后比电容仅降低17%，表现出良好的循环使用寿命。

中文关键词： 太阳电池；储电；柔性；六噻吩；薄膜

英文摘要： Flexible energy-storage organic thin film solar cell has been studied. The effect of organic thin film growth mode, energy storage mechanism and cell structure parameters on power conversion efficiency and energy storage density were experimentally investigated. Taking exciton diffusion efficiency, carrier collection efficiency and light absorption efficiency account of solar cell behavior, sexithiophene film, bulk heterojunction film and buckminsterfullerene film were grown in turn on flexible ITO substrate in order to prepare electric-generated zone. Through controlling the growth environment of sexithiophene and buckminsterfullerene, uniform films with large domain and few boundaries were deposited, especially sexithiophene film deposited in lying mode. In the same time, bulk heterojunction film were prepared through co-deposition.Under suitable condition, the power conversion efficiency of the as-prepared thin film solar cell reached to 1.2%.Transparent layered birnessite-type MnO2 thin films were fabricated on flexible ITO/PET substrates for flexible transparent supercapacitors by means of a novel chemical bath deposition technology using KMnO4 as a manganese ion source in an aqueous alkaline medium at room temperature. The transparent layered birnessite-type MnO2 thin films deposited under the optimum conditions exhibited a porous morphology, high hydrophilicity, a transmittance of 80% at 550 nm, special capacitance of 232.9 F g-1 and capacitance retention ratio of 83% after 1000 CV cycles at 10 mV s-1 in 1 M Na2SO4. Bend test showed that as-prepared MnO2 thin films on flexible ITO/PET substrates possessed of excellent mechanical flexibility and electrochemical stability.

英文关键词： solar cell；energy storage；flexible；sexithiophene；fhin film