Electro-optical study of subphthalocyanine in a bilayer organic solar cell
Electro-optical study of subphthalocyanine in a bilayer organic solar cell
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DOI：
10.1002/adfm.200700398
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发表时间：
2007-10-15
影响因子：
19
通讯作者：
Heremans, Paul
中科院分区：
文献类型：
--
作者：
Gommans, Hans;Cheyns, David;Heremans, Paul
通过有机分子束沉积在 Si/SiO2 基底上生长亚酞菁 (SubPc) 超薄膜，并通过光谱椭圆光度法表征其复折射率。消光系数的峰值在 590 nm 处确定为 1.6，介电常数在长波长极限下等于 3.9。与众所周知的金属酞菁相比，这些值非常高，并且将有利于光伏电池的性能。通过原子力显微镜和扫描电子显微镜对氧化铟锡 (ITO) 和石英玻璃顶部的非晶 SubPc 结构进行成像，并且我们对近乎平坦的表面拓扑进行了表征。接下来，通过 AM 1.5 模拟照明和不同光强度下的电流密度-电压表征，研究了平面双层供体/受体异质结中与巴克明斯特富勒烯 (C-60) 组合的亚酞菁薄膜。测得 1 太阳光下的功率转换效率为 3.0%。最后，外部和内部量子效率在 590 nm 处表现出峰值，分别为 46% 和 55%。考虑到供体/受体界面处的突变结，因此确定从 SubPc 到受体材料的电子转移是高效的。
Ultra-thin films of subphthalocyanine (SubPc) were grown onto Si/SiO2 substrates by organic molecular beam deposition and the complex refractive index has been characterized by spectroscopic ellipsometry. The peak maximum in the extinction coefficient is determined to be 1.6 at 590 nm and the dielectric constant equals 3.9 in the limit of long wavelength. These values are extraordinary high when compared to the well-known metal-phthalocyanines and will be beneficial for the performance in a photovoltaic cell. The amorphous SubPc structure on top of indium-tin-oxide (ITO) as well as quartz glass is imaged by atomic force microscopy and scanning electron microscopy and we have characterized the nearly flat surface topology. Next, subphthalocyanine films in combination with buckminsterfullerene (C-60) have been studied in a planar bilayer donor/acceptor hetero-junction by current density-voltage characterization under AM 1.5 simulated illumination at various light intensities. A power conversion efficiency of 3.0 % under 1 sun was measured. Finally, the external and internal quantum efficiencies demonstrated peak maxima at 590 nm of 46 % and 55 %, respectively. Considering the abrupt junction at the donor/acceptor interface, the electron transfer from SubPc to the acceptor material is thus determined to be highly efficient.