Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611, United States.
ACS Appl Mater Interfaces. 2012 Feb;4(2):866-70. doi: 10.1021/am201537p. Epub 2012 Jan 30.
We have studied the performance of normal and inverted bulk-heterojunction solar cells with an active layer composed of a blend of poly[(4,4'-bis(2-ethylhexyl)dithieno[3,2-b:2',3'-d]silole)-2,6-diyl-alt-(2,1,3-benzothiadiazole)-4,7-diyl] (PDTS-BTD) and {6,6}-phenyl-C71 butyric acid methyl ester (PC(71)BM). For inverted cells, a thin layer of ZnO nanoparticles and MoO(3) were used as interlayers for the bottom cathode and the top anode respectively. To enhance the device performance, a thin film of 4,4',4″-tris[N-(3-methylphenyl)-N-phenylamino]triphenylamine (MTDATA) was used along with MoO(3) as an anode interlayer to improve the hole extraction from the photoactive layer to the anode. The inverted polymer solar cells with double interlayer exhibit a higher power conversion efficiency of 6.45% compared to the conventional cell of 4.91% due to efficient charge extraction and favorable vertical morphology of active layer blend. Our ultraviolet photoemission spectroscopy results indicate that the formation of band bending due to interlayer leads to the enhancement in hole extraction.
我们研究了由聚(4,4'-双(2-乙基己基)二噻吩并[3,2-b:2',3'-d]硅氧烷)-2,6-二基-alt-(2,1,3-苯并噻二唑)-4,7-二基和{6,6}-苯基-C71 丁酸甲酯(PC(71)BM)的混合物组成的活性层的正常和倒置体异质结太阳能电池的性能。对于倒置电池，使用氧化锌纳米粒子和 MoO(3)的薄层分别作为底部阴极和顶部阳极的中间层。为了提高器件性能，使用了一层薄薄的 4,4',4″-三[N-(3-甲基苯基)-N-苯基氨基]三苯基胺(MTDATA)，并与 MoO(3)一起用作阳极中间层，以提高光活性层混合物中从阳极提取空穴的效率。具有双层中间层的倒置聚合物太阳能电池的功率转换效率为 6.45%，而传统电池的功率转换效率为 4.91%，这是由于有效的电荷提取和活性层混合物的有利垂直形态。我们的紫外光电子能谱结果表明，由于中间层的形成导致能带弯曲，从而提高了空穴提取效率。
