Vasilopoulou Maria
Institute of Nanoscience and Nanotechnology (INN), National Centre for Scientific Research "Demokritos", 153 10, Aghia Paraskevi Attikis, Athens, Greece.
Nanoscale. 2014 Nov 21;6(22):13726-39. doi: 10.1039/c4nr04408h.
In this work, the effect of surface hydrogenation of different metal oxides, in particular molybdenum and tungsten oxides widely used to enhance hole extraction and zinc and titanium oxides widely used to enhance electron extraction, on the nanomorphology and the charge generation efficiency of polymer blend solar cells is investigated. It was found that photoactive layers based on blends using different polymers, in particular poly(3-hexythiophene) (P3HT) and poly[(9-(1-octylnonyl)-9H-carbazole-2,7-diyl)-2,5-thiophenediyl-2,1,3-benzothiadiazole-4,7-diyl-2,5-thiophenediyl] (PCDTBT), which normally differ in both morphology and electronic structure, benefited, for both polymers, from deposition on metal oxides with high surface hydrogen content, in the sense that they exhibited improved crystallinity/order as revealed from X-ray diffraction, UV-vis absorption and elipsometric measurements. As a result, increased charge generation efficiencies and reduced recombination losses were measured in solar cells using metal oxides with highly hydrogenated surfaces at bottom electrodes and based on blends of either P3HT or PCDTBT, with a fullerene acceptor, as was verified by transient photocurrent measurements. The power conversion efficiency (PCE) of those cells reached values of 4.5% and 7.2%, respectively, an increase of about 30% compared with the cells using metal oxides with low surface hydrogen content.
在本工作中，研究了不同金属氧化物的表面氢化作用，特别是广泛用于增强空穴提取的钼和钨氧化物以及广泛用于增强电子提取的锌和钛氧化物，对聚合物共混太阳能电池的纳米形貌和电荷产生效率的影响。研究发现，基于不同聚合物（特别是聚（3 - 己基噻吩）（P3HT）和聚[（9 - （1 - 辛基壬基） - 9H - 咔唑 - 2,7 - 二基） - 2,5 - 噻吩二基 - 2,1,3 - 苯并噻二唑 - 4,7 - 二基 - 2,5 - 噻吩二基]（PCDTBT））共混物的光活性层，其形态和电子结构通常不同，对于这两种聚合物而言，沉积在具有高表面氢含量的金属氧化物上均有益，从X射线衍射、紫外可见吸收和椭偏测量结果来看，它们表现出改善的结晶度/有序度。结果，在底部电极使用具有高度氢化表面的金属氧化物且基于P3HT或PCDTBT与富勒烯受体的共混物的太阳能电池中，测量到电荷产生效率提高且复合损失降低，这通过瞬态光电流测量得到了验证。这些电池的功率转换效率（PCE）分别达到4.5%和7.2%，与使用具有低表面氢含量的金属氧化物的电池相比提高了约30%。
