A p-Type NiO-Based Dye-Sensitized Solar Cell with an Open-Circuit Voltage of 0.35 V
A p-Type NiO-Based Dye-Sensitized Solar Cell with an Open-Circuit Voltage of 0.35 V
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DOI：
10.1002/anie.200900423
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发表时间：
2009-01-01
影响因子：
16.6
通讯作者：
Hammarstrom, Leif
中科院分区：
文献类型：
--
作者：
Gibson, Elizabeth A.;Smeigh, Amanda L.;Hammarstrom, Leif
2000年，He等人报道了将nio基光活性阴极与tio2基光阳极结合产生的串联器件的开路电压（VOC）为0.73 V，[1]是独立器件开路电位的总和，其中tio2基电极贡献了0.65 V， nio基电极贡献了0.08 V。串联染料敏化太阳能电池（tdsc），例如He s，一直缺乏针对光电阴极优化的研究，尽管它们在开发更高电压器件方面具有潜力。直到最近，研究人员才开始解决与镍基dsc相关的问题，如低短路光电流（JSC）和低填充因子（FF）。[2-6]我们在本文中提出了使用精心设计的“二元”敏化剂和钴基氧化还原介质的p型NiO染料敏化太阳能电池（p-DSC），在保持1.7 mA cmÀ2的JSC的同时，VOC增加了三倍（0.35 V）。我们将p-DSC转换效率从之前的记录0.055%提高到0.20%，几乎翻了两番。有趣的是，p- dsc内部的改进转化为TDSC性能的改进，即实现VOC为0.91 V， FF为0.62，效率为0.55%。本文报道的结果显示了迄今为止p-DSC光伏效率的最显著提高，强调了分子工程在敏化剂和氧化还原介质开发中的重要性，以实现DSC性能的实质性提高。TDSC的示意图如图1所示。在不同的光处理过程中，敏化剂对光的吸收导致一个电子被注入阳极TiO2的传导带（CB），一个空穴被注入阴极的NiO。这些电荷通过各自的半导体扩散到SnO2: F电荷收集器。为了完成电路，氧化还原介质的氧化和还原形式分别在阴极和阳极再生染料。
In 2000, He et al. reported that the combination of a NiO-based photoactive cathode with a TiO2-based photoanode produced a tandem device with an open-circuit voltage (VOC) of 0.73 V,[1] which is the sum of the open-circuit potentials of the separate devices, where the TiO2-based electrode contributed 0.65 V and the NiO-based electrode 0.08 V. Tandem dye-sensitized solar cells (TDSCs), such as He s, have suffered from the lack of research directed at the optimization of the photocathode, despite the potential they hold in developing higher voltage devices. Only recently have researchers begun to address issues associated with NiO-based DSCs, such as low short-circuit photocurrents (JSC) and poor fill factors (FF).[2–6] We present herein a three-fold increase in VOC(0.35 V), while maintaining a JSC of 1.7 mA cmÀ2, for a p-type NiO dye-sensitized solar cell (p-DSC) employing a carefully designed “dyad” sensitizer and a cobalt-based redox mediator. We have almost quadrupled the p-DSC conversion efficiency from the previous record, 0.055%,[4] to 0.20%. Interestingly, the improvements within the p-DSCs translate to improvements in TDSC performance, namely achieving a VOC of 0.91 V, a FF of 0.62, and an efficiency of 0.55%. The results reported herein present the most significant increase in photovoltaic efficiency of p-DSCs to date, emphasizing the importance of molecular engineering in sensitizer and redox-mediator development to achieve substantial gains in DSC performance.A schematic representation of a TDSC is shown in Figure 1. Absorption of light by the sensitizers, in separate photo-processes, causes an electron to be injected into the conduction band (CB) of the TiO2 at the anode and a hole to be injected into the NiO at the cathode. These charges diffuse through the respective semiconductors to the SnO2: F charge collector. To complete the circuit, the oxidized and reduced forms of the redox mediator regenerate the dye at the cathode and anode, respectively.