Optimising the efficiency of carbazole co-polymer solar-cells by control over the metal cathode electrode
Optimising the efficiency of carbazole co-polymer solar-cells by control over the metal cathode electrode
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DOI：
10.1016/j.orgel.2012.03.039
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发表时间：
2012-08
影响因子：
3.2
通讯作者：
Darren C. Watters;J. Kingsley;Hunan Yi;Tao Wang;A. Iraqi;David G Lidzey
中科院分区：
文献类型：
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作者：
Darren C. Watters;J. Kingsley;Hunan Yi;Tao Wang;A. Iraqi;David G Lidzey
基于共轭聚合物poly[N-9′-heptadecanyl-2，7-carbazole-alt-5，5-(4′，7′-di-2-thienyl-2′，1′，3′-benzothiadiazole)](PCDTBT)与富勒烯受体PC70BM的共混，我们探索了一系列不同的阴极材料对有机(聚合物)太阳电池功率转换效率的影响。我们利用传输矩阵反射率模型量化了阴极的光学性质和器件结构对其工作效率的影响，并与实验测量结果进行了比较。我们发现，光学和电学效应都通过对短路电流、开路电压和填充因子的影响来决定器件的整体效率。我们使用我们的模型来证明，由薄的(60-70 nm)有源半导体层和由5 nm厚的钙层组成的复合阴极组成的器件结合了低的光学损耗、改进的电荷提取和优化的功率转换效率。
We have explored the effect of a range of different cathode materials on the power conversion efficiency of organic (polymer) solar cells based on a blend of the conjugated polymer poly[N-9′-heptadecanyl-2,7-carbazole-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)] (PCDTBT) with the fullerene acceptor PC70BM. We use a transfer matrix reflectivity model to quantify the optical properties of the cathode and the device structure on its operational efficiency and compare this with the results of experimental measurements. We show that both optical and electrical effects play a role in determining overall device efficiency through their impact on short-circuit current, open circuit voltage and fill-factor. We use our model to demonstrate that devices composed of a thin (60–70nm) active semiconductor layer and a composite cathode composed of a 5nm thick layer of calcium capped by aluminium combine low optical loss and improved charge extraction and optimised power conversion efficiency.