The effect of residual palladium catalyst on the performance and stability of PCDTBT:PC70BM organic solar cells
The effect of residual palladium catalyst on the performance and stability of PCDTBT:PC70BM organic solar cells
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DOI：
10.1016/j.orgel.2015.10.001
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发表时间：
2015-12-01
影响因子：
3.2
通讯作者：
Lidzey, David G.
中科院分区：
文献类型：
--
作者：
Bracher, Christopher;Yi, Hunan;Lidzey, David G.
钯（Pd）通常用作共轭聚合物聚合的催化剂，如聚in -9'-庚烷- 1-2,7-羧唑-醇-5,5-（4',7'-二-2-壬- 1-2',1',3'-苯并噻唑）]（PCDTBT）。本文研究了残余催化剂对基于pcdbt：富勒烯薄膜共混物的有机光伏器件（opv）性能的影响。我们发现，随着Pd相对浓度的增加，PV的功率转换效率降低，当Pd浓度增加到2570 ppm（相对于PCDTBT）时，PV的功率转换效率从4.55%下降到2.42%。效率的降低主要是由于PV填充系数和分流电阻的降低，这表明器件内存在电流分流。利用光学显微镜、激光束感应电流映射和扫描电子显微镜，我们能够证明这种电流分流与微米级的含pd纳米颗粒聚集体有关。我们表明，在pcdbt OPV中存在高浓度的Pd会导致初始“老化”期间效率的较大下降。(C) 2015年作者。这是一篇基于CC by许可的开放获取文章。
Palladium (Pd) is commonly used as a catalyst in the polymerisation of conjugated polymers such as poly IN-9'-heptadecany1-2,7-carbozole-alt-5,5-(4',7'-di-2-theny1-2',1',3'-benzothiadiazole)] (PCDTBT). Here we explore the effect of residual catalyst on the performance of organic photovoltaic devices (OPVs) based on a PCDTBT:fullerene thin-film blend. We find that as the relative concentration of Pd increases, the power conversion efficiency of the PV is reduced, dropping from 4.55% to 2.42% as the Pd concentration was increased to 2570 ppm (relative to that of the PCDTBT). This reduction in efficiency resulted primarily from a reduction in PV fill factor and shunt-resistance, indicating the presence of current-shunts within the device. Using optical microscopy, laser beam induced current mapping and scanning electron microscopy, we are able to demonstrate that such current shunts are associated with micron-sized aggregates of Pd-containing nanoparticles. We show that the presence of high concentrations of Pd within a PCDTBT OPV contribute to a larger drop in efficiency during the initial 'burn-in' period. (C) 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license.