Replacing Alkoxy Groups with Alkylthienyl Groups: A Feasible Approach To Improve the Properties of Photovoltaic Polymers
Replacing Alkoxy Groups with Alkylthienyl Groups: A Feasible Approach To Improve the Properties of Photovoltaic Polymers
复制标题
用烷基噻吩基取代烷氧基：改善光伏聚合物性能的可行方法
DOI：
10.1002/anie.201103313
复制
发表时间：
2011-01-01
影响因子：
16.6
通讯作者：
Hou, Jianhui
中科院分区：
文献类型：
--
作者：
Huo, Lijun;Zhang, Shaoqing;Hou, Jianhui
聚合物太阳能电池（PSC）由于其通过卷对卷印刷在柔性、轻质和低成本的大面积器件中的潜在应用而引起了人们的广泛关注。[1]体异质结PSC在实现高效率和溶液可加工器件方面显示出先进的功能。这种器件中的活性层由电子给体材料与电子受体材料共混形成的互穿网络组成。[2，3]通常，共轭聚合物[4]用作PSC中的电子供体，富勒烯衍生物用作电子受体[5]。最近，通过使用新的共轭聚合物供体[6-8]或新的富勒烯衍生受体，已经实现了6-7%的功率转换效率（PCE）。[9]短路电流密度（Jsc）、开路电压（Voc）和填充因子（FF）是PSC器件的关键参数，因为器件的PCE与这三个参数的值成比例。通过使用共轭侧链[4c，10，11]或窄带隙共轭聚合物[12-19]来拓宽PSC器件的响应波长范围是实现高Jsc值的有效方法。具有较低HOMO能级的共轭聚合物有助于实现高Voc和PCE值，因为PSC的Voc值与电子供体的HOMO能级和电子受体的LUMO能级之间的偏移成正比。[20]PSiFDTBT，[13] PFDTBT，[21]和PCDTBT [14]是这个概念的三个很好的例子。因此，通过使用具有较低HOMO能级和窄带隙的共轭聚合物，在不同的共轭聚合物家族中实现了高PCE。[第6-8页]
Polymer solar cells (PSCs) have attracted much attention because of their potential application in flexible, light-weight, and low-cost large-area devices through roll-to-roll printing.[1] The bulk heterojunction PSCs showed advanced features in realizing high efficiencies and solution-processible devices. The active layer in this kind of device consists of an interpenetrating network formed by an electron-donor material blended with an electron-acceptor material.[2, 3] Typically, conjugated polymers [4] are used as electron donors and fullerene derivatives are used as the electron acceptors [5] in the PSCs. Recently, power conversion efficiencies (PCEs) of 6–7% have been realized by using new conjugated polymer donors [6–8] or new fullerene-derived acceptors.[9] Short circuit current density (Jsc), open circuit voltage (Voc), and fill factors (FF) are key parameters for a PSC device, because the PCE of the device is proportional to the values of the three parameters. To broaden the response wavelength range of a PSC device by using conjugated side chains [4c, 10, 11] or narrowband-gap conjugated polymers [12–19] is an effective way to realize high Jsc values. Conjugated polymers with lower HOMO levels are helpful in realizing high Voc and PCE values, as the Voc value of PSCs is directly proportional to the offset between the HOMO level of electron donor and the LUMO level of electron acceptor.[20] PSiFDTBT,[13] PFDTBT,[21] and PCDTBT [14] are three excellent examples for this concept. Consequently, by using conjugated polymers with lower HOMO levels and also narrow band gaps, high PCEs were realized in different families of conjugated polymers.[6–8]