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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Complementary solvent additives tune the orientation of polymer lamellae, reduce the sizes of aggregated fullerene domains, and enhance the performance of bulk heterojunction solar cells
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Complementary solvent additives tune the orientation of polymer lamellae, reduce the sizes of aggregated fullerene domains, and enhance the performance of bulk heterojunction solar cells

机译：辅助溶剂添加剂可调节聚合物薄片的方向，减小聚集的富勒烯域的尺寸并增强整体异质结太阳能电池的性能

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In this study we employed 1-chloronaphthalene (CN) and 1,8-diiodooctane (DIO) as binary additives exhibiting complementarily preferential solubility for processing the crystalline conjugated polymer poly[bis(dodecyl)thiophene-dodecyl-thieno[3,4-c]pyrrole-4,6-dione] (PBTC12TPD) and the fullerene [6,6]-phenyl-C-71-butyric acid methyl ester (PC71BM) in chloroform. Using synchrotron grazing-incidence small-/wide-angle X-ray scattering and transmission electron microscopy to analyse the structure of the PBTC12TPD-PC71BM blend films, we found that the binary additives with different volume ratios in the processing solvent allow us to tune the relative population of face-on to edge-on PBTC12TPD lamellae and the size of PC71BM clusters in the blend films; the sizes of the fractal-like PC71BM clusters and the aggregated domains of PC71BM clusters increased and decreased, respectively, upon increasing the amount of DIO, whereas the relative ratio of face-on to edge-on PBTC12TPD lamellae increased upon increasing the amount of CN. When fabricating the photovoltaic devices, the short-circuit current density of the devices with the PBTC12TPD-PC71BM active layer having been processed with the binary additives is higher than that of the device incorporating an active layer processed without any additive. As a result, the power conversion efficiency of a device incorporating an active layer of PBTC12TPD-PC71BM (1 : 1.5, w/w) processed with binary additives of 0.5% DIO and 1% CN in chloroform increased to 6.8% from a value of 4.9%, a relative increase of 40%, for the corresponding device containing the same active layer but processed without any additive.
机译：在这项研究中，我们使用1-氯萘（CN）和1,8-二碘辛烷（DIO）作为二元添加剂，这些二元添加剂在加工结晶共轭聚合物聚[双（十二烷基）噻吩-十二烷基-噻吩并[3,4-c] ]吡咯-4,6-二酮]（PBTC12TPD）和富勒烯[6,6]-苯基-C-71-丁酸甲酯（PC71BM）在氯仿中。使用同步加速器掠入射小/广角X射线散射和透射电子显微镜分析PBTC12TPD-PC71BM共混膜的结构，我们发现加工溶剂中具有不同体积比的二元添加剂使我们能够调节混合膜中面对面的PBTC12TPD片的相对种群和边缘上的PC71BM簇的大小;随着DIO量的增加，分形样PC71BM簇的大小和PC71BM簇的聚集域分别增加和减少，而面对面的PBTC12TPD薄片的相对比例随着增加CN的数量而增加。 。当制造光伏器件时，具有已经用二元添加剂处理过的PBTC12TPD-PC71BM有源层的器件的短路电流密度高于结合了未经任何添加剂处理的有源层的器件的短路电流密度。结果，结合了用0.5％DIO和1％CN在氯仿中处理的PBTC12TPD-PC71BM（1：1.5，w / w）有源层的器件的功率转换效率从的值提高到6.8％。对于包含相同有源层但未添加任何添加剂的相应器件，该比例为4.9％，相对增加了40％。

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