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A New Tetracyclic Lactam Building Block for Thick, Broad-Bandgap Photovoltaics
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2014-08-06 , DOI: 10.1021/ja5051692
Renee Kroon 1 , Amaia Diaz de Zerio Mendaza , Scott Himmelberger 2 , Jonas Bergqvist 3 , Olof Bäcke , Gregório Couto Faria 2, 4 , Feng Gao 3 , Abdulmalik Obaid 5 , Wenliu Zhuang , Desta Gedefaw , Eva Olsson , Olle Inganäs 3 , Alberto Salleo 2 , Christian Müller , Mats R. Andersson 1
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2014-08-06 , DOI: 10.1021/ja5051692
Renee Kroon 1 , Amaia Diaz de Zerio Mendaza , Scott Himmelberger 2 , Jonas Bergqvist 3 , Olof Bäcke , Gregório Couto Faria 2, 4 , Feng Gao 3 , Abdulmalik Obaid 5 , Wenliu Zhuang , Desta Gedefaw , Eva Olsson , Olle Inganäs 3 , Alberto Salleo 2 , Christian Müller , Mats R. Andersson 1
Affiliation
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A new tetracyclic lactam building block for polymer semiconductors is reported that was designed to combine the many favorable properties that larger fused and/or amide-containing building blocks can induce, including improved solid-state packing, high charge carrier mobility, and improved charge separation. Copolymerization with thiophene resulted in a semicrystalline conjugated polymer, PTNT, with a broad bandgap of 2.2 eV. Grazing incidence wide-angle X-ray scattering of PTNT thin films revealed a strong tendency for face-on π-stacking of the polymer backbone, which was retained in PTNT:fullerene blends. Corresponding solar cells featured a high open-circuit voltage of 0.9 V, a fill factor around 0.6, and a power conversion efficiency as high as 5% for >200 nm thick active layers, regardless of variations in blend stoichiometry and nanostructure. Moreover, efficiencies of >4% could be retained when thick active layers of ∼400 nm were employed. Overall, these values are the highest reported for a conjugated polymer with such a broad bandgap and are unprecedented in materials for tandem and particularly ternary blend photovoltaics. Hence, the newly developed tetracyclic lactam unit has significant potential as a conjugated building block in future organic electronic materials.
中文翻译：
用于厚、宽带隙光伏的新型四环内酰胺构件
据报道，一种用于聚合物半导体的新四环内酰胺结构单元旨在结合较大的稠合和/或含酰胺结构单元可以诱导的许多有利特性，包括改进的固态堆积、高电荷载流子迁移率和改进的电荷分离. 与噻吩共聚产生半结晶共轭聚合物 PTNT，带隙为 2.2 eV。PTNT 薄膜的掠入射广角 X 射线散射显示出聚合物骨架面对面 π 堆积的强烈趋势，这在 PTNT:富勒烯共混物中保留。相应的太阳能电池具有 0.9 V 的高开路电压，0.6 左右的填充因子，对于 >200 nm 厚的有源层，功率转换效率高达 5%，无论混合化学计量和纳米结构的变化如何。此外，当采用约 400 nm 的厚活性层时，可以保持 >4% 的效率。总体而言，这些值是具有如此宽带隙的共轭聚合物的最高报告，并且在用于串联特别是三元共混光伏材料的材料中是前所未有的。因此，新开发的四环内酰胺单元作为未来有机电子材料的共轭结构单元具有巨大的潜力。
更新日期：2014-08-06
中文翻译：
用于厚、宽带隙光伏的新型四环内酰胺构件
据报道，一种用于聚合物半导体的新四环内酰胺结构单元旨在结合较大的稠合和/或含酰胺结构单元可以诱导的许多有利特性，包括改进的固态堆积、高电荷载流子迁移率和改进的电荷分离. 与噻吩共聚产生半结晶共轭聚合物 PTNT，带隙为 2.2 eV。PTNT 薄膜的掠入射广角 X 射线散射显示出聚合物骨架面对面 π 堆积的强烈趋势，这在 PTNT:富勒烯共混物中保留。相应的太阳能电池具有 0.9 V 的高开路电压，0.6 左右的填充因子，对于 >200 nm 厚的有源层，功率转换效率高达 5%，无论混合化学计量和纳米结构的变化如何。此外，当采用约 400 nm 的厚活性层时，可以保持 >4% 的效率。总体而言，这些值是具有如此宽带隙的共轭聚合物的最高报告，并且在用于串联特别是三元共混光伏材料的材料中是前所未有的。因此，新开发的四环内酰胺单元作为未来有机电子材料的共轭结构单元具有巨大的潜力。
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