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A New Tetracyclic Lactam Building Block for Thick, Broad-Bandgap Photovoltaics
Article in journal
Renee Kroon, Amaia Diaz de Zerio Mendaza, Scott Himmelberger, Jonas Bergqvist, Olof Backe, Gregorio Couto Faria, Feng Gao, Abdulmalik Obaid, Wenliu Zhuang, Desta Gedefaw, Eva Olsson, Olle Inganäs, Alberto Salleo, Christian Muller, Mats R. Andersson
Publication Year
Journal of the American Chemical Society, 2014, (136)33, 11578-11581
Link to Source (DOI)
<p>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 pi-stacking of the polymer backbone, which was retained in PTNT:firllerene 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 596 for greater than200 nm thick active layers, regardless of variations in blend stoichiometry and nanostructure. Moreover, efficiencies of greater than4% could be retained when thick active layers of similar to 400 rim 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.</p>