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A new tetracyclic lactam polymer building block for thick, broad-bandgap photovoltaics

Kroon, Renee and Mendaza, Amaia Diaz de Zerio and Himmelberger, Scott and Bergqvist, Jonas and Bäcke, Olof and Faria, Gregório Couto and Gao, Feng and Obaid, Abdulmalik and Zhuang, Wenliu and Gedefaw, Desta and Olsson, Eva and Inganäs, Olle and Salleo, Alberto and Müller, Christian and Andersson, Mats R. (2014) A new tetracyclic lactam polymer building block for thick, broad-bandgap photovoltaics. Journal of the American Chemical Society, 136 . pp. 11578-11581. ISSN 0002-7863

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Abstract

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.

Item Type: Journal Article
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
Divisions: Faculty of Science, Technology and Environment (FSTE) > School of Biological and Chemical Sciences
Depositing User: Generic Email
Date Deposited: 29 Aug 2018 13:36
Last Modified: 29 Aug 2018 13:36
URI: http://repository.usp.ac.fj/id/eprint/10900
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