A New Tetracyclic Lactam Building Block for Thick, Broad-Bandgap Photovoltaics
Artikel i vetenskaplig tidskrift, 2014
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.
Författare
Renee Kroon
University of South Australia
Chalmers, Kemi- och bioteknik, Polymerteknologi
Amaia Diaz de Zerio Mendaza
Chalmers, Kemi- och bioteknik, Polymerteknologi
Scott Himmelberger
Chalmers, Teknisk fysik
J. Bergqvist
Stanford University
Olof Bäcke
Chalmers, Teknisk fysik, Eva Olsson Group
Gregório Couto Faria
Stanford University
Universidade de Sao Paulo (USP)
Feng Gao
Linköpings universitet
Abdulmalik Obaid
Wake Forest University
Wenliu Zhuang
Chalmers, Kemi- och bioteknik, Polymerteknologi
Desta Antenehe Gedefaw
Chalmers, Kemi- och bioteknik, Polymerteknologi
Eva Olsson
Chalmers, Teknisk fysik, Eva Olsson Group
Olle Inganäs
Linköpings universitet
Alberto Salleo
Stanford University
Christian Müller
Chalmers, Kemi- och bioteknik, Polymerteknologi
Mats Andersson
Chalmers, Kemi- och bioteknik, Polymerteknologi
Journal of the American Chemical Society
0002-7863 (ISSN) 1520-5126 (eISSN)
Vol. 136 33 11578-11581Ämneskategorier
Polymerkemi
Styrkeområden
Nanovetenskap och nanoteknik
Energi
Materialvetenskap
DOI
10.1021/ja5051692