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

Chalmers, Kemi- och bioteknik, Polymerteknologi

Amaia Diaz de Zerio Mendaza

Chalmers, Kemi- och bioteknik, Polymerteknologi

Scott Himmelberger

Chalmers University of Technology

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 11578-11581

Ämneskategorier

Polymerkemi

Styrkeområden

Nanovetenskap och nanoteknik

Energi

Materialvetenskap

DOI

10.1021/ja5051692