Premium
Facile Monitoring of Fullerene Crystallization in Polymer Solar Cell Blends by UV–vis Spectroscopy
Author(s) -
Lindqvist Camilla,
Wang Ergang,
Andersson Mats R.,
Müller Christian
Publication year - 2014
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201300717
Subject(s) - fullerene , materials science , crystallization , polymer , glass transition , chemical engineering , polymer solar cell , organic solar cell , thermal stability , crystallinity , annealing (glass) , thiophene , spectroscopy , polymer chemistry , micrometer , solar cell , analytical chemistry (journal) , optoelectronics , organic chemistry , chemistry , optics , composite material , physics , quantum mechanics , engineering
A simple technique is demonstrated based on UV–vis spectroscopy that permits the onset of fullerene crystallization to be monitored in polymer:fullerene bulk‐heterojunction blends. The growth of fullerene crystals only occurs during thermal annealing above the glass transition temperature ( T g ) of the blend. Light scattering due to the presence of micrometer‐sized fullerene crystals reduces the apparent transmittance, which can serve as a clear indicator for the upper limit of the T g . This principle is used to deduce this critical parameter for two high‐performance photovoltaic blends that are based on a thiophene–quinoxaline and a thiophene–isoindigo copolymer, respectively. High T g s of 115 and 145 °C promise good thermal stability.
Accelerating Research
Robert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom
Address
John Eccles HouseRobert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom