Progress in Poly (3-Hexylthiophene) Organic Solar Cells and the Influence of Its Molecular Weight on Device Performance

Andrew Wadsworth, Zeinab Hamid, Matthew Bidwell, Raja Ashraf, Jafar Iqbal Khan, Dalaver H. Anjum, Camila Cendra, Jun Yan, Elham Rezasoltani, Anne A. Y. Guilbert, Mohammed Azzouzi, Nicola Gasparini, James H. Bannock, Derya Baran, Hongbin Wu, John C. de Mello, Christoph J. Brabec, Alberto Salleo, Jenny Nelson, Frédéric LaquaiIain McCulloch

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

Poly (3-hexylthiophene) (P3HT) was an early frontrunner in the development of donor polymers to be used in organic photovoltaics. A relatively straightforward and inexpensive synthesis suggests that it may be the most viable donor polymer to use in large-scale commercial organic solar cells. Replacing fullerenes with new electron acceptors has led to significant improvements in device performance and stability, with devices now able to exceed an efficiency of 7%. Past studies have reported a dependence of device performance on the molecular weight of the polymer in fullerene-containing blends, however, with nonfullerene acceptors now showing promise a similar study was needed. P3HT blends, with two nonfullerene acceptors (O-IDTBR and EH-IDTBR), were probed using a number of polymer batches with varying molecular weights. O-IDTBR was shown to exhibit a dependence on the polymer molecular weight, with optimal performance achieved with a 34 kDa polymer, while EH-IDTBR displayed an independence in performance with varying polymer molecular weight. Probing the thermal and morphological behavior of the P3HT:O-IDTBR blends suggests that an optimal morphology with pronounced donor and acceptor domains was only achieved with the 34 kDa polymer, and a greater degree of mixing was exhibited in the other blends, likely leading to poorer device performance.
Original languageEnglish (US)
Pages (from-to)1801001
JournalAdvanced Energy Materials
Volume8
Issue number28
DOIs
StatePublished - Jun 26 2018

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