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Title: Reducing the efficiency-stability-cost gap of organic photovoltaics with highly efficient and stable small molecule acceptor ternary solar cells
Authors: Gasparini, Nicola
McCulloch, Iain
Emmott, Christopher J.M. 
Baran, Derya
Hanifi, David A. 
Nelson, Jenny
Lockett, Sarah 
Holliday, Sarah 
Amassian, Aram 
Abdelsamie, Maged 
Ashraf, Raja Shahid 
Röhr, Jason A. 
Durrant, James R.
Brabec, Christoph J.
Salleo, Alberto
Wadsworth, Andrew 
Neophytou, Marios 
Kirchartz, Thomas 
Major Field of Science: Engineering and Technology
Field Category: Mechanical Engineering;Materials Engineering
Keywords: Polymer Solar Cell;Bulk Heterojunction;Organic Photovoltaic
Issue Date: 1-Mar-2017
Source: Nature Materials, 2017, vol. 16, no. 3, pp. 363-369
Volume: 16
Issue: 3
Start page: 363
End page: 369
Journal: Nature materials 
Abstract: ©The Author(s) 2017. Technological deployment of organic photovoltaic modules requires improvements in device light-conversion efficiency and stability while keeping material costs low. Here we demonstrate highly efficient and stable solar cells using a ternary approach, wherein two non-fullerene acceptors are combined with both a scalable and affordable donor polymer, poly(3-hexylthiophene) (P3HT), and a high-efficiency, low-bandgap polymer in a single-layer bulk-heterojunction device. The addition of a strongly absorbing small molecule acceptor into a P3HT-based non-fullerene blend increases the device efficiency up to 7.7 ± 0.1% without any solvent additives. The improvement is assigned to changes in microstructure that reduce charge recombination and increase the photovoltage, and to improved light harvesting across the visible region. The stability of P3HT-based devices in ambient conditions is also significantly improved relative to polymer:fullerene devices. Combined with a low-bandgap donor polymer (PBDTTT-EFT, also known as PCE10), the two mixed acceptors also lead to solar cells with 11.0 ± 0.4% efficiency and a high open-circuit voltage of 1.03 ± 0.01 V.
ISSN: 1476-4660
DOI: 10.1038/nmat4797
Rights: © Macmillan Publishers Limited
Type: Article
Affiliation : University of Duisburg – Essen 
Imperial College London 
King Abdullah University of Science and Technology 
IEK5-Photovoltaics, Forschungszentrum Jülich 
Stanford University 
Friedrich-Alexander University Erlangen-Nuremberg 
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