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Title: Robust nonfullerene solar cells approaching unity external quantum efficiency enabled by suppression of geminate recombination
Authors: Tan, Ching Hong 
Gasparini, Nicola
McCulloch, Iain
Durrant, James R.
Brabec, Christoph J.
Hamid, Zeinab 
Song, Xin 
Wadsworth, Andrew 
Baran, Derya
Wehbe, Nimer 
Kirchartz, Thomas 
Neophytou, Marios 
Zhang, Weimin 
Keywords: Organic photovoltaics;Solar cells;Fullerenes
Category: Mechanical Engineering;Materials Engineering
Field: Engineering and Technology
Issue Date: 1-Dec-2018
Source: Nature Communications, Volume 9, Issue 1, 1 December 2018, Article number 2059
Abstract: © 2018 The Author(s). Nonfullerene solar cells have increased their efficiencies up to 13%, yet quantum efficiencies are still limited to 80%. Here we report efficient nonfullerene solar cells with quantum efficiencies approaching unity. This is achieved with overlapping absorption bands of donor and acceptor that increases the photon absorption strength in the range from about 570 to 700 nm, thus, almost all incident photons are absorbed in the active layer. The charges generated are found to dissociate with negligible geminate recombination losses resulting in a short-circuit current density of 20 mA cm -2 along with open-circuit voltages >1 V, which is remarkable for a 1.6 eV bandgap system. Most importantly, the unique nano-morphology of the donor:acceptor blend results in a substantially improved stability under illumination. Understanding the efficient charge separation in nonfullerene acceptors can pave the way to robust and recombination-free organic solar cells.
ISSN: 20411723
DOI: 10.1038/s41467-018-04502-3
Type: Article
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