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Robust nonfullerene solar cells approaching unity external quantum efficiency enabled by suppression of geminate recombination

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Title: Robust nonfullerene solar cells approaching unity external quantum efficiency enabled by suppression of geminate recombination
Authors: Baran, D
Gasparini, N
Wadsworth, A
Tan, CH
Wehbe, N
Song, X
Hamid, Z
Zhang, W
Neophytou, M
Kirchartz, T
Brabec, CJ
Durrant, JR
McCulloch, I
Item Type: Journal Article
Abstract: 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.
Issue Date: 25-May-2018
Date of Acceptance: 15-Apr-2018
URI: http://hdl.handle.net/10044/1/65085
DOI: https://dx.doi.org/10.1038/s41467-018-04502-3
ISSN: 2041-1723
Publisher: Nature Research (part of Springer Nature)
Journal / Book Title: Nature Communications
Volume: 9
Issue: 1
Copyright Statement: © 2018 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Sponsor/Funder: Kaust
Engineering and Physical Sciences Research Council
Funder's Grant Number: CHEDG_P61719
EP/P032591/1
Keywords: Science & Technology
Multidisciplinary Sciences
Science & Technology - Other Topics
FULLERENE ELECTRON-ACCEPTORS
SMALL-MOLECULE ACCEPTOR
ORGANIC PHOTOVOLTAICS
CONJUGATED POLYMERS
CHARGE SEPARATION
FILL FACTOR
GAP
MORPHOLOGY
STABILITY
DESIGN
MD Multidisciplinary
Publication Status: Published
Open Access location: https://www.nature.com/articles/s41467-018-04502-3
Article Number: 2059
Online Publication Date: 2018-05-25
Appears in Collections:Chemistry



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