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

Baran D, Gasparini N, Wadsworth A, Tan CH, Wehbe N, Song X, Hamid Z, Zhang W, Neophytou M, Kirchartz T, Brabec C, Durrant JR, Mcculloch I (2018)

Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2018

Journal

Nature Communications Nature Publishing Group: Nature Communications

Publisher: NATURE PUBLISHING GROUP

Book Volume: 9

Journal Issue: 1

URI: https://www.nature.com/articles/s41467-018-04502-3.pdf

DOI: 10.1038/s41467-018-04502-3

Open Access Link: https://www.nature.com/articles/s41467-018-04502-3.pdf

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.

Authors with CRIS profile

Christoph Brabec Institute Materials for Electronics and Energy Technology (i-MEET)

Involved external institutions

King Abdullah University of Science and Technology (KAUST) / جامعة الملك عبد الله للعلوم و التقنية SA Saudi Arabia (SA) Imperial College London / The Imperial College of Science, Technology and Medicine GB United Kingdom (GB) Forschungszentrum Jülich / Research Centre Jülich (FZJ) DE Germany (DE)

How to cite

APA:

Baran, D., Gasparini, N., Wadsworth, A., Tan, C.H., Wehbe, N., Song, X.,... Mcculloch, I. (2018). Robust nonfullerene solar cells approaching unity external quantum efficiency enabled by suppression of geminate recombination. Nature Communications, 9(1). https://dx.doi.org/10.1038/s41467-018-04502-3

MLA:

Baran, Derya, et al. "Robust nonfullerene solar cells approaching unity external quantum efficiency enabled by suppression of geminate recombination." Nature Communications 9.1 (2018).

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