Long-range exciton diffusion in molecular non-fullerene acceptors

Yuliar Firdaus, Vincent M. Le Corre, Safakath Karuthedath, Wenlan Liu, Anastasia Markina, Wentao Huang, Shirsopratim Chattopadhyay, Masrur Morshed Nahid, Mohamad I. Nugraha, Yuanbao Lin, Akmaral Seitkhan, Aniruddha Basu, Weimin Zhang, Iain McCulloch, Harald Ade, John Labram, Frédéric Laquai, Denis Andrienko, L. Jan Anton Koster () and Thomas D. Anthopoulos ()
Additional contact information
Yuliar Firdaus: Material Science and Engineering Program (MSE)
Vincent M. Le Corre: Zernike Institute for Advanced Materials
Safakath Karuthedath: Material Science and Engineering Program (MSE)
Wenlan Liu: Max Planck Institute for Polymer Research
Anastasia Markina: Max Planck Institute for Polymer Research
Wentao Huang: Imperial College London, South Kensington
Shirsopratim Chattopadhyay: Oregon State University
Masrur Morshed Nahid: North Carolina State University
Mohamad I. Nugraha: Material Science and Engineering Program (MSE)
Yuanbao Lin: Material Science and Engineering Program (MSE)
Akmaral Seitkhan: Material Science and Engineering Program (MSE)
Aniruddha Basu: Material Science and Engineering Program (MSE)
Weimin Zhang: Material Science and Engineering Program (MSE)
Iain McCulloch: Material Science and Engineering Program (MSE)
Harald Ade: North Carolina State University
John Labram: Oregon State University
Frédéric Laquai: Material Science and Engineering Program (MSE)
Denis Andrienko: Max Planck Institute for Polymer Research
L. Jan Anton Koster: Zernike Institute for Advanced Materials
Thomas D. Anthopoulos: Material Science and Engineering Program (MSE)

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract The short exciton diffusion length associated with most classical organic semiconductors used in organic photovoltaics (5-20 nm) imposes severe limits on the maximum size of the donor and acceptor domains within the photoactive layer of the cell. Identifying materials that are able to transport excitons over longer distances can help advancing our understanding and lead to solar cells with higher efficiency. Here, we measure the exciton diffusion length in a wide range of nonfullerene acceptor molecules using two different experimental techniques based on photocurrent and ultrafast spectroscopy measurements. The acceptors exhibit balanced ambipolar charge transport and surprisingly long exciton diffusion lengths in the range of 20 to 47 nm. With the aid of quantum-chemical calculations, we are able to rationalize the exciton dynamics and draw basic chemical design rules, particularly on the importance of the end-group substituent on the crystal packing of nonfullerene acceptors.

Date: 2020
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DOI: 10.1038/s41467-020-19029-9

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