TY - JOUR
T1 - Long-range exciton diffusion in molecular non-fullerene acceptors
AU - Firdaus, Yuliar
AU - Le Corre, Vincent M.
AU - Karuthedath, Safakath
AU - Liu, Wenlan
AU - Markina, Anastasia
AU - Huang, Wentao
AU - Chattopadhyay, Shirsopratim
AU - Nahid, Masrur Morshed
AU - Nugraha, Mohamad I.
AU - Lin, Yuanbao
AU - Seitkhan, Akmaral
AU - Basu, Aniruddha
AU - Zhang, Weimin
AU - McCulloch, Iain
AU - Ade, Harald
AU - Labram, John
AU - Laquai, Frédéric
AU - Andrienko, Denis
AU - Koster, L. Jan Anton
AU - Anthopoulos, Thomas D.
N1 - Publisher Copyright:
© 2020, The Author(s).
PY - 2020/12/1
Y1 - 2020/12/1
N2 - 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.
AB - 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.
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U2 - 10.1038/s41467-020-19029-9
DO - 10.1038/s41467-020-19029-9
M3 - Article
C2 - 33060574
AN - SCOPUS:85092584343
SN - 2041-1723
VL - 11
JO - Nature communications
JF - Nature communications
IS - 1
M1 - 5220
ER -