Issue 2, 2023

N-dopants optimize the utilization of spontaneously formed photocharges in organic solar cells

Abstract

Non-fullerene acceptors (NFAs) not only bring rapid efficiency progress to organic solar cells (OSCs) but have also generated scientific interest in re-evaluating the photocharge generation route via spontaneous or heterojunction-assisted charge separation. Herein, we propose the addition of n-dopants as a strategy to optimize the utilization of spontaneously formed photocharges in NFAs and construct ultralow donor-content dilute bulk heterojunction (BHJ) devices to validate the dopant's roles. N-dopants enhance the transport length of spontaneously formed photocharges over twofold and alleviate the bimolecular recombination with balanced carrier mobility during charge extraction. This improves the photocurrent of ultralow donor-content dilute BHJ devices by over 2.4 times. Moreover, these benefits are successfully conducted to the BHJ devices, and enhancement of conversion efficiencies is observed in both the 100 nm and 400 nm thick OSCs. Our results provide a feasible way to optimize the intrinsic photocharges in NFAs and renew the possibility of efficient single-component OSCs as inorganic photovoltaic techniques.

Graphical abstract: N-dopants optimize the utilization of spontaneously formed photocharges in organic solar cells

Supplementary files

Article information

Article type
Paper
Submitted
08 Nov 2022
Accepted
04 Jan 2023
First published
06 Jan 2023

Energy Environ. Sci., 2023,16, 653-662

Author version available

N-dopants optimize the utilization of spontaneously formed photocharges in organic solar cells

Y. Tang, H. Zheng, X. Zhou, Z. Tang, W. Ma and H. Yan, Energy Environ. Sci., 2023, 16, 653 DOI: 10.1039/D2EE03612F

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