@article{cd2fb8ec598a46729534e3eb9723b4ed,
title = "Simultaneously Enhancing Exciton/Charge Transport in Organic Solar Cells by an Organoboron Additive",
abstract = "Efficient exciton diffusion and charge transport play a vital role in advancing the power conversion efficiency (PCE) of organic solar cells (OSCs). Here, a facile strategy is presented to simultaneously enhance exciton/charge transport of the widely studied PM6:Y6-based OSCs by employing highly emissive trans-bis(dimesitylboron)stilbene (BBS) as a solid additive. BBS transforms the emissive sites from a more H-type aggregate into a more J-type aggregate, which benefits the resonance energy transfer for PM6 exciton diffusion and energy transfer from PM6 to Y6. Transient gated photoluminescence spectroscopy measurements indicate that addition of BBS improves the exciton diffusion coefficient of PM6 and the dissociation of PM6 excitons in the PM6:Y6:BBS film. Transient absorption spectroscopy measurements confirm faster charge generation in PM6:Y6:BBS. Moreover, BBS helps improve Y6 crystallization, and current-sensing atomic force microscopy characterization reveals an improved charge-carrier diffusion length in PM6:Y6:BBS. Owing to the enhanced exciton diffusion, exciton dissociation, charge generation, and charge transport, as well as reduced charge recombination and energy loss, a higher PCE of 17.6% with simultaneously improved open-circuit voltage, short-circuit current density, and fill factor is achieved for the PM6:Y6:BBS devices compared to the devices without BBS (16.2%).",
keywords = "charge transport, exciton diffusion, fused-ring electron acceptors, organic solar cells, organoboron",
author = "Heng Lu and Kai Chen and Bobba, {Raja Sekhar} and Jiangjian Shi and Mengyang Li and Yilin Wang and Jingwei Xue and Peiyao Xue and Xiaojian Zheng and Thorn, {Karen E.} and Isabella Wagner and Lin, {Chao Yang} and Yin Song and Wei Ma and Zheng Tang and Qingbo Meng and Quinn Qiao and Hodgkiss, {Justin M.} and Xiaowei Zhan",
note = "Funding Information: X.Z. thanks the NSFC (Nos. U21A20101 and 21734001). J.M.H., K.C., and K.E.T. acknowledge financial support from the Marsden Fund of New Zealand. W.M. thanks the NSFC (21875182). X-ray data was acquired at beamlines 7.3.3 and 11.0.1.2 at the Advanced Light Source, which is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. The authors thank Chenhui Zhu at beamline 7.3.3 and Cheng Wang at beamline 11.0.1.2 for assistance with data acquisition. Q.Q. thanks Abiral Baniya and Sally Mabrouk for the characterization of C-AFM. Y.S. acknowledges support from the NSFC (No. 62105030). Y.S. also thanks Pengcheng Mao at the Analysis & Testing Center, Beijing Institute of Technology and Jiayu Wang, Prof. Yuxiang Weng at Institute of Physics, Chinese Academy of Sciences for their assistance with TA measurements. Funding Information: X.Z. thanks the NSFC (Nos. U21A20101 and 21734001). J.M.H., K.C., and K.E.T. acknowledge financial support from the Marsden Fund of New Zealand. W.M. thanks the NSFC (21875182). X‐ray data was acquired at beamlines 7.3.3 and 11.0.1.2 at the Advanced Light Source, which is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE‐AC02‐05CH11231. The authors thank Chenhui Zhu at beamline 7.3.3 and Cheng Wang at beamline 11.0.1.2 for assistance with data acquisition. Q.Q. thanks Abiral Baniya and Sally Mabrouk for the characterization of C‐AFM. Y.S. acknowledges support from the NSFC (No. 62105030). Y.S. also thanks Pengcheng Mao at the Analysis & Testing Center, Beijing Institute of Technology and Jiayu Wang, Prof. Yuxiang Weng at Institute of Physics, Chinese Academy of Sciences for their assistance with TA measurements. Publisher Copyright: {\textcopyright} 2022 Wiley-VCH GmbH.",
year = "2022",
month = oct,
day = "20",
doi = "10.1002/adma.202205926",
language = "English (US)",
volume = "34",
journal = "Advanced Materials",
issn = "0935-9648",
publisher = "Wiley-VCH Verlag",
number = "42",
}