Enhancing exciton diffusion by reducing energy disorder in organic solar cells

Xue, Peiyao; Calascibetta, Adiel M.; Chen, Kai; Thorn, Karen E.; Jiang, Yiting; Shi, Jiangjian; Jia, Boyu; Li, Mengyang; Xin, Jingming; Cai, Guilong; Yang, Rui; Lu, Heng; Mattiello, Sara; Liu, Yao; Tang, Zheng; Ma, Wei; Lu, Xinhui; Meng, Qingbo; Hodgkiss, Justin M.; Beverina, Luca; Han, Ray S.; Zhan, Xiaowei

doi:10.1039/d2ta07113d

Enhancing exciton diffusion by reducing energy disorder in organic solar cells

Journal Article · Fri Oct 21 00:00:00 EDT 2022 · Journal of Materials Chemistry. A

DOI:https://doi.org/10.1039/d2ta07113d· OSTI ID:2422680

Xue, Peiyao ^[1]; Calascibetta, Adiel M. ^[2]; Chen, Kai ^[3]; Thorn, Karen E. ^[3]; Jiang, Yiting ^[1]; Shi, Jiangjian ^[4]; Jia, Boyu ^[1]; Li, Mengyang ^[5]; Xin, Jingming ^[6]; ^[7]; Yang, Rui ^[8]; Lu, Heng ^[1]; ^[2]; ^[8]; ^[5]; Ma, Wei ^[6]; Lu, Xinhui ^[7]; Meng, Qingbo ^[4]; ^[3]; ^[2] more »

Peking Univ., Beijing (China)
State University of Milano-Bicocca (Italy)
Victoria Univ. of Wellington (New Zealand)
Chinese Academy of Sciences (CAS), Beijing (China)
Donghua University (China)
Xi'an Jiaotong Univ. (China)
The Chinese University of Hong Kong (Hong Kong)
Beijing University of Chemical Technology (China)
Jiangxi University of Chinese Medicine (China)
Peking Univ., Beijing (China); Northwest Normal University (China)

A highly crystalline, highly emissive, and wide-bandgap polymer AC174 with an extremely small Stokes shift is designed and synthesized in water, and is used to reduce system energetic disorder and increase the exciton diffusion length of the classical PM6:Y6 blend system. AC174 is incompatible with PM6 and Y6, improves molecular packing, and reduces system energetic disorder. The long-range Förster resonance energy transfer between the donor and acceptor is enhanced, and the exciton diffusion constant and exciton lifetime are increased, leading to a longer exciton diffusion length and more efficient exciton dissociation and charge generation. The addition of AC174 simultaneously improves the open-circuit voltage, short-circuit current density (J_SC) and fill factor of PM6:Y6 devices; especially the highest internal quantum efficiency approaches 100%, and the highest J_SC is 28.4 mA cm^–2. Ternary devices with 5% AC174 in the donors achieve a power conversion efficiency of 17.2%, higher than those of the parent binary devices based on PM6:Y6 (15.9%) and AC174:Y6 (3.24%).

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2422680

Alternate ID(s):: OSTI ID: 1897317

Journal Information:: Journal of Materials Chemistry. A, Journal Name: Journal of Materials Chemistry. A Journal Issue: 45 Vol. 10; ISSN 2050-7488

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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