Carrier Dynamics and Morphology Regulated by 1,8-Diiodooctane in Chlorinated Nonfullerene Polymer Solar Cells

Chen, Hui; Qu, Jianfei; Liu, Longzhu; Chen, Wei; He, Feng

doi:10.1021/acs.jpclett.9b00063

Title: Carrier Dynamics and Morphology Regulated by 1,8-Diiodooctane in Chlorinated Nonfullerene Polymer Solar Cells

Journal Article · Wed Feb 13 00:00:00 EST 2019 · Journal of Physical Chemistry Letters

DOI:https://doi.org/10.1021/acs.jpclett.9b00063· OSTI ID:1505156

Chen, Hui ^[1]; Qu, Jianfei ^[1]; Liu, Longzhu ^[1];

^[2];

^[1]

Southern Univ. of Science and Technology, Shenzhen (China)
Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Chicago, IL (United States)

Very small amounts of 1,8-diiodooctane (DIO) are very effective at optimizing the performance of polymer solar cells (PSCs). To date, the underlying influences are not yet fully understood, especially in nonfullerene PSCs. Herein, the influence of DIO on carrier dynamics and morphology in the PBDBT2Cl:IT4F system was investigated in detail. We combined the characterization of the transient dynamics with the morphology characterization of PSC devices to explore the origin of enhanced performance. Compared to the cast device, the champion device with 0.5% DIO revealed the maximum of current density (J_sc) and fill factor (FF). The optimum DIO content helps to enhance carrier transport and optimize morphology, while excess DIO produces adverse effects due to the induced intense aggregation and dilated size in blend films. The results provide some hints of improved device performance upon using DIO as an additive in nonfullerene PSCs.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

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

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1505156

Journal Information:: Journal of Physical Chemistry Letters, Vol. 10, Issue 5; ISSN 1948-7185

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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Multiple Temporal‐Scale Photocarrier Dynamics Induced by Synergistic Effects of Fluorination and Chlorination in Highly Efficient Nonfullerene Organic Solar Cells Zhang, Kang-Ning; Niu, Meng-Si; Jiang, Zhi-Nan Solar RRL, Vol. 4, Issue 4 https://doi.org/10.1002/solr.202070046	journal	April 2020

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