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

Hui Chen | Zendy; Jianfei Qu | Zendy; Longzhu Liu | Zendy; Wei Chen | Zendy; Feng He | Zendy

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

Author(s) -

Hui Chen,

Jianfei Qu,

Longzhu Liu,

Wei Chen,

Feng He

Publication year - 2019

Publication title -

the journal of physical chemistry letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.563

H-Index - 203

ISSN - 1948-7185

DOI - 10.1021/acs.jpclett.9b00063

Subject(s) - morphology (biology) , polymer , materials science , chemical engineering , chemistry , biology , composite material , zoology , engineering

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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