19.32% Efficiency Polymer Solar Cells Enabled by Fine-Tuning Stacking Modes of Y-Type Molecule Acceptors: Synergistic Bromine and Fluorine Substitution of the End Groups

Deng, Min; Xu, Xiaopeng; Duan, Yuwei; Qiu, Wuke; Yu, Liyang; Li, Ruipeng; Peng, Qiang

doi:10.1002/adma.202308216

19.32% Efficiency Polymer Solar Cells Enabled by Fine-Tuning Stacking Modes of Y-Type Molecule Acceptors: Synergistic Bromine and Fluorine Substitution of the End Groups

Journal Article · Fri Dec 15 00:00:00 EST 2023 · Advanced Materials

DOI:https://doi.org/10.1002/adma.202308216· OSTI ID:2446646

Deng, Min ^[1]; Xu, Xiaopeng ^[2]; Duan, Yuwei ^[3]; Qiu, Wuke ^[2]; Yu, Liyang ^[4]; Li, Ruipeng ^[5]; ^[4]

Chengdu University of Technology (China)
Sichuan Univ., Chengdu (China)
Shaanxi Normal University, Xi'an (China)
Chengdu University of Technology (China); Sichuan Univ., Chengdu (China)
Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)

Here, the success of Y6-type nonfullerene small molecule acceptors (NF-SMAs) in polymer solar cells (PSCs) can be attributed to their unique honeycomb stacking style, which leads to favorable thin-film morphologies. The intermolecular interactions related to the crystallization tendency of these NF-SMAs is closely governed by their electron accepting end groups. For example, the high performance Y6 derivative L8-BO (BTP-4F) presents three types of stacking modes in contrast to two stacking modes of Y6. Hence, it is ultimately interesting to obtain more insight on the packing properties and the preferences influenced by chemical modifications such as end group engineering. This work designs and synthesizes asymmetric and symmetric L8-BO derivatives with brominated end groups and explores the stacking preferences in various modes. The asymmetric BTP-3FBr displays an optimized crystallization tendency and thin film morphology, leading to a decent power conversion efficiency (PCE) of 18.34% in binary devices and a top PCE of 19.32% in ternary devices containing 15 wt% IDIC as the second acceptor.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 2446646

Report Number(s):: BNL--226110-2024-JAAM

Journal Information:: Advanced Materials, Journal Name: Advanced Materials Journal Issue: 11 Vol. 36; ISSN 0935-9648

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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