Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/81623
Title: Donor Derivative Incorporation : an effective strategy toward high performance all-small-molecule ternary organic solar cells
Authors: Tang, H 
Xu, T
Yan, C 
Gao, J
Yin, H 
Lv, J
Singh, R
Kumar, M
Duan, T
Kan, Z
Lu, S
Li, G 
Keywords: Morphology
Organic solar cells
Small molecules
Structural similarity
Thick films
Issue Date: 2019
Publisher: Wiley-VCH
Source: Advanced science, 2019, 1901613 How to cite?
Journal: Occupational therapy international 
Abstract: Thick-film all-small-molecule (ASM) organic solar cells (OSCs) are preferred for large-scale fabrication with printing techniques due to the distinct advantages of monodispersion, easy purification, and negligible batch-to-batch variation. However, ASM OSCs are typically constrained by the morphology aspect to achieve high efficiency and maintain thick film simultaneously. Specifically, synchronously manipulating crystallinity, domain size, and phase segregation to a suitable level are extremely challenging. Herein, a derivative of benzodithiophene terthiophene rhodanine (BTR) (a successful small molecule donor for thick-film OSCs), namely, BTR-OH, is synthesized with similar chemical structure and absorption but less crystallinity relative to BTR, and is employed as a third component to construct BTR:BTR-OH:PC71BM ternary devices. The power conversion efficiency (PCE) of 10.14% and fill factor (FF) of 74.2% are successfully obtained in ≈300 nm OSC, which outperforms BTR:PC71BM (9.05% and 69.6%) and BTR-OH:PC71BM (8.00% and 65.3%) counterparts, and stands among the top values for thick-film ASM OSCs. The performance enhancement results from the enhanced absorption, suppressed bimolecular/trap–assisted recombination, improved charge extraction, optimized domain size, and suitable crystallinity. These findings demonstrate that the donor derivative featuring similar chemical structure but different crystallinity provides a promising third component guideline for high-performance ternary ASM OSCs.
URI: http://hdl.handle.net/10397/81623
ISSN: 2198-3844
DOI: 10.1002/advs.201901613
Rights: © 2019 The Authors. Published by WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
The following publication Tang, H., Xu, T., Yan, C., Gao, J., Yin, H., Lv, J., ... & Lu, S. (2019). Donor Derivative Incorporation: An Effective Strategy toward High Performance All‐Small‐Molecule Ternary Organic Solar Cells. Advanced Science is available at https://doi.org/10.1002/advs.201901613
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