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Importance of Terminal Group Pairing of Polymer Donor and Small-Molecule Acceptor in Optimizing Blend Morphology and Voltage Loss of High-Performance Solar Cells

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Abstract
As a variety of non-fullerene small molecule acceptors (SMAs) have been developed to improve power conversion efficiency (PCE) of organic solar cells (OSCs), the pairing of the SMAs with optimal polymer donors (PDs) is an important issue. Herein, a systematic investigation is conducted with the development of the SMA series, named C6OB-H, C6OB-Me, and C6OB-F, which contain distinctive terminal substituents ?H, ?CH3, and ?F, respectively. These SMAs are paired with two PDs, PBDT-H and PBDT-F. Interestingly, the PD/SMA pairs with similar terminal groups yield enhanced molecular compatibility and energetic interactions, which suppress voltage loss while improving blend morphology to enhance simultaneously the open?circuit voltage, short?circuit current, and fill factor of the OSCs. In particular, the OSC based on the PBDT-F:C6OB-F blend sharing fluorine terminal groups achieves the highest PCE of 15.2%, which outperforms those of PBDT-H:C6OB-F (10.1%) and PBDBF: C6OB-H OSCs (11.2%). Furthermore, the PBDT-F:C6OB-F OSC maintains high PCEs with active layer thicknesses between 85 and 310 nm. In contrast, the PCE of PBDT-H:C6OB-F-based OSC already drops by 80% from 10.1% to 2.1% when the active layer thickness increases from 100 to 200 nm. This study establishes an important PD/SMA pairing rule in terms of terminal functional groups for achieving high-performance OSC.
Author(s)
Geon-U KimCheng SunJin Su ParkHyun Gyeong Lee이동찬Jin-Woo LeeHyeong Jun Kim조신욱Yun-Hi KimSoon-Ki KwonBumjoon J. Kim
Issued Date
2021
Type
Article
Keyword
blend morphologiesmolecular compatibilitynon-fullerene organic solar cellsterminal group pairingvoltage loss
DOI
10.1002/adfm.202100870
URI
https://oak.ulsan.ac.kr/handle/2021.oak/8977
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_gale_infotracacademiconefile_A664707348&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,Importance%20of%20Terminal%20Group%20Pairing%20of%20Polymer%20Donor%20and%20Small-Molecule%20Acceptor%20in%20Optimizing%20Blend%20Morphology%20and%20Voltage%20Loss%20of%20High-Performance%20Solar%20Cells&offset=0&pcAvailability=true
Publisher
ADVANCED FUNCTIONAL MATERIALS
Location
독일
Language
영어
ISSN
1616-301X
Citation Volume
31
Citation Number
24
Citation Start Page
2100870
Citation End Page
2100870
Appears in Collections:
Engineering > Material Engineering
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