Nonfullerene acceptors from thieno[3,2-b]thiophene-fused naphthalene donor core with six-member-ring connection for efficient organic solar cellsShow others and affiliations
2021 (English)In: Dyes and pigments, ISSN 0143-7208, E-ISSN 1873-3743, Vol. 185, article id 108892Article in journal (Refereed) Published
Abstract [en]
Comprehensive design ideas on the fused-ring donor-core in state-of-the-art acceptor-donor-acceptor (A-D-A) nonfullerene acceptors (NFAs) are still of great importance for regulating the electron push-pull effect for the sake of optimal light-harvesting, frontier molecular orbital levels, and finally their photovoltaic properties. Herein, thieno[3,2-b]thiophenes were fused in bay-area of naphthalene via six-member-ring connection, resulting in the formation of dihydropyrenobisthieno[3,2-b]thiophene based octacyclic ladder-type donor core, which was flanked by two 1,1-dicyanomethylene-3-indanone (IC) acceptor motifs with and without 5,6-diflourination, namely PTT-IC and PTT-2FIC, respectively, as novel efficient A-D-A fused-ring electron acceptors (FREAs). Compared with PTT-IC, fluorinated PTT-2FIC possesses narrower optical bandgap of 1.48 eV, better pi-pi stacking, and its PBDB-T:PTT-2FIC blend film exhibited better morphology, and better hole and electron mobility. As a result, nonfullerene solar cells using PBDB-T:PTT-2FIC as the active layer achieved a decent PCE of 10.40%, with an open-circuit voltage (V-OC) of 0.87 V, a fill factor (FF) of 0.65, and a much higher short-circuit current (J(SC)) of 18.26 mA/cm(2). Meanwhile, the PBDB-T:PTT-IC cells delivered a lower J(SC) of 12.58 mA/cm(2) but a higher V-OC of 0.99 V, thus resulting in a PCE of 7.39% due to its wider optical bandgap of 1.58 eV and higher LUMO energy level. These results demonstrated that NFAs based on fused-ring donor core from fusing thieno [3,2-b]thiophenes with naphthalene via six-member-ring connection are promising for organic photovoltaic applications.
Place, publisher, year, edition, pages
ELSEVIER SCI LTD , 2021. Vol. 185, article id 108892
Keywords [en]
Organic solar cells; Nonfullerene acceptors; Naphthalene; Six-member-ring; Power conversion efficiency
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:liu:diva-172928DOI: 10.1016/j.dyepig.2020.108892ISI: 000600396400006OAI: oai:DiVA.org:liu-172928DiVA, id: diva2:1522776
Note
Funding Agencies|National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [21604021]; China Scholarship Council (CSC)China Scholarship Council [201808430041, 201708370115, 201808620028]; Hunan Provincial Natural Science FoundationNatural Science Foundation of Hunan Province [2018JJ3141]; School of Materials Science and Engineering, Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications; Knut and Alice Wallenberg FoundationKnut & Alice Wallenberg Foundation [2016.0059]; Swedish Government Research Area in Materials Science on Functional Materials at Linkoping University [SFO-Mat-LiU 200900971]; Sino-Danish Centre for Education and Research (SDC); Hunan Furong Scholarship, China; China Scholarship CouncilChina Scholarship Council [201908440047]; NSFC projectNational Natural Science Foundation of China (NSFC) [11272093]; Guangzhou Municipal Science and Technology Bureau [201804010501, 201904010381]; Department of Education of Guangdong ProvinceNational Natural Science Foundation of Guangdong Province [2018GKTSCX041, 2017GKQNCX005]; Department of Science and Technology of Guangdong Province [2016A010103046]; Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology) [2020-skllmd-07]; Swedish Research CouncilSwedish Research Council [2015-04853, 2016-06146, 2019-04683]; Swedish Research Council FormasSwedish Research CouncilSwedish Research Council Formas; Wallenberg Foundation [2016.0059, 2017.0186]
2021-01-262021-01-262021-03-16