Personne : Leclerc, Mario
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Université Laval. Département de chimie
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- PublicationAccès libreFused benzothiadiazole : a building block for n-type organic acceptor to achieve high-performance organic solar cells(Wiley, 2019-03-18) Yuan, Jun; Mainville, Mathieu; Zhang, Yunqiang; Beaupré, Serge; Zhou, Liuyang; Johnson, Paul A.; Zhang, Chujun; Leclerc, Mario; Lau, Tsz-Ki; Zhang, Guichuan; Yip, Hin-Lap; So, Shu Kong; Chen, Honggang; Li, Yongfang; Zou, YingpingNarrow bandgap n-type organic semiconductors (n-OS) have attracted great attention in recent years as acceptors in organic solar cells (OSCs), due to their easily tuned absorption and electronic energy levels in comparison with fullerene acceptors. Herein, a new n-OS acceptor, Y5, with an electron-deficient-core-based fused structure is designed and synthesized, which exhibits a strong absorption in the 600–900 nm region with an extinction coefficient of 1.24 × 105 cm−1, and an electron mobility of 2.11 × 10−4 cm2 V−1 s−1. By blending Y5 with three types of common medium-bandgap polymers (J61, PBDB-T, and TTFQx-T1) as donors, all devices exhibit high short-circuit current densities over 20 mA cm−2. As a result, the power conversion efficiency of the Y5-based OSCs with J61, TTFQx-T1, and PBDB-T reaches 11.0%, 13.1%, and 14.1%, respectively. This indicates that Y5 is a universal and highly efficient n-OS acceptor for applications in organic solar cells.
- PublicationAccès libreSingle-junction organic solar cell with over 15% efficiency using fused-ring acceptor with electron-deficient core-based fused-ring N-type organic semiconductor as acceptor(ScienceDirect, 2019-01-17) Yuan, Yuan; Johnson, Paul A.; Zhang, Yunqiang; Leclerc, Mario; Zhou, Liuyang; Zhang, Guichuan; Lau, Tsz-Ki; Lu, Xinhui; Peng, Hongjian; Li, Yongfang; Yip, Hin-Lap; Cao, Yong; Ulanski, Jacek; Zou, YingpingRecently, non-fullerene n-type organic semiconductors have attracted significant attention as acceptors in organic photovoltaics (OPVs) due to their great potential to realize high-power conversion efficiencies. The rational design of the central fused ring unit of these acceptor molecules is crucial to maximize device performance. Here, we report a new class of non-fullerene acceptor, Y6, that employs a ladder-type electron-deficient-core-based central fused ring (dithienothiophen[3.2-b]- pyrrolobenzothiadiazole) with a benzothiadiazole (BT) core to fine-tune its absorption and electron affinity. OPVs made from Y6 in conventional and inverted architectures each exhibited a high efficiency of 15.7%, measured in two separate labs. Inverted device structures were certified at Enli Tech Laboratory demonstrated an efficiency of 14.9%. We further observed that the Y6-based devices maintain a high efficiency of 13.6% with an active layer thickness of 300 nm. The electron-deficient-core-based fused ring reported in this work opens a new door in the molecular design of high-performance acceptors for OPVs.
- PublicationAccès libreRecent progress on indoor organic photovoltaics : from molecular design to production scale(American Chemical Society, 2020-03-10) Mainville, Mathieu; Leclerc, MarioRecently, indoor photovoltaics have attracted much interest for their ability to power small electronic devices and sensors, especially with the growth of the internet of things (IoT). Because of their absorption covering ambient emission spectra and tunable electronic structures, π-conjugated polymers and small molecules are well-suited for these applications. Among many benefits, including their ink processability, low weight, and flexibility, indoor organic photovoltaics (IOPVs) show power conversion efficiencies (PCEs) over 26%. This represents a power output of over 30 μW cm–2 under office light (500 lx), which is sufficient to operate many electronic devices and sensors with a relatively small photovoltaic area. This Focus Review highlights the major advances in the material design for IOPVs and includes some industrial insights to reach the production scale criteria.