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Instruments / Technical Area	Publication Details	Published	Actions
I07-Surface & interface diffraction	Non-fullerene acceptor fibrils enable efficient ternary organic solar cells with 16.6% efficiency Donghui Li , Xiaolong Chen , Jinglong Cai , Wei Li , Mengxue Chen , Yuchao Mao , Baocai Du , Joel A. Smith , Rachel C. Kilbride , Mary E. O'kane , Xue Zhang , Yuan Zhuang , Pang Wang , Hui Wang , Dan Liu , Richard A. L. Jones , David G. Lidzey , Tao Wang Science China Chemistry 6 DOI: 10.1007/s11426-019-9681-8 Diamond Proposal Number(s): [22651] Show Abstract ▼ Abstract: Optimizing the components and morphology within the photoactive layer of organic solar cells (OSCs) can significantly enhance their power conversion efficiency (PCE). A new A-D-A type non-fullerene acceptor IDMIC-4F is designed and synthesized in this work, and is employed as the third component to prepare high performance ternary solar cells. IDMIC-4F can form fibrils after solution casting, and the presence of this fibrillar structure in the PBDB-T-2F:BTP-4F host confines the growth of donors and acceptors into fine domains, as well as acting as transport channels to enhance electron mobility. Single junction ternary devices incorporating 10 wt% IDMIC-4F exhibit enhanced light absorption and balanced carrier mobility, and achieve a maximum PCE of 16.6% compared to 15.7% for the binary device, which is a remarkable efficiency for OSCs reported in literature. This non-fullerene acceptor fibril network strategy is a promising method to improve the photovoltaic performance of ternary OSCs.	Feb 2020
I07-Surface & interface diffraction	13.9% efficiency ternary nonfullerene solar cells featuring low-structural order Baocai Du , Renyong Geng , Wei Li , Donghui Li , Yuchao Mao , Mengxue Chen , Xue Zhang , Joel A. Smith , Rachel C. Kilbride , Mary E. O'kane , Dan Liu , David G. Lidzey , Weihua Tang , Tao Wang Acs Energy Letters DOI: 10.1021/acsenergylett.9b01630 Diamond Proposal Number(s): [22651] Show Abstract ▼ Abstract: The insufficient phase separation between polymer donors and non-fullerene acceptors (NFAs) featuring with low-structural orders disrupts efficient charge transport and increases charge recombination, consequently limits the maximum achievable power conversion efficiency (PCE) of organic solar cells (OSCs). Herein, an NFA IT-M has been added as the third component into the PBDB-T:m-INPOIC OSCs, and is shown to effectively tune the phase separation between donor and acceptor molecules, although all components in the ternary system exhibit low degrees of structural orders. The incorporation of 10 wt% IT-M into a PBDB-T:m-INPOIC binary host blend appreciably increases the length scale of phase separation, creating continuous pathways which increase and balance charge transport. This leads to an enhanced photovoltaic performance from 12.8% in the binary cell to 13.9% for the ternary cell with simultaneously improved open-circuit voltage, short-circuit current and fill factor. This work highlights the beneficial role of ternary components in controlling the morphology of the active layer for high performance OSCs.	Sep 2019

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