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Chemical Institute has made a series of progress in large-area organic photovoltaic materials and devices
[ Instrument Network Instrument R & D ] Organic photovoltaic cells (OPVs) have outstanding advantages such as light weight, simple manufacturing process, and large-area flexible devices that can be prepared by low-cost printing processes, and show broad application prospects. With the dramatic improvement of photovoltaic efficiency, the OPV field has developed to a critical stage of transition from laboratory to industrialization. How to further promote the improvement of photovoltaic efficiency and solve the key problems faced in large-scale preparation at the same time is the focus of current research.
With the support of the Beijing National Research Center for Molecular Sciences, the National Natural Science Foundation of China, and the Ministry of Science and Technology, the team of Hou Jianhui from the Polymer Physics and Chemistry Laboratory of the Institute of Chemistry of the Chinese Academy of Sciences carried out a series of researches on the preparation of key materials and devices for large-scale OPV batteries. Aiming at large-area processing technology, the coating and processing methods of active layer and interface layer (Adv. Mater. 2018, 30, 1704837; Adv. Mater. 2019, 31; 1903441; Joule 2019, 3, 1) have been studied for photovoltaic performance. Influence, the cells prepared by the coating printing method achieved excellent photovoltaic efficiency (Adv. Mater. 2019, 31, 1808356).
Recently, based on the combination of polymer donor material PBDB-T-2Cl and a novel non-fullerene acceptor Y6, the team achieved a photovoltaic efficiency of 14.3% in a cell with a thickness of 300 nm (Sci. China Chem. 2020, 63, 21), which proves that the system has good film thickness tolerance, which is very beneficial for large-area coating processing. By further modifying the end group of the acceptor material and optimizing the alkyl chain, the researchers prepared BTP-4Cl-12 with low energy loss and good processability; based on this material, the team prepared a small area using spin coating ( 0.09 cm2) cells achieve photovoltaic efficiency up to 17%. The 1 cm2 battery prepared by the doctor blade coating method can still maintain 15.5% of the PCE, which is the highest result achieved by an OPV battery of the same large area. It has initially demonstrated the application potential of such high-efficiency material systems. Related research work was published in the recent National Science Review. The corresponding author is Yao Huifeng and the first author is Cui Yong.