Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
Dye-sensitized solar cells (DSCs) based on copper(II/I) redox mediators have readily attained high open-circuit voltages (Voc) of over 1 V, but relatively low short-circuit photocurrent densities. To achieve high power conversion efficiency (PCE), the development of extended spectral-response photosensitizers compatible with the copper-based electrolytes while attaining a high Voc is crucial. Herein, a blue photosensitizer coded R7 was reported, which was purposely designed for highly efficient DSCs with copper-based electrolytes. R7 features a strong electron-donating segment of 9,19-dihydrobenzo[1',10']phenanthro[3',4':4,5]thieno[3,2-b]benzo[1,10]phenanthro[3,4-d]thiophene conjugated with an bulky auxiliary donor N-(2',4'-bis(hexyloxy)-[1,1'-biphenyl]-4-yl)-2',4'-bis(hexyloxy)-N-methyl-[1,1'-biphenyl]-4-amine and the electron acceptor 4-(7-ethynylbenzo[c][1,2,5]thiadiazol-4-yl)benzoic acid. The blue dye R7 with bulkier auxiliary donor moiety in the DSC largely outperforms the reference dye R6 with a smaller bis(4-(hexyloxy)phenyl)amine donor unit.[1] Transient absorption spectroscopy and electrochemical impedance spectroscopy measurements show that the R7 based DSC has a higher charge separation yield, a higher charge collection efficiency, and a slower interfacial charge recombination than the R6 based counterpart. A co-sensitized system of R7 and Y123 for the DSC presents an outstanding PCE of 12.7% and maintains 90% of its initial value after 1,000 h of continuous full sunlight soaking at 45 oC. The work sheds light on future designs of organic photosensitizers for highly efficient copper-based DSCs.
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