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Green Solvent Processable, Dopant-Free Hole Transport Materials for Ro…

Year of publication
Title of paper
Green Solvent Processable, Dopant-Free Hole Transport Materials for Robust and Efficient Perovskite Solar Cells
Author
[박태호교수 연구실]
Publication in journal
Journal of The American Chemical Society 2017, 139 (35), pp 12175–12181
Publication date
20170816
 
[abstract]
In addition to having proper energy levels and high hole mobility (μh) without the use of dopants, holetransporting materials (HTMs) used in n-i-p-type perovskite solar cells (PSCs) should be processed using green solvents to enable environmentally friendly device fabrication. Although many HTMs have been assessed, due to the limited solubility of HTMs in green solvents, no green-solvent-processable HTM has been reported to date. Here, we report on a greensolvent-processable HTM, an asymmetric DA polymer (asy-PBTBDT) that exhibits superior solubility even in the green solvent, 2-methylanisole, which is a known food additive. The new HTM is well matched with perovskites in terms of energy levels and attains a high μh (1.13 × 103 cm2/(V s)) even without the use of dopants. Using the HTM, we produced robust PSCs with 18.3% efficiency (91% retention after 30 days without encapsulation under 50%75% relative humidity) without dopants; with dopants (bis(trifluoromethanesulfonyl) imide and tertbutylpyridine, a 20.0% efficiency was achieved. Therefore, it is a first report for a green-solvent-processable hole-transporting polymer, exhibiting the highest efficiencies reported so far for n-i-p devices with and without the dopants.
 
DOI: 10.1021/jacs.7b04949