Journal
JAPANESE JOURNAL OF APPLIED PHYSICS
Volume 59, Issue 10, Pages -Publisher
IOP Publishing Ltd
DOI: 10.35848/1347-4065/abb8b8
Keywords
Phthalocyanine; organic solar cell; thin film; alkyl substituent
Categories
Funding
- Vietnam National Foundation for Science and Technology Development (NAFOSTED) [103.02-2018.320]
- JSPS KAKENHI [18H04514]
- JSPS Core-to-Core Program A., Advanced Research Networks
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We report alkyl-substituent length dependences of optical and electronic characteristics, crystal structures, and photovoltaic performances of bulk-heterojunction organic solar cells utilizing non-peripherally alkyl-substituted tetrabenzotriazaporphyrin (CnTBTAPH(2)). By extending the pentyl (n= 5) to octyl (n= 8) substituents, the molecular alignment was affected and the intercolumnar packing was probably modified from pseudo-hexagonal structure to 2D rectangular lattice. Furthermore, the devices utilizing the C5TBTAPH(2)and C6TBTAPH(2)discotic macrocycles with the short-alkyl-substituents exhibited a relatively high photovoltaic performance with a power conversion efficiency of around 4.7% in comparison with those utilizing the long-alkyl-substituted macrocycles. These differences in the device performance could be understood by taking the hole mobility and highest occupied molecular orbital energy level into consideration.
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