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Lutetium Bis(2,3,9,10,16,17,23,24-octafluorophthalocyanine): From Synthesis to Heterojunction Device
Petr Bečvář1, Stephane Brandès1, Lucas Vachey1
1UMR CNRS 6302, Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB), Université Bourgogne Europe, 9 avenue Alain Savary, Dijon Cedex 21078, France.
Fluorinated lutetium bisphthalocyanine (Lu(F8Pc)2) was synthesized and studied. This novel semiconductor and its heterojunctions with lutetium bisphthalocyanine (LuPc2) show opposite responses to ammonia, offering new insights.
Area of Science:
- Materials Science
- Organic Electronics
- Molecular Semiconductors
Background:
- Lutetium bisphthalocyanine (LuPc2) is a known molecular semiconductor.
- Fluorinated derivatives of LuPc2 are largely unexplored.
- Understanding structure-property relationships in phthalocyanines is crucial for advanced materials.
Purpose of the Study:
- To synthesize and characterize lutetium octafluorosubstituted bisphthalocyanine (Lu(F8Pc)2).
- To evaluate the electrical properties and ammonia response of Lu(F8Pc)2 films.
- To investigate bilayer heterojunctions of Lu(F8Pc)2 and LuPc2.
Main Methods:
- Synthesis of Lu(F8Pc)2 via direct synthesis or from H2F8Pc precursor.
- Characterization using mass spectrometry and optical spectroscopy.
- Fabrication and electrical evaluation of drop-cast films and bilayer heterojunctions.
Main Results:
- Successful synthesis and characterization of Lu(F8Pc)2.
- Lu(F8Pc)2 resistors exhibit a positive response to ammonia.
- Lu(F8Pc)2/LuPc2 heterojunctions show a negative response to ammonia.
Conclusions:
- Lu(F8Pc)2 is a promising molecular semiconductor with distinct electrical properties.
- The fluorination significantly alters the ammonia sensing behavior compared to the non-fluorinated analogue.
- Opposite responses in heterojunctions provide valuable structure-property insights for phthalocyanine-based sensors.
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