In-Depth Study of Ambipolar Charge-Transport Regime through External Triggers and Gas Sensing
Résumé
Ambipolar devices is a hot topic in research's table due to its unique advantage in reducing the size of the electrical system and enhancing its efficiency. Here, we report a bilayer heterojunction device constructed using octafluoro-vanadyl-phthalocyanine (VOF8Pc) and lutetium bisphthalocyanine (LuPc2), which exhibits both p-and n-type behaviors under oxidizing (NO2 and O3) and reducing gas (NH3) species depending on the humidity level and temperature variations. The initial polarity of the device is identified as n-type by measuring a current decrease under oxygen exposure. Most interestingly, we were capable to observe the zero state (no response) where both opposite charge carriers fighting for the majority to dominate the electrical properties of the device when it goes from n-to p-type or vice versa.
The inversion in nature of majority charge carrier densities in this ambipolar device was achieved by optimizing the external trigger. The unique property of controllable polarity inversion in VOF8Pc/LuPc2-based bilayer heterojunction device makes it as a most effective ambipolar device for real world application.
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