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@ARTICLE{Kikobo:904168,
      author       = {Kikobo, Gracia Loma and Kumar, Abhishek and Vibhu, Vaibhav
                      and Ouedraogo, Seydou and Deshotel, Alix and Mateos,
                      Mickaël and Meunier-Prest, Rita and Bouvet, Marcel},
      title        = {{P}hoton assisted-inversion of majority charge carriers in
                      molecular semiconductor-based organic heterojunctions},
      journal      = {Journal of materials chemistry / C},
      volume       = {9},
      number       = {14},
      issn         = {2050-7526},
      address      = {London ˜[u.a.]œ},
      publisher    = {RSC},
      reportid     = {FZJ-2021-05738},
      pages        = {5008 - 5020},
      year         = {2021},
      abstract     = {Ambipolar molecular materials hold great promise as a
                      building block of next generation highly efficient, less
                      complex and low cost electronic devices. In this endeavor,
                      the present work reports the fabrication of organic
                      heterojunction devices based on halogenated copper
                      phthalocyanine (CuPc) and lutetium bisphthalocyanine (LuPc2)
                      bilayers, investigates their structural and electrical
                      properties and probes the ambipolar behavior by ammonia
                      sensing. Microstructural analysis of the heterostructure
                      thin films revealed compact and semicrystalline
                      organization, depending on the number of halogen
                      substituents in CuPc. The heterojunction devices reveal
                      non-linear I(V) characteristics associated with an
                      interfacial energy barrier which is tuned by the number and
                      type of halogen substituents. The behavior of the devices
                      towards NH3 exposure revealed n-type, p-type and ambipolar
                      transport depending on 16, 0 and 8 fluorine substituents,
                      respectively, present in the CuPc component of the
                      heterostructure, demonstrating a correlation between the
                      electronic effects of substituents and the thin film
                      electrical properties. The trigger of the ambipolar
                      transport regime in the heterojunction device is the visible
                      light, such that the device conduction channel is dominated
                      by holes in the dark and electrons under illumination. In
                      depth charge transport studies by impedance spectroscopy
                      explain the device electrical behavior and highlight the
                      important role played by the interface in the
                      heterostructures. Different charge transport parameters are
                      extracted by fitting the experimental Nyquist curves,
                      analysis of those confirms the presence of bulk and
                      interfacial transport and provides an interpretation of the
                      observed ambipolarity.},
      cin          = {IEK-9},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-9-20110218},
      pnm          = {1232 - Power-based Fuels and Chemicals (POF4-123)},
      pid          = {G:(DE-HGF)POF4-1232},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000635685400001},
      doi          = {10.1039/D0TC05828A},
      url          = {https://juser.fz-juelich.de/record/904168},
}