BaTiO3 BTO Organic photovoltaic cells M Fill factor Anode Adsorption Raman Aluminum-doped zinc oxide Addou Alpha-sexithiophene Planar heterojunction Aniline and thiophene derivatives Thin film B Vapour deposition 4-propylenedioxythiophene TIO2 N-doping Photoemission spectroscopy Interfaces Nanoparticles Planar heterojunctions 2D nanomaterials Band alignment 4-ethylenedioxypyrrole Ftouhi 31P NMR Organic solar cell Anatase Bernède Anode buffer layer PVD Alkali fluoride postdeposition treatments ITO free electrode CIGS ALPHA-AMYLASE Copper Sodium GaSe2 Band-gap Ambipolar material Thin films A Interfaces Photoluminescence Arzel Partial shading Thin-film solar cells J-C Buffer layers Solar cells Alternative buffers Molybdenum oxide A Band diagram Band gap gradient Surface morphology CuIn Bond valence excess Copper indium gallium selenide XPS ADDITIVE E171 Active layers H Actinide conditioning Photovoltaics Alternative module structure Reverse bias Ambipolar organic layer Tandem solar cells Epitaxy Organic solar cells Characterization Aminofluorene thiophene derivatives Buffer layer A Thin films Bond valence mode ABSORPTION Titanium dioxide Cattin Silicon Electrical properties ADSORPTION X-ray diffraction Absorption E171 Solar cell Back contact Molybdenum trioxide 4-ethylenedioxythiophene Aluminum phthalocyanine chloride CIGSe A Fullerenes ATR-FTIR Lamkaouane Alkali Anatase colloidal solution for printing L Electropolymerization 34-propylenedioxypiyrrole Aqueous colloidal solution