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