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