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