Morphological and physicochemical properties of dip-coated poly {(2,5-diyl pyrrole) [4-nitrobenzylidène]} (PPNB) thin films: towards photovoltaic applicationsYounes Mouchaal, Hamou Gherrass, Abdelkarim Bendoukha Reguig, Aïcha Hachemaoui, Ahmed Yahiaoui, Mohamed Makha, Abdelbacet Khelil and Jean-Christian BernedeEur. Phys. J. Appl. Phys., 69 2 (2015) 20203DOI: https://doi.org/10.1051/epjap/2015140184