Proceedings of nanoGe Fall Meeting 2018 (NFM18)
Publication date: 6th July 2018
MAPI (methylammonium lead iodide) based solar cells with inverted architecture were fabricated employing a compact layer of transparent NiO as hole transport system. The conditions of MAPI deposition as well as the choice of Ni precursor were optimized in order to achieve an improvement of the overall photoconversion efficiency (PCE) in the resulting device. An important aspect of the optimized procedure here considered for the spin-coating deposition of the different functional layers that constitute the hybrid solar cell is the conduction of the deposition in ambient conditions. In particular, for the optimization of the deposition of the hole transport layer (HTL) we have considered four different salts/precursors of Ni(II) that differed for the nature of the anion and for the concentration in the mixture of reaction. The nickel-containing sol was stabilized with bulky alcohols and strong inorganic acids. The electron selective contact was constituted by spin coated 3′H-cyclopropa[1,9] [5,6]fullerene-C60-Ih-3′-butanoic acid 3′-phenyl methyl ester (PCBM) with 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (bathocuproine, BCP) as interlayer for the amelioration of the electron transfer process through BCP/PCBM interface. The inverted PSCs here considered with NiO as HTL could reach PCE values as high as 16.6 % when NiCl2 was the precursor. Moreover, the best performing solar cell displayed an excellent time stability in correspondence of the point of maximum power output being JMP and VMP 19.5 mA cm-2 and 0.82 V, respectively.
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