ИСТИНА

Abstract. Thin films of different conductive polymers such as polyaniline (PANI) and poly-3,4-ethylenedioxytiophene (PEDOT) were prepared by electrochemical deposition. Aniline and 3,4-ethylenedioxytiophene eletropolymerization was performed in galvanostatic regime in the presence of sulfonated polyelectrolytes with different structure. Poly-(2-acrylamido-2-methyl-1-propanesulfonic acid) (PAMPSA) and poly(styrene sulfonic acid) (PSSA) and their sodium salts (in case of PEDOT synthesis) were used as polyelectrolytes because of their optical transparency and well film-forming properties. Also they are characterized by high ionic conductivity that allowed performing PANI or PEDOT electropolymerization without supporting electrolyte. It was found that the structure and molecular weight of polyelectrolytes affect kinetics of the synthesis, structure, and morphology of the films obtained. In the case of PEDOT the nature of polyelectrolyte cation is also important. The prepared materials were studied as a hole-transport (buffer) layer (HTL) in hybrid solar cells (HSC). CH3NH3PbI3 layer of perovskite structure served as photoactive layer. We achieved power conversion efficiency of our devices in the range between 8 and 11%. Influence of thickness of HTL, polyelectrolyte structure and molecular weight on HSC volt-ampere characteristics was studied. The investigation of HSC with the obtained polymer complexes as anode buffer layer reveals the importance of the proper choice of polyelectrolyte for the further optimization of HSC performance. This study was supported by the Russian Fund for Basic Research (grants No. 16-29-06423)