Fully printable mesoscopic perovskite solar cells; effect of NiO layer on the device performance

Abstract

Developing low-cost hole transporting materials or hole-conductor free mesoscopic Perovskite solar cells (PSCs) by replacing the noble metal-based counter electrodes with inexpensive and abundantly available materials is a great interest in Photovoltaic industry. Herein, we fabricated fully printable low-cost mesoscopic PSCs with carbon counter electrode using mesoporous TiO2 and NiO layers as electron and hole selective contacts respectively. The influence of NiO layer on the charge transfer processes in printable PSC was studied by the electrochemical impedance spectroscopy. Our study confirmed that the NiO layer promises to greatly enhance the device performance and stability by extracting photo-generated holes efficiently than in a device without the NiO layer.