Effects of chlorine addition to perovskite-type CH3NH3PbI3 photovoltaic devices

Takeo OKU, Kohei SUZUKI, Atsushi SUZUKI
2016 Journal of the Ceramic Society of Japan  
Effects of PbCl 2 addition to perovskite CH 3 NH 3 PbI 3 precursor solutions on the photovoltaic properties were investigated. TiO 2 / CH 3 NH 3 PbI 3¹x Cl x -based photovoltaic devices were fabricated, and the microstructures of the devices were investigated by X-ray diffraction. The structure analysis indicated phase transformation of the perovskite structure from cubic to tetragonal system by chlorine (Cl)-doping. External and internal quantum efficiencies were improved by a small amount of
more » ... l-doping, which resulted in improvement of the efficiencies of the devices. This would be due to preservation of the cubic CH 3 NH 3 PbI 3¹x Cl x structure, and to expansion of energy gap and diffusion length of exitons by Cl-doping at the iodine sites.
doi:10.2109/jcersj2.15250 fatcat:k3cjsn5ssvbpvdq5vg2zfhgct4