title: High efficiency solid-state sensitized solar cell-based on submicrometer rutile TiO2 nanorod and CH3NH3PbI3 perovskite sensitizer.
abstract: We report a highly efficient solar cell based on a submicrometer (~0.6 μm) rutile TiO2 nanorod sensitized with CH3NH3PbI3 perovskite nanodots. Rutile nanorods were grown hydrothermally and their lengths were varied through the control of the reaction time. Infiltration of spiro-MeOTAD hole transport material into the perovskite-sensitized nanorod films demonstrated photocurrent density of 15.6 mA/cm(2), voltage of 955 mV, and fill factor of 0.63, leading to a power conversion efficiency (PCE) of 9.4% under the simulated AM 1.5G one sun illumination. Photovoltaic performance was significantly dependent on the length of the nanorods, where both photocurrent and voltage decreased with increasing nanorod lengths. A continuous drop of voltage with increasing nanorod length correlated with charge generation efficiency rather than recombination kinetics with impedance spectroscopic characterization displaying similar recombination regardless of the nanorod length.
authors.affiliation: School of Chemical Engineering and Department of Energy Science, Sungkyunkwan University, Suwon 440-746, Korea.
authors.forename: Hui-Seon
authors.initials: HS
authors.lastname: Kim
authors.forename: Jin-Wook
authors.initials: JW
authors.lastname: Lee
authors.forename: Natalia
authors.initials: N
authors.lastname: Yantara
authors.forename: Pablo P
authors.initials: PP
authors.lastname: Boix
authors.forename: Sneha A
authors.initials: SA
authors.lastname: Kulkarni
authors.forename: Subodh
authors.initials: S
authors.lastname: Mhaisalkar
authors.forename: Michael
authors.initials: M
authors.lastname: Grätzel
authors.forename: Nam-Gyu
authors.initials: NG
authors.lastname: Park