Enhanced Planar Perovskite Solar Cell Performance via Contact Passivation of TiO₂/Perovskite Interface with NaCl Doping Approach

Abstract

Perovskite solar cells (PSCs) have been developed rapidly in recent years due to the excellent photoelectric properties and development potential. In this study, high performance and hysteresis-less planar structured perovskite (MA 1−y FA y PbI 3−x Cl x ) solar cell was successfully achieved via contact passivation of the compact titanium dioxide (TiO 2 )/ perovskite interface with NaCl doping method. It was found that the sodium chloride (NaCl) doping treatment on TiO 2 could significantly improve the electrical property of TiO 2 electron transport layer (ETL), and passivate the trap states at TiO 2 / perovskite interface. Moreover, the improved interface contact between TiO 2 ETL and perovskite could efficiently enhance the charge transfer and suppress the charge recombination in the device. Hence, the power conversion efficiency (PCE) of PSC device based on NaCl-doped TiO 2 was enhanced to 18.3% compared with the pristine compact TiO 2 -based PSCs (15.1%).

Beneficial Role of Organolead Halide Perovskite CH3NH3PbI3/SnO2 Interface: Theoretical and Experimental Study

“…The optimized lattice constants of a = b = 4.737 Å and c = 3.185 Å for SnO 2 , and a = b = 8.715 Å and c = 12.835 Å for tetragonal CH 3 NH 3 PbI 3 which are in good agreement with previous reports . To minimize the mismatch between CH 3 NH 3 PbI 3 surface and SnO 2 surface, the CH 3 NH 3 PbI 3 /SnO 2 interfaces, as shown in Figure , were constructed by 1 × 1 supercell CH 3 NH 3 PbI 3 (110), and 2 × 4 supercell SnO 2 (110) surfaces according to previous experimental and theoretical results . The mismatches between CH 3 NH 3 PbI 3 and SnO 2 supercell surfaces were less than 4.29%, as listed in Table 1 .…”

From Bulk to Surface: Sodium Treatment Reduces Recombination at the Nickel Oxide/Perovskite Interface

“…However, different groups demonstrated the potentiality of introducing alkali cation at the perovskite interfaces. For instance, alkali metal halides were successfully implemented at the ESL|PSK interface in n‐i‐p architecture . It was also demonstrated that NaCl can ameliorate the morphology of single‐step deposited CH 3 NH 3 PbI 3 , however we do not observe any sizeable variation in the morphology and in the crystallinity of the perovskite layer (Figures S8 and S17, Supporting Information).…”

Enhancing Perovskite Solar Cell Performance through Surface Engineering of Metal Oxide Electron-Transporting Layer

“…The average lifetimes derived from the fitting curves were around 25.7 and 29.8 ns for perovskite films with and without TiCl 4 treatment, respectively. The decreased PL lifetime is related to the efficient charge carrier transfer induced quenching process [27]. This is essential for efficient charge extraction and collection of the device.…”

“…Hence, various interface transporting layers have been studied. Among them, metal oxides (e.g., ZnO, SnO 2 , and TiO 2 ) have been widely investigated as electron-transporting layers (ETLs) in PSCs [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37], particularly TiO 2 ETL. The surface and electronic properties of TiO 2 play important roles in determining the final device performance, including power conversion efficiency (PCE), hysteresis behavior, and stability [20,38,39].…”