Additive Engineering for Efficient and Stable MAPbI₃-Perovskite Solar Cells with an Efficiency of over 21%

Abstract

The high density of defects in MAPbI3 perovskite films brings about severe carrier nonradiative recombination loss, which lowers the performance of MAPbI3-based perovskite solar cells (PSCs). Here, methylamine cyanate (MAOCN) molecules were introduced into MAPbI3 solutions to manipulate the crystallizatsion of the MAPbI3 films. MAOCN molecules can slow down the volatilization rate of the solvent and delay the crystallization process of the MAPbI3 film. The crystal quality of the MAPbI3 films is effectively optimized without an additive residue. Perovskite films treated by MAOCN have lower defect density and longer carrier lifetime, which lowers the carrier recombination loss. Meanwhile, the MAPbI3 film based on MAOCN has a more hydrophobic surface. The final MAPbI3-based device efficiency reached 21.28% (V OC = 1.126 V, J SC = 23.29 mA/cm2, and FF = 81.13). After 30 days of storage under atmospheric conditions, the efficiency of unencapsulated MAOCN-based PSCs only dropped by about 5%.

F-Type Pseudo-Halide Anions for High-Efficiency and Stable Wide-Band-Gap Inverted Perovskite Solar Cells with Fill Factor Exceeding 84%

“…This indicates that the F-type pseudo-halogen additives help the crystallization of the perovskite film, resulting in a larger grain size and a more uniform and smooth film. The gradually increasing (001) peak intensity and decreasing full width at half-maximum (fwhm) in Figure S1 and Table S1 further demonstrate that the perovskite films with the F-type pseudo-halogen additives have higher crystallinity and larger grain size Figure S2a–c show atomic force microscopy (AFM) images of the perovskite films.…”

A facile strategy to adjust SnO2/perovskite interfacial properties for high-efficiency perovskite solar cells

“…One should refer to our previous reports for relevant experimental details. 27,28 For the semitransparent perovskite solar cell, the MoOx layer was thermally evaporated on the HTL layer in a vacuum chamber. Then the ITO was deposited by sputtering deposition at room temperature with a radiofrequency power of 70 W. Finally, the Ag metal grid was thermally evaporated on the ITO film.…”

“…All the materials and solvents were purchased from Advanced Election Technology Co. Ltd, Alfa Aesar, Xi’an Polymer Light Technology Corp and Sigma-Aldrich. 27,28…”

Configuration of Methylammonium Lead Iodide Perovskite Solar Cell and its Effect on the Device's Performance: A Review

“…Moreover, they reported the hydrophobic nature of the MAOCN treated perovskite films. [197] Other ETLs: In search of novel organic ETL, Gu et al used 10,14-bis(5-(2-ethylhexyl)thiophen-2-yl)-dipyrido[3,2-a:2′,3′-c] [1,2,5]thiadiazolo [3,4-i]phenazine (TDTP) as ETL for inverted MAPbI 3 based PSCs and achieved a PCE of 18.2%. [198] Subsequently, Zhao et al reported hexaazatrinaphthylene (HATNA) derivatives as efficient ETL for MAPbI 3 based PSCs.…”