Perovskite Solar Cells Based on Compact, Smooth FA0.1MA0.9PbI3 Film with Efficiency Exceeding 22%

Abstract

The utilization of mixed cations is beneficial for taking the advantages of cations and achieving highly efficient perovskite solar cells (PSCs). Herein, the precisely small incorporation of CH(NH 2) 2 (FA) cations in methyl ammonium lead iodide (MAPbI 3) enables the formation of compact, smooth perovskite film with high crystallinity. Consequently, the short-circuit current and the fill factor of the PSCs based on FA x MA 1-x PbI 3 perovskite are greatly improved, leading to the enhanced device efficiency. The champion PSC based on FA 0.1 MA 0.9 PbI 3 exhibits a remarkably high efficiency of 22.02%. Furthermore, the PSCs based on FA 0.1 MA 0.9 PbI 3 perovskite also show improved device stability. This work provides a simple approach to fabricate high-quality perovskite films and high-performance PSCs with better stability.

Organic Halide PEACl for Surface Passivation and Defects Suppression in Perovskite Solar Cells

“…These film samples show almost the same absorption onset at 750 nm, and the corresponding optical bandgap is determined to be 1.56 eV according to the Tauc plots shown in Figure 4d. 2,34 The PSCs based on FA 0.1 MA 0.9 PbI 3 were constructed with an ITO/SnO 2 /perovskite/Spiro-OMeTAD/Au structure. The current−voltage (J-V) characteristics of the devices measured under a standard solar illumination at AM 1.5G (100 mW cm −2 ) are shown in Figure 5a.…”

“…The TRPL curves can be fitted with the biexponential function of time t in which τ 1 and τ 2 are the time constants of fast and slow decay progressions, respectively. The fast decay τ 1 symbolizes the surface recombination, while the slow decay is associated with the recombination that takes place in the bulk of the perovskite structure. − All the fitted TRPL components for standard and PEACl-treated perovskite samples are summarized in Table . Correspondingly, the average recombination lifetime (τ ave ) of each perovskite layer was determined approximately using the fitted curve data according to the formula of ref . …”

Semitransparent Perovskite Solar Cells for Building Integration and Tandem Photovoltaics: Design Strategies and Challenges

“…Numerous other reports of (MA) x (FA) 1− x PbI 3 ‐based devices with respectful PCEs have been documented during the last years. [ 47–50 ] At present, there is an increasing interest in more complex, cesium‐containing, triple‐cation (Cs/MA/FA) perovskite compositions, which have recently shown impressive PCEs exceeding 20% and very stable performances against the long‐term exposure to ambient atmosphere. [ 51–55 ] The incorporation of Cs apparently reduces the trap density and charge recombination rates in the perovskite film, making it more thermally stable and less sensitive to processing conditions.…”

Formamidinium post‐dripping on methylammonium lead iodide to achieve stable and efficient perovskite solar cells

“…20,21 Compared with mono cation perovskite, a mix-cation perovskite has been raised as a prominent strategy to improve stability and boost the PCE so far, owing to its controlled stoichiometric ratios. 22 The length and long-term stability of the electron-hole dispersion is noted in FAPbI 3 films compared to MAPbI 3 . In comparison, FAPbI 3 has two crystal structures, which comprise the influence of the temperatures of the synthesis, trigonal structures (perovskite phase, black color, α-FAPbI 3 ), hexagonal structure (non-perovskite phase, yellow color α-FAPbI 3.…”

“…Until now, the addition to the perovskite matrix of more than one additional anion or cation is one method of increasing PCE or enhancing phase stability. [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] The perovskites with mixed-cation have proven to be a powerful and versatile method. It makes it possible to fine-tune the compound band difference with a direct effect on the engineering of tandem solar cells.…”