Surface recrystallized stable 2D–3D graded perovskite solar cells for efficiency beyond 21%

Abstract

Recently, organic-inorganic hybrid perovskite solar cells (PSCs) have experienced a rapid growth in terms of efficiency. However, the instability of hybrid perovskite materials towards ambient conditions restricts its commercialization. Formation...

Efficient MA-free perovskite solar cells with balanced carrier transport achieved using 4-trifluorophenylammonium iodide

“…In addition, the 2D/3D device exhibits a much smaller hysteresis index of 0.044, dened as (PCE reverse À PCE forward )/PCE reverse , 50 than that of the control one with 0.085, implying that the 2D layer atop the 3D perovskite can effectively passivate interfacial defects and suppress ion migration. 7,9,51 The corresponding external quantum efficiency (EQE) spectra were measured with the integrated J SC of 23.2 mA cm À2 for the control and 23.4 mA cm À2 for the 2D/3D device, which well-matched with those from the J-V measurement (Fig. S8, ESI †).…”

“…1a schematically depicts the Cs/FA-based device with the conguration of glass/uorine-doped tin oxide (FTO)/TiO 2 / Cs 0.15 FA 0.85 Pb(I 0.95 Br 0.03 Cl 0.02 ) 3 /2,2 0 ,7,7 0 -tetrakis-(N,N-di-pmethoxyphenyl-amine)-9,9 0 -spirobiuorene (spiro-OMeTAD)/ Au, in which the perovskite lm prepared via a typical onestep antisolvent method. 35 To form the 2D/3D junction, TFPAI was dissolved in isopropanol (IPA) at different concentrations (5,7,9,11, and 13 mg mL À1 , marked as TFPAI-5, 7, 9, 11, and 13, respectively) were deposited onto the as-prepared MA-free perovskite lms. Fourier transform infrared (FTIR) spectra of TFPAI, the control lm, and the TFPAI-treated sample are shown in Fig.…”

“…Organic–inorganic hybrid perovskite materials have witnessed great development over the past decade in the field of thin-film solar cells, 1–11 and the certificated power conversion efficiency (PCE) of perovskite solar cells (PSCs) has skyrocketed to 25.5%. 12 Currently, MA-containing perovskite materials are the most established and highly-efficient PSCs, whereas the MA + -containing perovskite materials are usually unstable under thermal aging and would decompose at high temperatures ( e.g.…”

Realizing High‐Efficiency Perovskite Solar Cells by Passivating Triple‐Cation Perovskite Films

“…This shows that the KTN5passivated film has good hydrophobicity, which can effectively prevent moisture from entering the perovskite film, thereby effectively improving the stability of the device. [43,44] To further investigate the effect of KTN5 passivation on the optoelectronic quality of the perovskite/spiro-OMeTAD films, photoluminescence and time-resolved photoluminescence (TRPL) measurements were performed, and the results are shown in Figure 4a,b. The PL quenching efficiency of the KTN5-passivated perovskite film is much higher than that of the control perovskite film, presenting higher hole transfer efficiency and the reduction of charge recombination.…”

“…This shows that the KTN5‐passivated film has good hydrophobicity, which can effectively prevent moisture from entering the perovskite film, thereby effectively improving the stability of the device. [ 43,44 ]…”