Suppressing Defects‐Induced Nonradiative Recombination for Efficient Perovskite Solar Cells through Green Antisolvent Engineering

Abstract

Organic–inorganic hybrid perovskites have attracted considerable attention due to their superior optoelectronic properties. Traditional one‐step solution‐processed perovskites often suffer from defects‐induced nonradiative recombination, which significantly hinders the improvement of device performance. Herein, treatment with green antisolvents for achieving high‐quality perovskite films is reported. Compared to defects‐filled ones, perovskite films by antisolvent treatment using methylamine bromide (MABr) in ethanol (MABr‐Eth) not only enhances the resultant perovskite crystallinity with large grain size, but also passivates the surface defects. In this case, the engineering of MABr‐Eth‐treated perovskites suppressing defects‐induced nonradiative recombination in perovskite solar cells (PSCs) is demonstrated. As a result, the fabricated inverted planar heterojunction device of ITO/PTAA/Cs0.15FA0.85PbI3/PC61BM/Phen‐NADPO/Ag exhibits the best power conversion efficiency of 21.53%. Furthermore, the corresponding PSCs possess a better storage and light‐soaking stability.

Electron-Beam Irradiation Induced Regulation of Surface Defects in Lead Halide Perovskite Thin Films

“…In this study, considering the soft ionic nature of MAPI films, various defects such as point defects (i.e., vacancies, interstitials, and antisites) and two-dimensional defects (grain boundaries) are generated unavoidably due to the fast annealing crystallization process and solution-processed stoichiometric issues [ 57 ]. Moreover, the trap states are 1-2 orders of magnitude greater than that of the film interior [ 58 ]. We calculated the activation energies for the displacement of halide ions on MAPI surfaces with and without halide vacancies ( V I ).…”

Assessing the Impact of Ambient Fabrication Temperature on the Performance of Planar CH3NH3PbI3 Perovskite Solar Cells

“…Efficient non-radiative recombination may additionally lead to a significant deterioration of the solar cell's stability, which is an important factor for their industrialization. [43,44] The electroluminescence of the solar cells prepared at different ambient temperatures was measured and is reported in Figure 7. Radiative emission was observed between the red and near infrared range with a λ max at ca.…”

“…They impact the open circuit voltage ( V oc ), short circuit current ( J sc ) and fill factor ( FF ), which results in a decrease of the overall solar cell performance. Efficient non‐radiative recombination may additionally lead to a significant deterioration of the solar cell‘s stability, which is an important factor for their industrialization [43,44] . The electroluminescence of the solar cells prepared at different ambient temperatures was measured and is reported in Figure 7.…”

Progress of Perovskite Solar Modules

“…[ 119 ] Furthermore, alcohols (e.g., isobutyl alcohol, n ‐butanol, n ‐propanol, and ethanol) were also tried as anti‐solvent in spite of concern about decomposition induced by alcohols. [ 120–122 ] The improved performance was monitored when the mixture of ethanol and chlorobenzene (1:3) was used as the anti‐solvent. [ 121 ] On the other hand, the perovskite precursor‐coated substrate bathing in n‐butyl alcohol resulted in a notable PCE of 17.67% and 13.85% from 0.16 cm 2 ‐sized PSC and 100 cm 2 ‐sized PSM, respectively, owing to the reduced defects.…”