Bifunctional Dimethyldichlorosilane Assisted Air‐Processed Perovskite Solar Cell with Enhanced Stability and Low Voltage Loss

Abstract

The organic-inorganic halide hybrid perovskite solar cells (PSCs) constitute the most promising next-generation photovoltaics since, over the period of a decade, the power conversion efficiency (PCE) record increased from 9.7% to 25.7%. [1] The outstanding optoelectronics property of perovskite material benefits from its tunable bandgap energy, [2] high-light-absorption coefficient, [3] longcarrier-diffusion length, and high carrier mobility, [4] etc. Although perovskite materials possess an advantage in defect tolerance, the potential remains for development between practical efficiency values and theoretical PCE exceeding 30%. [5] In general terms, high-quality perovskite films are sensitive to moisture and require fabrication under an inert gas environment or at ambient featuring low humidity. Additionally, water erosion results in the degradation of perovskite and the formation of defects induced by ionic vacancy, especially at the grain boundaries and interfaces of the perovskite. [6] During the nucleation and growth of perovskite grains, defect-induced non-radiative recombination is inevitable. It has been reported that the trap density in polycrystalline perovskite films is about 10 15 % 10 17 cm À3 , while that is 10 11 %10 14 cm À3 in single-crystal perovskites. [7] This indicates that the defects are predominantly concentrated at grain boundaries and surfaces of perovskite films. Therefore, enhancing crystallization, enlarging crystal

Silane Doping for Efficient Flexible Perovskite Solar Cells with Improved Defect Passivation and Device Stability

“…37,38 The introduction of silane polymers can not only passivate the defects but also alleviate water erosion by the hydrophobic polymers formed via hydrolysis and condensation reaction at the grain boundaries. Zhou et al 39 self-polymerized with water in air to form a hydrophobic polymer, and the maximum efficiency of the corresponding device prepared in air could be achieved over 19%. 40 3-Aminopropyl triethoxysilane (APTES), a small molecule siloxane with an amino group, was introduced to modify the quantum dots distributed into the perovskite layer, which was also confirmed to promote the nucleation of perovskite, passivation defects, and the humidity stability of the device.…”

“…In addition, the erosion of water on perovskite should not be ignored. , The introduction of silane polymers can not only passivate the defects but also alleviate water erosion by the hydrophobic polymers formed via hydrolysis and condensation reaction at the grain boundaries. Zhou et al chose dimethyldichlorosilane as an additive to passivate the defects and inhibit the erosion of water; the efficiency of the unencapsulated device remained at about 80% of the initial efficiency for 1000 h at an ambient humidity of 40%. Dimethyldichlorosilane could be self-polymerized with water in air to form a hydrophobic polymer, and the maximum efficiency of the corresponding device prepared in air could be achieved over 19% .…”

Air-processed MAPbI3 perovskite solar cells achieve 20.87% efficiency and excellent bending resistance enabled via a polymer dual-passivation strategy

“…This simple, cheap and environmentally friendly strategy offers a prospective approach for promoting the wide-range of application of PSCs. 22,23…”