Methylammonium Chloride Induces Intermediate Phase Stabilization for Efficient Perovskite Solar Cells

Abstract

Kim and co-workers report systematical studies with methylammonium chloride (MACl) in formamidinium lead iodide (FAPbI 3 )-based perovskite thin films. The MACl addition could induce the intermediate phase with pure a-phase without annealing, effectively stabilizing the structure, only through cationic site substitution. The film quality can be significantly improved, exhibiting a 63 increase in grain size, a 33 increase in phase crystallinity, and a 4.33 increase in photoluminescence lifetime. The resulting optimized solar cells achieved a peakscan efficiency of above 24%.

Alkyl‐Chain‐Regulated Charge Transfer in Fluorescent Inorganic CsPbBr3 Perovskite Solar Cells

“…The laboratory‐scale organometallic halide perovskite solar cells (PSCs) have achieved a power conversion efficiency (PCE) as high as 25.2 %, which is comparable to those of state‐of‐the‐art silicon or thin‐film photovoltaics . However, the notorious long‐term instability is still a great burden for their commercialization under realistic operation conditions .…”

Extrinsic Ion Distribution Induced Field Effect in CsPbIBr2 Perovskite Solar Cells

“…State‐of‐the‐art metal halide perovskite solar cells (PSCs) have attained tremendous achievements with increasing power conversion efficiency (PCE) from 3.8% to 25.2% in just a few years, and its commercialization process has already started. [ 1–4 ] However, big challenges still need to be resolved to improve the unfavorable long‐term stability. For example, thermal instability in organic–inorganic hybrid perovskite inherited from the volatile organic cations restricts its potential commercialization.…”

Hole‐Boosted Cu(Cr,M)O2 Nanocrystals for All‐Inorganic CsPbBr3 Perovskite Solar Cells

“…Obviously,t he improvement of device efficiencyi sm ainly attributed to the significantly enhanced V oc and FF up to 1.602 Vand 83.4 %for Cu(Cr,Ba)O 2 -containing device.Itiswell known that the V oc depends on recombination rate in perovskite film. [32] The graded energy-level alignment (Figure 2e)i sb eneficial for robust charge carrier collection. Furthermore,t he PCE is increased to 10.79 %bydoping Sm 3+ ions into CsPbBr 3 halide and using Cu(Cr,Ba)O 2 as ah ole-transporting material (Supporting Information, Figure S12).…”