The electrical transport properties of CsPbBr₃ were investigated under pressure by in-situ alternative current (AC) impedance spectroscopy and photocurrent measurements. In this work, we select CsPbBr₃, ReS₂, and black arsenic (bAs) as the research objects, which are representative of perovskite and two-dimensional materials. Pressure is an important means which can alter the geometric and electronic structures of the materials, thereby changing the electrical transport and photoelectric properties of the materials. Perovskite solar cell materials and two-dimensional layered materials have attracted worldwide attention as solar harvesting materials because of their remarkable photovoltaic properties. The use of a solid hole conductor dramatically improved the device stability compared to (CH(3)NH(3))PbI(3) -sensitized liquid junction cells. Femto second laser studies combined with photo-induced absorption measurements showed charge separation to proceed via hole injection from the excited (CH(3)NH(3))PbI(3) NPs into the spiro-MeOTAD followed by electron transfer to the mesoscopic TiO(2) film. Illumination with standard AM-1.5 sunlight generated large photocurrents (J(SC)) exceeding 17 mA/cm(2), an open circuit photovoltage (V(OC)) of 0.888 V and a fill factor (FF) of 0.62 yielding a power conversion efficiency (PCE) of 9.7%, the highest reported to date for such cells. ![]() The perovskite NPs were produced by reaction of methylammonium iodide with PbI(2) and deposited onto a submicron-thick mesoscopic TiO(2) film, whose pores were infiltrated with the hole-conductor spiro-MeOTAD. ![]() ![]() We report on solid-state mesoscopic heterojunction solar cells employing nanoparticles (NPs) of methyl ammonium lead iodide (CH(3)NH(3))PbI(3) as light harvesters.
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