How Important Is the Organic Part of Lead Halide Perovskite Photovoltaic Cells? Efficient CsPbBr₃ Cells

Abstract

Hybrid organic-inorganic lead halide perovskite photovoltaic cells have already surpassed 20% conversion efficiency in the few years that they have been seriously studied. However, many fundamental questions still remain unanswered as to why they are so good. One of these is "Is the organic cation really necessary to obtain high quality cells?" In this study, we show that an all-inorganic version of the lead bromide perovskite material works equally well as the organic one, in particular generating the high open circuit voltages that are an important feature of these cells.

Design of Lead-Free Inorganic Halide Perovskites for Solar Cells via Cation-Transmutation

“…2,[39][40][41] Contrast to the organicinorganic hybrid perovskites, purely inorganic CsPbX VII 3 perovskites exhibit excellent thermal stability. 3,38 Secondly, because the upper group-IVA elements such as Sn and Ge at the M IV site tend to be oxidized from divalent Sn 2+ /Ge 2+ to tetravalent Sn 4+ /Ge 4+ , 32,[42][43][44] and thus cause the instability issue, current halide perovskite based solar cells with high PCEs exclusively contain the toxic element -Pb. This will inevitably cause potential environmental concerns for large-scale solar cell devices.…”

Sequential deposition method fabricating carbonbased fully-inorganic perovskite solar cells

“…Fortunately, inorganic cesium lead halides, CsPbX 3 (X=Cl, Br, I) show prominent compositional stability under thermal stress and remarkable photoelectric features with high electron mobility up to~1000 cm 2 V -1 s -1 [16]. In 2015, the first inorganic CsPbBr 3 perovskite solar cells (PSCs) were reported by Kulbak et al [17], acquiring a PCE of about 5%. More recently, Liao et al [18] reported CsPbX 3 nanowires stable solar cells with PCE of 1.21% and stability around 5500 h. Liang et al [19] reported carbon-based CsPbBr 3 solar cells with a PCE of 6.7% and stability over three months in humid air (90%-95% relative humidity, 25°C).…”

Highly Luminescent Colloidal Nanoplates of Perovskite Cesium Lead Halide and Their Oriented Assemblies

“…NPLs with thickness of only a few integer number of perovskite unit cells (1)(2)(3)(4)(5), present clear quantum size effects. We demonstrated emissions covering the entire visible spectrum and self-assembly of NPLs into higher order hierarchies.…”