Surface Modification in CsPbSnIBr Inorganic Perovskite Solar Cells: Effects of Bifunctional Dipolar Molecules on Photovoltaic Performance.

Inorganic tin-lead binary perovskites have piqued the interest of researchers as effective absorbers for thermally stable solar cells. However, the nonradiative recombination originating from the surface undercoordinated Sn cations and the energetic offsets between different layers cause an excessive energy loss and deteriorate the perovskite device's performance. In this study, we investigated two thioamide derivatives that differ only in the polar part connected to their common benzene ring, namely, benzenecarbothioamide and 4-fluorophenylcarbothioamide (F-TBA).

Single-Crystal Nanowire Cesium Tin Triiodide Perovskite Solar Cell.

This work reports for the first time a highly efficient single-crystal cesium tin triiodide (CsSnI ) perovskite nanowire solar cell. With a perfect lattice structure, low carrier trap density (≈5 × 10 cm ), long carrier lifetime (46.7 ns), and excellent carrier mobility (>600 cm V s ), single-crystal CsSnI perovskite nanowires enable a very attractive feature for flexible perovskite photovoltaics to power active micro-scale electronic devices.

Fabrication of High-Quality CsPbI Perovskite Films with Phosphorus Pentachloride Additive for Highly Stable Solar Cells.

Fully inorganic perovskite cesium lead triiodide (CsPbI ) has garnered much attention from researcher for photovoltaic application because of its excellent thermal stability compared with the inorganic-organic hybrid counterparts, along with the potential to serve as the top cell in tandem devices with silicon solar cell. However, the active α-phase cubic CsPbI spontaneously tends to transform into the non-perovskite δ-CsPbI when subjected to ambient condition. This work proposes an effective method to fabricate high-quality and stable α-phase cubic CsPbI films by introducing phosphorus pentachloride (PCl ) as an additive.

Controlling Quantum-Well Width Distribution and Crystal Orientation in Two-Dimensional Tin Halide Perovskites via a Strong Interlayer Electrostatic Interaction.

Two-dimensional (2D) tin halide perovskites have recently emerged as very promising materials for eco-friendly lead-free photovoltaic devices. However, the fine control of the bulky organic cations orderly embedding into the perovskite structure with a narrow quantum-well width distribution and favorable orientation is rather complicated. In this study, we proposed to introduce the F-substituted phenylethlammonium (PEA) cation (, 4-fluorophenethylammonium FPEA) in 2D tin halide perovskite, which may mitigate phase polydispersity and crystal orientation, thus potentially increasing attainable charge-carrier mobility.

Efficient and Stable Large-Area Perovskite Solar Cells with Inorganic Perovskite/Carbon Quantum Dot-Graded Heterojunction.

This work reports on a compositionally graded heterojunction for photovoltaic application by cooperating fluorine-doped carbon quantum dots (FCQDs in short) into the CsPbIBr inorganic perovskite layer. Using this CsPbIBr/FCQDs graded heterojunction in conjunction with low-temperature-processed carbon electrode, a power conversion efficiency of 13.53% for 1 cm all-inorganic perovskite solar cell can be achieved at AM 1.