A micron-scale laminar MAPbBr₃ single crystal for an efficient and stable perovskite solar cell

Abstract

Nowadays, obtaining a thin and large-area perovskite single-crystal (SC) is still challenging. Herein, we report a novel strategy to prepare a laminar MAPbBr SC with a controllable thickness of 16 μm and a size of 6 × 8 mm. Additionally, the SC solar cell achieves an intriguing efficiency of 7.11% with an impressive stability, maintaining 93% initial PCE after aging for 1000 h.

Seeded Space‐Limited Crystallization of CH3NH3PbI3 Single‐Crystal Plates for Perovskite Solar Cells

“…A very long electron diffusion length, greater than 175 µm, has been reported for a CH 3 NH 3 PbI 3 single crystal (SC); [7] it decreases to ≈100 nm in polycrystalline films, due to these traps. [7,[9][10][11][12][13][14][15][16][17][18] In addition to solar cells, high-performance photodetectors [14][15][16][17] and X-ray detectors [18] featuring perovskite SCs have also been demonstrated. Indeed, SC perovskitebased electronic devices have attracted much attention recently.…”

“…Perovskite SCs also exhibit greater thermostability and humidity stability when compared with their thin films. [11,12,16] For example, CH 3 NH 3 PbBr 3 SCs having thicknesses ranging from one to several tens of micrometers and lateral dimensions of up to several millimeters have been grown using cavitation-triggered asymmetric crystallization (CTAC), which provides additional energy to overcome the nucleation barrier; a PCE of 6.5% has been achieved for solar cells fabricated using this method. [20] The fabrication of efficient solar cells from perovskite SCs has, however, been mostly unsatisfactory, due to the imbalance between the absorption length and the carrier diffusion length; the thickness of the SCs is usually too great, resulting in poor charge carrier collection efficiencies.…”

“…[20] The fabrication of efficient solar cells from perovskite SCs has, however, been mostly unsatisfactory, due to the imbalance between the absorption length and the carrier diffusion length; the thickness of the SCs is usually too great, resulting in poor charge carrier collection efficiencies. [12] Therefore, these novel approaches can allow the preparation of perovskite SC geometries having lateral crystal structures for applications in electronic devices.The synthesis of certain perovskite single crystals (SCs), including CH 3 NH 3 PbI 3 , through asymmetric crystallization is difficult, mainly because of the large difference in solubility of the precursors and/or the intrinsic nonpreference for growth in a direction along the substrate. [10] Several methods for growing planar/thin-film perovskite SCs effectively have been demonstrated recently.…”

“…Laterally structured CH 3 NH 3 PbI 3 SC solar cells have been constructed through piezoelectric poling, but the PCEs obtained have remained low. [11,12,16] For example, CH 3 NH 3 PbBr 3 SCs having thicknesses ranging from one to several tens of micrometers and lateral dimensions of up to several millimeters have been grown using cavitation-triggered asymmetric crystallization (CTAC), which provides additional energy to overcome the nucleation barrier; a PCE of 6.5% has been achieved for solar cells fabricated using this method. [11,12,16] For example, CH 3 NH 3 PbBr 3 SCs having thicknesses ranging from one to several tens of micrometers and lateral dimensions of up to several millimeters have been grown using cavitation-triggered asymmetric crystallization (CTAC), which provides additional energy to overcome the nucleation barrier; a PCE of 6.5% has been achieved for solar cells fabricated using this method.…”

“…[11,12,16] For example, CH 3 NH 3 PbBr 3 SCs having thicknesses ranging from one to several tens of micrometers and lateral dimensions of up to several millimeters have been grown using cavitation-triggered asymmetric crystallization (CTAC), which provides additional energy to overcome the nucleation barrier; a PCE of 6.5% has been achieved for solar cells fabricated using this method. [12] Therefore, these novel approaches can allow the preparation of perovskite SC geometries having lateral crystal structures for applications in electronic devices. [12] Therefore, these novel approaches can allow the preparation of perovskite SC geometries having lateral crystal structures for applications in electronic devices.…”