Highly Efficient and Stable Perovskite Solar Cells Enabled by Low‐Cost Industrial Organic Pigment Coating

Abstract

Surface passivation of perovskite solar cells (PSCs) using a low‐cost industrial organic pigment quinacridone (QA) is presented. The procedure involves solution processing a soluble derivative of QA, N,N‐bis(tert‐butyloxycarbonyl)‐quinacridone (TBOC‐QA), followed by thermal annealing to convert TBOC‐QA into insoluble QA. With halide perovskite thin films coated by QA, PSCs based on methylammonium lead iodide (MAPbI3) showed significantly improved performance with remarkable stability. A PCE of 21.1 % was achieved, which is much higher than 18.9 % recorded for the unmodified devices. The QA coating with exceptional insolubility and hydrophobicity also led to greatly enhanced contact angle from 35.6° for the pristine MAPbI3 thin films to 77.2° for QA coated MAPbI3 thin films. The stability of QA passivated MAPbI3 perovskite thin films and PSCs were significantly enhanced, retaining about 90 % of the initial efficiencies after more than 1000 hours storage under ambient conditions.

Phase Control of Cs‐Pb‐Br Derivatives to Suppress 0D Cs4PbBr6 for High‐Efficiency and Stable All‐Inorganic CsPbBr3 Perovskite Solar Cells

“…[42][43][44] Furthermore, the slightly increased ideality factor under short-circuit condition and reduced ideality factor under open-circuit condition for bi-molecular radiative recombination and defect-assisted non-radiative recombination (Figure S20, Supporting Information) derived from the relationship between J SC /V OC and light intensity demonstrate that there is a passivation effect on perovskite surface upon introduction of ReSe 2 . [45] As expected, the defect state density (N t ) is reduced and hole mobility (μ h ) is enlarged for the film with ReSe 2 by recording dark J-V curves with space-charge-limited-current (SCLC) method and Mott-Gurney's square law (Figure S21 and Table S6, Supporting Information), [46,47] which can be cross-checked by the X-ray photoelectron spectroscopy (XPS) spectra in Figure S22, Supporting Information, and the significantly reduced dark current density (Figure S23, Supporting Information). The detailed explanation can be found in the Supporting Information.…”

Deeper Insight into the Role of Organic Ammonium Cations in Reducing Surface Defects of the Perovskite Film

“…These results indicate the suppressed charge recombination at the interface of the ex-PbI 2 -based PSCs treated with the BAI, complying well with the lowered defects and the formed type I band alignment induced by the dispersed PbI 2 layer. [16,47] Therefore, the perovskite/BAI (ex-PbI 2 )-based PSCs offer improved photovoltaic parameters and stability. [43] According to the above results, we propose a new mechanism to get deeper insight into the role of OAS in improving the PSC performance.…”

Recent Progress of Critical Interface Engineering for Highly Efficient and Stable Perovskite Solar Cells

“…[ 224 ] Finally, molecular dyes have recently attracted extensive interests and have been applied in different types of solar cell (organic solar cell, dye sensitized solar cell and PSCs) and at various interfaces of PSCs, due to their facile synthesis process, intense absorption and emission in the visible and near‐infrared region, and stable photochemical properties under humidity and heat. [ 66,225–228 ] Especially, squaraine dyes with a reasonable‐stabilized zwitterionic structure, can passivate both deep defects of and shallow defects on the surface of perovskite, are promising passivator candidates for application in PSCs. [ 169,171 ] The evaluation for interface materials should be more strict and practical, in accord with International Electrotechnical Commission (IEC) standards (IEC 61 215 and IEC 61 646) for commercial terrestrial and thin film photovoltaic (PV) modules and follow the International Summit on Organic PV Stability (ISOS) protocols.…”

“…[ 224 ] Finally, molecular dyes have recently attracted extensive interests and have been applied in different types of solar cell (organic solar cell, dye sensitized solar cell and PSCs) and at various interfaces of PSCs, due to their facile synthesis process, intense absorption and emission in the visible and near‐infrared region, and stable photochemical properties under humidity and heat. [ 66,225–228 ] Especially, squaraine dyes with a reasonable‐stabilized zwitterionic structure, can passivate both deep defects of and shallow defects on the surface of perovskite, are promising passivator candidates for application in PSCs. [ 169,171 ]…”